Time Unit Converter
Convert between different units of time duration
About Time Conversions
Convert between different units of time duration
Convert between 18 different time units including Second, Minute, Hour, Day, Week, and more. Our free online converter provides instant, accurate conversions with formulas, examples, and conversion tables.
Quick Start: Time Conversions
Convert between 15+ time units instantly. Our free calculator handles everything from nanoseconds to millennia, with accurate formulas and real-time results.
Most Popular Conversions:
- Seconds to Minutes - Quick duration calculations
- Minutes to Hours - Work time tracking
- Hours to Days - Project planning
- Days to Weeks - Schedule management
- Weeks to Months - Long-term planning
- Months to Years - Annual calculations
- Years to Decades - Historical timelines
Why Time Conversion Matters
Accurate time conversion is essential across countless situations:
1. Work & Productivity
Convert between hours, days, and weeks for project timelines, billable hours, deadline calculations, and workforce planning. Essential for managers, freelancers, and consultants.
2. Scientific & Technical Applications
Precise time measurements in nanoseconds, microseconds, and milliseconds are critical for computing, physics experiments, network latency analysis, and high-speed data processing.
3. Travel & Time Zones
Understanding time differences for international travel, remote work coordination, flight durations, and global meeting scheduling across multiple time zones.
4. Age & Anniversary Calculations
Convert years to days, months to weeks, or calculate exact age in various units for birthdays, anniversaries, project milestones, and historical events.
5. Cooking & Timing
Convert between seconds, minutes, and hours for recipes, cooking times, food preparation, and kitchen timer settings to ensure perfect results.
Common Time Units Explained
SI (International System) Units
Second (s) - The base SI unit of time, defined by atomic transitions in cesium-133. Universal standard for all time measurements.
Nanosecond (ns) - One billionth of a second (10⁻⁹ s). Used in computer processors, GPS satellites, and high-speed electronics.
Microsecond (μs) - One millionth of a second (10⁻⁶ s). Important for sound wave analysis, laser pulses, and database queries.
Millisecond (ms) - One thousandth of a second (10⁻³ s). Critical for human reaction time, video frame rates, and web page load times.
Standard Calendar Units
Minute (min) - 60 seconds. Commonly used for short durations, appointments, and daily scheduling.
Hour (h) - 60 minutes or 3,600 seconds. Standard unit for work shifts, travel time, and daily activities.
Day - 24 hours or 86,400 seconds. Based on Earth's rotation, fundamental for calendars and scheduling.
Week - 7 days or 168 hours. Standard planning unit for work schedules, pay periods, and short-term goals.
Month - Approximately 30.44 days (average). Varies from 28-31 days depending on the specific month and leap years.
Year - 365 or 366 days (leap year). Earth's orbital period around the Sun, basis for all calendar systems.
Long Duration Units
Decade - 10 years. Used for generational trends, demographic studies, and historical periods.
Century - 100 years. Historical time period marker for long-term societal changes.
Millennium - 1,000 years. Used for geological, archaeological, and civilizational timescales.
Specialized Time Units
Fortnight - 14 days or 2 weeks. Traditional British time unit still used in some contexts.
Sidereal Day - 23 hours, 56 minutes, 4 seconds. Time for Earth to complete one rotation relative to distant stars.
Julian Year - Exactly 365.25 days. Used in astronomy and for defining light-years.
Time Conversion Quick Reference Tables
Small Time Units
| Unit | Seconds | Milliseconds | Microseconds |
|---|---|---|---|
| 1 second | 1 | 1,000 | 1,000,000 |
| 1 millisecond | 0.001 | 1 | 1,000 |
| 1 microsecond | 0.000001 | 0.001 | 1 |
| 1 nanosecond | 10⁻⁹ | 10⁻⁶ | 0.001 |
Common Daily Units
| Unit | Seconds | Minutes | Hours |
|---|---|---|---|
| 1 minute | 60 | 1 | 0.0167 |
| 1 hour | 3,600 | 60 | 1 |
| 1 day | 86,400 | 1,440 | 24 |
| 1 week | 604,800 | 10,080 | 168 |
Calendar Conversions
| Unit | Days | Weeks | Months (avg) | Years |
|---|---|---|---|---|
| 1 week | 7 | 1 | 0.230 | 0.0192 |
| 1 month (avg) | 30.44 | 4.35 | 1 | 0.0833 |
| 1 year | 365.25 | 52.18 | 12 | 1 |
| 1 decade | 3,652.5 | 521.8 | 120 | 10 |
Work Time Conversions
| Duration | Hours | Days (8h) | Weeks (40h) | Months (160h) |
|---|---|---|---|---|
| 1 work day | 8 | 1 | 0.2 | 0.05 |
| 1 work week | 40 | 5 | 1 | 0.25 |
| 1 work month | 160 | 20 | 4 | 1 |
| 1 work year | 2,080 | 260 | 52 | 13 |
Practical Time Conversion Examples
Work & Project Planning
Example 1: Billable Hours to Days
- Problem: You logged 127.5 billable hours on a project. How many 8-hour work days is that?
- Solution: 127.5 ÷ 8 = 15.94 work days (approximately 16 days)
- Use case: Project time tracking, client billing, resource allocation
Example 2: Project Duration in Weeks
- Problem: A project requires 480 hours of work with a team working 40 hours/week. How many weeks?
- Solution: 480 ÷ 40 = 12 weeks (3 months)
- Use case: Timeline estimation, deadline setting, sprint planning
Example 3: Annual Work Hours
- Problem: How many hours do you work in a year at 40 hours/week with 2 weeks vacation?
- Solution: 40 × 50 weeks = 2,000 hours/year
- Use case: Salary calculations, productivity analysis, capacity planning
Age & Anniversary Calculations
Example 4: Age in Days
- Problem: Someone is 30 years old. Approximately how many days have they lived?
- Solution: 30 × 365.25 = 10,958 days (accounting for leap years)
- Use case: Birthday celebrations, milestone tracking, life planning
Example 5: Relationship Anniversary
- Problem: You've been together for 1,000 days. How many years and months is that?
- Solution: 1,000 ÷ 365.25 = 2.74 years (approximately 2 years, 9 months)
- Use case: Anniversary planning, milestone celebrations
Example 6: Baby Age in Weeks
- Problem: A baby is 6 months old. How many weeks is that?
- Solution: 6 × 4.35 = 26.1 weeks (approximately 26 weeks)
- Use case: Pediatric tracking, developmental milestones, parenting
Scientific & Technical Applications
Example 7: Computer Processing Time
- Problem: A CPU operation takes 2.5 nanoseconds. How many operations per second?
- Solution: 1 second ÷ 2.5×10⁻⁹ = 400 million operations/second
- Use case: Computer performance, processor speed, benchmarking
Example 8: Network Latency
- Problem: Network ping time is 45 milliseconds. What's the round-trip time in seconds?
- Solution: 45 ÷ 1,000 = 0.045 seconds (45 ms)
- Use case: Internet speed, gaming latency, server response time
Example 9: Light Travel Time
- Problem: Light takes 8 minutes 20 seconds to reach Earth from the Sun. How many seconds?
- Solution: (8 × 60) + 20 = 500 seconds
- Use case: Astronomy, space science, solar studies
Travel & Scheduling
Example 10: Flight Duration
- Problem: A flight is 7 hours 45 minutes. How many minutes total?
- Solution: (7 × 60) + 45 = 465 minutes
- Use case: Travel planning, itinerary scheduling, time zone adjustments
Example 11: Road Trip Time
- Problem: A road trip takes 18 hours. How many days is that with 8 hours driving per day?
- Solution: 18 ÷ 8 = 2.25 days (2 days, 2 hours)
- Use case: Trip planning, rest stop scheduling, vacation itineraries
Cooking & Food Preparation
Example 12: Recipe Timing
- Problem: Recipe says cook for 90 minutes. How many hours and minutes?
- Solution: 90 ÷ 60 = 1 hour 30 minutes (1.5 hours)
- Use case: Meal planning, kitchen timing, recipe conversions
Example 13: Food Safety
- Problem: Food can be left out for 2 hours maximum. How many minutes is that?
- Solution: 2 × 60 = 120 minutes
- Use case: Food safety, catering, buffet timing
Common Time Conversion Mistakes
1. Forgetting Leap Years in Long Calculations
Mistake: Using 365 days per year for multi-year calculations.
Example: Calculating 10 years as 3,650 days (365 × 10).
Correct approach: Use 365.25 days per year on average to account for leap years.
- 10 years = 3,652.5 days (not 3,650 days)
Why it matters: Error of 2.5 days over 10 years can affect project deadlines, contract terms, and age calculations.
Quick tip: For precise calculations spanning multiple years, use 365.25 or consult a calendar that accounts for specific leap years.
2. Mixing Up 12-Hour and 24-Hour Time Formats
Mistake: Confusing AM/PM with 24-hour (military) time.
Example: Converting 3:00 PM to 3:00 in 24-hour format instead of 15:00.
Correct conversion:
- 3:00 PM = 15:00 (add 12 to PM hours except for 12 PM)
- 12:00 PM = 12:00 (noon stays as 12:00)
- 12:00 AM = 00:00 (midnight is 00:00)
Why it matters: Crucial for travel bookings, international scheduling, and military/aviation contexts.
Quick tip: For PM hours (except 12), add 12. For 12 AM, use 00:00.
3. Not Accounting for Variable Month Lengths
Mistake: Assuming all months have 30 days or exactly 4 weeks.
Example: Calculating 6 months as exactly 180 days (6 × 30).
Correct approach: Average month = 30.44 days (365.25 ÷ 12).
- 6 months ≈ 182.6 days (not 180 days)
- 1 month ≈ 4.35 weeks (not 4 weeks)
Why it matters: Affects payment schedules, subscription billing, project timelines, and loan calculations.
Quick tip: For rough estimates, use 30 days; for precise calculations, use 30.44 days per month average.
4. Decimal vs. Time Format Confusion
Mistake: Mixing decimal hours (1.5 hours) with time format (1 hour 50 minutes).
Example: Thinking 1.5 hours = 1 hour 50 minutes instead of 1 hour 30 minutes.
Correct conversions:
- 1.5 hours = 1 hour 30 minutes (0.5 × 60 = 30 minutes)
- 1.75 hours = 1 hour 45 minutes (0.75 × 60 = 45 minutes)
- 2.25 hours = 2 hours 15 minutes (0.25 × 60 = 15 minutes)
Why it matters: Critical for payroll, time tracking, billing, and scheduling accuracy.
Quick tip: Multiply the decimal part by 60 to get minutes. For example, 0.8 hours = 0.8 × 60 = 48 minutes.
5. Ignoring Time Zone Differences
Mistake: Scheduling international meetings without considering time zones.
Example: Setting a 3:00 PM EST meeting for someone in Tokyo, not realizing it's 4:00 AM JST (next day).
Correct approach: Always specify time zone and verify the local time for all participants.
- 3:00 PM EST = 4:00 AM JST (next day, 13-hour difference during standard time)
- Use UTC as reference for international coordination
Why it matters: Prevents missed meetings, flight booking errors, and international communication issues.
Quick tip: Use world clock tools or "meeting time converters" for scheduling across time zones.
6. Incorrect Workday/Calendar Day Conversions
Mistake: Confusing calendar days with business/workdays.
Example: Saying "10 days delivery" and meaning 10 business days but customer expects 10 calendar days.
Correct clarification:
- 10 calendar days = 10 consecutive days (including weekends/holidays)
- 10 business days = 2 weeks (excluding weekends)
- 20 business days ≈ 1 calendar month
Why it matters: Critical for shipping estimates, project deadlines, contract terms, and customer expectations.
Quick tip: Always specify "business days" or "calendar days" to avoid confusion. 1 business week = 5 days, not 7.
Frequently Asked Questions (FAQs)
How many seconds are in a day?
There are 86,400 seconds in one day.
Calculation: 24 hours × 60 minutes/hour × 60 seconds/minute = 86,400 seconds
Practical examples:
- 1 day = 86,400 seconds
- 12 hours (half day) = 43,200 seconds
- 1 hour = 3,600 seconds
- 1 minute = 60 seconds
Why it matters: Essential for scientific calculations, computer programming (Unix timestamps), and precise time measurements.
How do I convert hours to days?
Divide the number of hours by 24 to get days.
Formula: Days = Hours ÷ 24
Common conversions:
- 24 hours = 1 day
- 48 hours = 2 days
- 72 hours = 3 days
- 168 hours = 7 days (1 week)
- 8 hours = 0.333 days (1/3 day, typical work shift)
Example: You worked 120 hours on a project.
- 120 ÷ 24 = 5 days total time
Use cases: Project planning, time tracking, shift scheduling, travel duration calculations.
What is the difference between a calendar year and a solar year?
A calendar year (365 days) is slightly shorter than a solar year (365.24219 days).
Key differences:
- Solar year: Time for Earth to orbit the Sun = 365.24219 days (365 days, 5 hours, 48 minutes, 46 seconds)
- Calendar year: Standard year = 365 days
- Leap year: Calendar year = 366 days (adds February 29)
Why leap years exist: The extra 0.24219 days per year accumulates to almost 1 full day every 4 years, so we add February 29 to keep calendars aligned with seasons.
Leap year rules:
- Year divisible by 4 → leap year
- EXCEPT if divisible by 100 → not a leap year
- EXCEPT if divisible by 400 → leap year anyway
Examples:
- 2024: Leap year (divisible by 4)
- 1900: Not a leap year (divisible by 100, not by 400)
- 2000: Leap year (divisible by 400)
How many weeks are in a year?
There are approximately 52.18 weeks in a year (or 52 weeks and 1 day in a standard year).
Exact calculation: 365.25 days ÷ 7 days/week = 52.1786 weeks
Practical breakdown:
- Standard year (365 days): 52 weeks + 1 day
- Leap year (366 days): 52 weeks + 2 days
- Average (365.25 days): 52.18 weeks
For work planning:
- 52 weeks/year is commonly used for payroll and scheduling
- 50 working weeks/year after accounting for 2 weeks vacation
- 48 working weeks/year after vacation and holidays
ISO 8601 standard: Some years have 53 ISO weeks (years starting on Thursday or leap years starting on Wednesday).
How do I convert milliseconds to seconds?
Divide the number of milliseconds by 1,000 to get seconds.
Formula: Seconds = Milliseconds ÷ 1,000
Common conversions:
- 1,000 ms = 1 second
- 500 ms = 0.5 seconds
- 100 ms = 0.1 seconds
- 10 ms = 0.01 seconds
- 1 ms = 0.001 seconds
Examples:
- Website load time: 2,450 ms = 2.45 seconds
- Video frame rate: 33.33 ms/frame = 30 frames per second
- Reaction time: 250 ms = 0.25 seconds (typical human response)
Use cases: Computer performance benchmarking, web development, gaming, scientific measurements.
What is a sidereal day vs. a solar day?
A sidereal day (23h 56m 4s) is Earth's rotation relative to distant stars, while a solar day (24h) is relative to the Sun.
Sidereal day: 23 hours, 56 minutes, 4.0916 seconds
- Time for Earth to rotate 360° relative to distant stars
- Used in astronomy for telescope tracking
- About 4 minutes shorter than a solar day
Solar day: 24 hours (exactly)
- Time between two consecutive solar noons (Sun at highest point)
- Basis for our standard timekeeping (clocks and calendars)
- Slightly longer because Earth moves along its orbit
Why the difference? As Earth rotates, it also moves along its orbit around the Sun. After one full rotation (sidereal day), Earth must rotate about 1° more for the Sun to return to the same position in the sky.
Analogy: Imagine walking around a merry-go-round while it spins. You complete one full spin relative to the outside world (sidereal), but need to walk a bit further to face the same direction relative to a fixed point on the ride (solar).
Practical impact: Astronomers use sidereal time to track star positions. One sidereal day earlier each solar day, so stars rise about 4 minutes earlier each night.
How many hours are in a work year?
A standard full-time work year is approximately 2,080 hours (52 weeks × 40 hours/week).
Common calculations:
- Full-time (40 hours/week): 2,080 hours/year
- With 2 weeks vacation: 2,000 hours/year (50 weeks × 40 hours)
- With vacation + holidays: 1,960 hours/year (49 weeks × 40 hours)
Breakdown:
- Weekly hours: 40 (standard full-time)
- Work weeks per year: 52
- Total: 52 × 40 = 2,080 hours
Part-time equivalents:
- 30 hours/week: 1,560 hours/year
- 20 hours/week: 1,040 hours/year (half-time)
Use cases:
- Salary to hourly rate conversions ($50,000/year ÷ 2,080 hours = $24.04/hour)
- Annual leave calculations
- Contractor vs. employee cost comparisons
- Project resource planning
International variations: Many countries have different standard work hours (35-48 hours/week) and mandatory vacation days (20-30 days/year).
How do I calculate age in different time units?
Multiply your age in years by the appropriate conversion factor.
Conversion factors from years:
- Days: Age × 365.25 = days (accounts for leap years)
- Weeks: Age × 52.18 = weeks
- Months: Age × 12 = months
- Hours: Age × 8,766 = hours (365.25 × 24)
- Minutes: Age × 525,960 = minutes
- Seconds: Age × 31,557,600 = seconds
Example: 30 years old
- 10,958 days (30 × 365.25)
- 1,565 weeks (30 × 52.18)
- 360 months (30 × 12)
- 262,980 hours (30 × 8,766)
- 15,778,800 minutes (30 × 525,960)
- 946,728,000 seconds (30 × 31,557,600)
Use cases: Birthday celebrations, milestone tracking, life expectancy calculations, social media fun facts.
Quick online calculators: Many websites offer precise age calculators that account for exact birthdate, leap years, and even time zones.
What is Unix time (epoch time)?
Unix time is the number of seconds since January 1, 1970, 00:00:00 UTC (the "Unix epoch").
Definition: A system for tracking time used by computers, counting seconds from the Unix epoch.
Key characteristics:
- Epoch start: January 1, 1970, 00:00:00 UTC
- Format: Usually a 32-bit or 64-bit integer
- No time zones: Always referenced to UTC
Example timestamps:
- 0 = January 1, 1970, 00:00:00 UTC
- 1,000,000,000 = September 9, 2001, 01:46:40 UTC
- 1,700,000,000 = November 14, 2023, 22:13:20 UTC
- 2,147,483,647 = January 19, 2038, 03:14:07 UTC (32-bit limit)
The Year 2038 Problem: 32-bit Unix timestamps will overflow on January 19, 2038, at 03:14:07 UTC, potentially causing issues in older systems (similar to Y2K). Modern systems use 64-bit timestamps, which won't overflow for billions of years.
Use cases: Database timestamps, programming, file systems, API responses, logging systems.
Conversion: Many online tools and programming libraries can convert Unix timestamps to human-readable dates and vice versa.
How long is a fortnight?
A fortnight is 14 days or 2 weeks.
Origin: From Old English "fēowertīene niht" meaning "fourteen nights."
Conversions:
- 1 fortnight = 14 days
- 1 fortnight = 2 weeks
- 1 fortnight = 336 hours
- 1 fortnight = 20,160 minutes
Current usage:
- United Kingdom & Commonwealth: Still commonly used in everyday speech
- Australia/New Zealand: Frequently used for pay periods (fortnightly pay)
- United States: Rarely used in modern American English
- Business: Some rental agreements, subscription billing cycles
Examples:
- "I'll see you in a fortnight" = "I'll see you in 2 weeks"
- "Fortnightly pay" = Paid every 2 weeks (26 pay periods per year)
- "Fortnightly magazine" = Published every 2 weeks
Fun fact: The video game "Fortnite" is a play on this word, originally referring to the game's "Save the World" mode where players had to survive for 14 days.
How do time zones affect time conversions?
Time zones complicate conversions because clock time varies by location, even though duration remains constant.
Key concepts:
1. Duration vs. Clock Time
- Duration: Always the same (2 hours is always 120 minutes, regardless of location)
- Clock time: Varies by time zone (3:00 PM in New York ≠ 3:00 PM in London)
2. Time Zone Offsets
- UTC (Coordinated Universal Time): Reference point (UTC±0)
- EST (Eastern Standard Time): UTC-5
- PST (Pacific Standard Time): UTC-8
- CET (Central European Time): UTC+1
- JST (Japan Standard Time): UTC+9
3. Daylight Saving Time (DST)
- Adds complexity with seasonal time changes
- Not all countries/regions observe DST
- Can shift offset by 1 hour (e.g., EST becomes EDT at UTC-4)
Example conversion:
- 3:00 PM EST (UTC-5) = 8:00 PM UTC = 9:00 PM CET (UTC+1) = 5:00 AM JST (next day, UTC+9)
Best practices:
- Always specify time zone when scheduling
- Use UTC for international coordination
- Account for DST when applicable
- Use online time zone converters for accuracy
Travel tip: When crossing time zones, local clock time changes but your duration of travel stays the same. A 5-hour flight takes 5 hours, but you may "gain" or "lose" hours on the clock.
How do I convert between work hours and calendar time?
Calculate work hours based on a standard work schedule, then convert to calendar time accounting for non-working hours.
Standard work schedule:
- 8 hours/day (typical workday)
- 40 hours/week (5 days × 8 hours)
- 160 hours/month (4 weeks × 40 hours)
- 2,080 hours/year (52 weeks × 40 hours)
Conversion examples:
Work hours → Calendar days:
- 80 work hours ÷ 8 hours/day = 10 work days
- 10 work days = 2 calendar weeks (including weekends)
Calendar days → Work hours:
- 30 calendar days ≈ 22 work days (excluding weekends = 8 weekend days)
- 22 work days × 8 hours = 176 work hours
Project planning example:
- Task requires 120 work hours
- 120 ÷ 40 = 3 work weeks
- 3 work weeks = 21 calendar days (3 weeks including weekends)
Important considerations:
- Weekends: Remove Saturday and Sunday (2 days per week)
- Holidays: Deduct public holidays (varies by country, typically 10-15 days/year)
- Vacation/PTO: Account for team member time off
- Part-time workers: Adjust based on actual hours worked per week
Quick formula for work days → calendar days:
- Work days × 1.4 ≈ Calendar days (accounts for weekends)
- Example: 10 work days × 1.4 = 14 calendar days
How many minutes are in a week?
There are 10,080 minutes in one week.
Calculation: 7 days × 24 hours/day × 60 minutes/hour = 10,080 minutes
Breakdown:
- 1 week = 7 days
- 1 week = 168 hours (7 × 24)
- 1 week = 10,080 minutes (168 × 60)
- 1 week = 604,800 seconds (10,080 × 60)
Work week (5 days):
- 5 work days = 7,200 minutes (5 × 24 × 60)
- 40 work hours = 2,400 minutes (40 × 60)
Practical uses:
- Time management: Allocating minutes across weekly activities
- Fitness tracking: Total workout minutes per week
- Screen time: Monitoring weekly phone/computer usage
- Study planning: Scheduling study time (e.g., 300 minutes/week for a course)
Example: Recommended 150 minutes of moderate exercise per week = 2.5 hours = 0.015 of your total weekly minutes (1.5% of your week).
What are leap seconds and why do they exist?
Leap seconds are one-second adjustments added to Coordinated Universal Time (UTC) to keep atomic time synchronized with Earth's rotation.
Why they're needed:
- Atomic clocks: Extremely precise, define the "second" based on cesium atoms
- Earth's rotation: Gradually slowing down (not perfectly uniform)
- Result: Atomic time (TAI) drifts ahead of solar time (UT1) by about 1 second every 1-2 years
How they work:
- A leap second is inserted (or theoretically removed) to keep UTC within 0.9 seconds of UT1
- Usually added on June 30 or December 31 at 23:59:60 UTC
- Creates a 61-second minute instead of the usual 60 seconds
Leap second timeline:
- First leap second: June 30, 1972
- Most recent: December 31, 2016
- Total added: 27 leap seconds (as of 2024)
- Next leap second: TBD (announced by IERS ~6 months in advance)
Controversies & challenges:
- Computer systems: Struggle with 61-second minutes, can cause software bugs
- Financial trading: Critical timestamp precision issues
- GPS systems: Don't use leap seconds (run 18 seconds ahead of UTC as of 2024)
Proposed change: Some advocate replacing leap seconds with "leap hours" every few centuries, but no consensus yet.
Impact on daily life: Minimal for most people, but critical for precise scientific, financial, and telecommunications systems.
How do I calculate project timelines with different time units?
Break the project into tasks, estimate each in appropriate units, then aggregate and convert.
Step-by-step process:
1. Identify tasks and estimate duration
- Choose appropriate units for each task (hours, days, weeks)
- Account for task dependencies and parallel work
2. Convert to common unit (usually hours)
- Small tasks: Estimate in hours
- Medium tasks: Days → hours (× 8 for work days)
- Large phases: Weeks → hours (× 40 for work weeks)
3. Add buffer time (risk management)
- Add 10-20% for unknown issues
- Consider team availability and skill levels
4. Convert final timeline to desired format
- Client-facing: Convert to weeks or months
- Internal tracking: Keep in hours or days
Example project:
| Task | Estimate | Hours |
|---|---|---|
| Requirements gathering | 1 week | 40 |
| Design | 3 days | 24 |
| Development | 120 hours | 120 |
| Testing | 2 weeks | 80 |
| Deployment | 1 day | 8 |
| Total | 272 hours | 272 |
Convert to calendar time:
- 272 hours ÷ 40 hours/week = 6.8 work weeks
- Add 20% buffer: 6.8 × 1.2 = 8.2 weeks
- Round up: 9 weeks (or ~2 months)
Tools: Use project management software (Jira, Asana, MS Project) for automatic time calculations and Gantt charts.
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- Energy Converter - Power consumption over time (watts, joules)
- Temperature Converter - Historical temperature changes over time
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Popular Time Conversion Pairs
Quick access to the most commonly used time conversions:
- Seconds to Minutes - Basic time unit conversion
- Minutes to Hours - Common duration calculations
- Hours to Days - Project timeline planning
- Days to Weeks - Schedule management
- Weeks to Months - Long-term planning
- Months to Years - Annual calculations
- Years to Decades - Historical timelines
- Milliseconds to Seconds - Computer timing
- Nanoseconds to Microseconds - High-precision measurements
- Hours to Minutes - Cooking and timing
- Days to Hours - Shift scheduling
- Weeks to Days - Vacation planning
- Months to Weeks - Pregnancy tracking
- Years to Months - Age milestones
- Decades to Years - Historical periods
- Centuries to Years - Long-term history
- Minutes to Seconds - Precise timing
- Days to Months - Average monthly duration
- Seconds to Milliseconds - Computer programming
- Hours to Weeks - Work hours to time off
Popular Time Conversion Pairs
Quick access to the most commonly used time conversions:
Complete List: All Time Unit Conversions
Browse all categories →Complete alphabetical list of all time conversion pairs. Each conversion page includes formulas, examples, and conversion tables.
Frequently Asked Questions about Time/
Exactly 100 years. The word "century" comes from Latin "centum" (one hundred). Other units:
- 1 century = 100 years = 10 decades = 1,200 months = ~36,525 days
Helpful Conversion Guides
Learn more about unit conversion with our comprehensive guides. Master time conversions and explore other measurement systems: