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BTU per Second to Kilocalorie per Hour Converter

Convert BTU/s to kcal/h with our free online power converter.

Quick Answer

1 BTU per Second = 907.791843 kcal/h

Formula: BTU per Second × conversion factor = Kilocalorie per Hour

Use the calculator below for instant, accurate conversions.

Our Accuracy Guarantee

All conversion formulas on UnitsConverter.io have been verified against NIST (National Institute of Standards and Technology) guidelines and international SI standards. Our calculations are accurate to 10 decimal places for standard conversions and use arbitrary precision arithmetic for astronomical units.

Last verified: February 2026Reviewed by: Sam Mathew, Software Engineer

BTU per Second to Kilocalorie per Hour Calculator

How to Use the BTU per Second to Kilocalorie per Hour Calculator:

  1. Enter the value you want to convert in the 'From' field (BTU per Second).
  2. The converted value in Kilocalorie per Hour will appear automatically in the 'To' field.
  3. Use the dropdown menus to select different units within the Power category.
  4. Click the swap button (⇌) to reverse the conversion direction.
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How to Convert BTU per Second to Kilocalorie per Hour: Step-by-Step Guide

Converting BTU per Second to Kilocalorie per Hour involves multiplying the value by a specific conversion factor, as shown in the formula below.

Formula:

kcal/h = BTU/s × 907.792

Example Calculation:

1 BTU/s = 907.791843 kcal/h

Disclaimer: For Reference Only

These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.

Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.

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What is a BTU per Second and a Kilocalorie per Hour?

1 BTU/s = 1,055.06 W = 1.055 kW = 3,600 BTU/h = 1.41 hp = 0.001055 MW

1 kcal/h = 1.163 W = 0.001163 kW = 0.00156 hp = 3.968 BTU/h = 4,184 J/h

Note: Uses food Calorie (Cal) = kilocalorie (kcal) = 1,000 small calories

Note: The BTU per Second is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Kilocalorie per Hour belongs to the imperial/US customary system.

Common Uses and Applications: BTU/s vs kcal/h

Explore the typical applications for both BTU per Second (imperial/US) and Kilocalorie per Hour (imperial/US) to understand their common contexts.

Common Uses for BTU/s

Rare Unit: Almost never used in practice. Theoretical: Engineering textbooks, conversion tables. Alternatives Preferred: MW for large systems, BTU/h for HVAC. Historical: Old power plant references (now use MW).

When to Use kcal/h

Metabolism: Basal metabolic rate (BMR), daily energy expenditure. Nutrition: Energy requirements, dietary planning. HVAC: Human body heat load in building calculations (Europe). Sports Science: Exercise energy expenditure, training zones.

Additional Unit Information

About BTU per Second (BTU/s)

How do I convert BTU/s to kW or MW?

Formula:

  • kW = BTU/s × 1.055
  • MW = BTU/s × 0.001055

Examples:

  • 100 BTU/s = 105.5 kW = 0.106 MW
  • 1,000 BTU/s = 1,055 kW = 1.055 MW
  • 10,000 BTU/s = 10,550 kW = 10.55 MW

BTU/s to kW converter → BTU/s to MW converter →

How do I convert BTU/s to BTU/h?

Formula: BTU/h = BTU/s × 3,600

Examples:

  • 1 BTU/s = 3,600 BTU/h
  • 100 BTU/s = 360,000 BTU/h
  • 1,000 BTU/s = 3,600,000 BTU/h (3.6 million BTU/h)

BTU/s to BTU/h converter →

Why not use BTU/s for power plants?

Megawatts clearer: 500 MW vs 473,900 BTU/s International standard: MW used globally Simpler calculations: Metric system easier Industry convention: All power plants rated in MW or GW

Example: Nuclear reactor

  • As MW: 1,000 MW (clear, concise)
  • As BTU/s: 947,800 BTU/s (unwieldy)
  • As BTU/h: 3.41 billion BTU/h (also unwieldy)

MW is the practical choice for large power systems.

About Kilocalorie per Hour (kcal/h)

How do I convert kcal/h to watts?

Formula: W = kcal/h × 1.163

Examples:

  • 60 kcal/h = 70 W (sleeping)
  • 100 kcal/h = 116 W (sitting)
  • 500 kcal/h = 582 W (running)
  • 1,000 kcal/h = 1,163 W = 1.16 kW

kcal/h to Watts converter →

How do I calculate my basal metabolic rate (BMR)?

Mifflin-St Jeor Equation (most accurate):

Men: BMR (kcal/day) = 10 × weight(kg) + 6.25 × height(cm) - 5 × age(years) + 5 Women: BMR (kcal/day) = 10 × weight(kg) + 6.25 × height(cm) - 5 × age(years) - 161

Convert to kcal/h: Divide by 24

Example - 30-year-old male, 80kg, 180cm:

  • BMR = (10 × 80) + (6.25 × 180) - (5 × 30) + 5 = 1,730 kcal/day
  • Hourly rate: 1,730 ÷ 24 = 72 kcal/h = 84 W

Example - 30-year-old female, 65kg, 165cm:

  • BMR = (10 × 65) + (6.25 × 165) - (5 × 30) - 161 = 1,370 kcal/day
  • Hourly rate: 1,370 ÷ 24 = 57 kcal/h = 66 W

What is the difference between kcal/h and cal/s?

kcal/h = Kilocalories per hour (large Calorie per hour) cal/s = Calories per second (small calorie per second)

Conversion: 1 cal/s = 3.6 kcal/h

Usage:

  • kcal/h: Metabolism, nutrition (aligns with daily calorie counts)
  • cal/s: Physics, thermodynamics

Example: 100W power

  • As watts: 100 W
  • As kcal/h: 86 kcal/h
  • As cal/s: 24 cal/s

How many kcal/h do I burn exercising?

MET (Metabolic Equivalent) method:

Formula: kcal/h = MET × weight(kg) × 1.05

Common MET values:

  • Sleeping: 0.9 METs
  • Sitting: 1.0 METs
  • Walking (3 mph): 3.5 METs
  • Jogging (5 mph): 8.0 METs
  • Running (7 mph): 11.5 METs
  • Cycling (moderate): 8.0 METs
  • Swimming (moderate): 8.0 METs

Example - 70kg person running at 7 mph:

  • kcal/h = 11.5 × 70 × 1.05 = 845 kcal/h = 982 W

Example - 70kg person walking at 3 mph:

  • kcal/h = 3.5 × 70 × 1.05 = 257 kcal/h = 299 W

Why does HVAC use kcal/h in some countries?

Historical: European HVAC tradition used kcal/h before SI adoption Body heat: Natural unit for human heat output (matches food calories) Transition: Many European countries now use watts Mixed practice: Some European standards still reference kcal/h

Conversion for HVAC:

  • 1 person (seated): 100 kcal/h = 116 W
  • Conference room (20 people): 2,000 kcal/h = 2,320 W = 2.32 kW
  • Gym (50 people, active): 20,000 kcal/h = 23,200 W = 23.2 kW

Modern practice: Most HVAC calculations now in watts or BTU/h.

Conversion Table: BTU per Second to Kilocalorie per Hour

BTU per Second (BTU/s)Kilocalorie per Hour (kcal/h)
0.5453.896
1907.792
1.51,361.688
21,815.584
54,538.959
109,077.918
2522,694.796
5045,389.592
10090,779.184
250226,947.961
500453,895.921
1,000907,791.843

People Also Ask

How do I convert BTU per Second to Kilocalorie per Hour?

To convert BTU per Second to Kilocalorie per Hour, enter the value in BTU per Second in the calculator above. The conversion will happen automatically. Use our free online converter for instant and accurate results. You can also visit our power converter page to convert between other units in this category.

Learn more →

What is the conversion factor from BTU per Second to Kilocalorie per Hour?

The conversion factor depends on the specific relationship between BTU per Second and Kilocalorie per Hour. You can find the exact conversion formula and factor on this page. Our calculator handles all calculations automatically. See the conversion table above for common values.

Can I convert Kilocalorie per Hour back to BTU per Second?

Yes! You can easily convert Kilocalorie per Hour back to BTU per Second by using the swap button (⇌) in the calculator above, or by visiting our Kilocalorie per Hour to BTU per Second converter page. You can also explore other power conversions on our category page.

Learn more →

What are common uses for BTU per Second and Kilocalorie per Hour?

BTU per Second and Kilocalorie per Hour are both standard units used in power measurements. They are commonly used in various applications including engineering, construction, cooking, and scientific research. Browse our power converter for more conversion options.

For more power conversion questions, visit our FAQ page or explore our conversion guides.

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Verified Against Authority Standards

All conversion formulas have been verified against international standards and authoritative sources to ensure maximum accuracy and reliability.

NIST Reference on Constants, Units and Uncertainty

National Institute of Standards and Technology — Fundamental physical constants and unit conversions

BIPM SI Units

Bureau International des Poids et Mesures — International System of Units (SI) definitions and standards

ISO 80000

International Organization for Standardization — Quantities and units international standards series

Last verified: February 19, 2026