Weight Conversions for Fitness: Kilograms, Pounds, Stones & More

Weight conversions are essential for fitness enthusiasts, health professionals, and anyone tracking their weight. Whether you're converting kilograms to pounds for gym equipment, understanding body weight measurements, or following international fitness programs, accurate weight conversions are crucial.

Quick Answer: Convert kilograms to pounds by multiplying by 2.2 (70 kg = 154 lbs). For gym weights, remember: a standard Olympic bar is 45 lbs (20 kg), and 45 lb plates ≈ 20 kg plates. Use our weight converter for precise fitness tracking.

This comprehensive guide covers all weight conversions you'll need for fitness and health, with practical examples and conversion tables.

Understanding Weight Units

Kilograms (kg)

Kilograms is the standard weight unit in most countries, used for:

• International fitness programs
• European gym equipment
• Scientific measurements
• Medical records (outside US)

Common Uses:

• Body weight: 50-100+ kg
• Gym weights: 1-25 kg plates
• Barbells: 20 kg (standard Olympic bar)

Convert kilograms with our weight converter.

Pounds (lbs)

Pounds is the standard weight unit in the United States, used for:

• US fitness programs
• American gym equipment
• Body weight tracking (US)
• Commercial scales

Common Uses:

• Body weight: 100-250+ lbs
• Gym weights: 2.5-45 lb plates
• Barbells: 45 lbs (standard Olympic bar)

Convert pounds with our weight converter.

Stones (st)

Stones are used in the United Kingdom for body weight:

• 1 stone = 14 pounds = 6.35 kilograms
• Common in UK fitness discussions
• Not used in gym equipment

Common Uses:

• Body weight: 8-20+ stones
• Example: "10 stone" = 140 lbs = 63.5 kg

Convert stones with our weight converter.

Weight Conversion Formulas

Kilograms to Pounds

Formula: lbs = kg × 2.20462

Common Conversions:

• 50 kg = 110.23 lbs
• 60 kg = 132.28 lbs
• 70 kg = 154.32 lbs
• 80 kg = 176.37 lbs
• 90 kg = 198.42 lbs
• 100 kg = 220.46 lbs

Mental Math: Multiply kg by 2.2 for approximate lbs

• 70 kg × 2.2 = 154 lbs (actual: 154.32 lbs)

Convert kilograms to pounds instantly with our weight converter.

Pounds to Kilograms

Formula: kg = lbs ÷ 2.20462

Common Conversions:

• 100 lbs = 45.36 kg
• 120 lbs = 54.43 kg
• 140 lbs = 63.50 kg
• 160 lbs = 72.57 kg
• 180 lbs = 81.65 kg
• 200 lbs = 90.72 kg

Mental Math: Divide lbs by 2.2 for approximate kg

• 154 lbs ÷ 2.2 = 70 kg (actual: 69.85 kg)

Convert pounds to kilograms with our weight converter.

Stones to Pounds

Formula: lbs = stones × 14

Common Conversions:

• 8 stones = 112 lbs = 50.8 kg
• 10 stones = 140 lbs = 63.5 kg
• 12 stones = 168 lbs = 76.2 kg
• 14 stones = 196 lbs = 88.9 kg
• 16 stones = 224 lbs = 101.6 kg

Use our weight converter for stone conversions.

Body Weight Conversion Tables

Common Body Weights

Kilograms	Pounds	Stones	Description
45	99	7.1	Lightweight
50	110	7.9	Lightweight
55	121	8.6	Lightweight
60	132	9.4	Average
65	143	10.2	Average
70	154	11.0	Average
75	165	11.8	Average
80	176	12.6	Above average
85	187	13.4	Above average
90	198	14.3	Heavyweight
100	220	15.7	Heavyweight

Convert any body weight with our weight converter.

Gym Equipment Conversions

Weight Plates

US Plates (pounds):

• 2.5 lbs = 1.13 kg
• 5 lbs = 2.27 kg
• 10 lbs = 4.54 kg
• 25 lbs = 11.34 kg
• 35 lbs = 15.88 kg
• 45 lbs = 20.41 kg

Metric Plates (kilograms):

• 1.25 kg = 2.76 lbs
• 2.5 kg = 5.51 lbs
• 5 kg = 11.02 lbs
• 10 kg = 22.05 lbs
• 15 kg = 33.07 lbs
• 20 kg = 44.09 lbs
• 25 kg = 55.12 lbs

Convert gym weights with our weight converter.

Barbell Weights

Standard Olympic Bar:

• US: 45 lbs = 20.41 kg
• Metric: 20 kg = 44.09 lbs

Common Total Weights:

• 135 lbs = 61.23 kg (bar + 45 lb plates)
• 185 lbs = 83.91 kg (bar + 45 + 25 lb plates)
• 225 lbs = 102.06 kg (bar + 45 lb plates each side)

Use our weight converter for barbell calculations.

Fitness Goal Conversions

Weight Loss Goals

Common Goals:

• 5 lbs = 2.27 kg
• 10 lbs = 4.54 kg
• 20 lbs = 9.07 kg
• 30 lbs = 13.61 kg
• 50 lbs = 22.68 kg

Weekly Targets:

• 1-2 lbs/week = 0.45-0.91 kg/week (healthy rate)
• 0.5-1 kg/week = 1.1-2.2 lbs/week (healthy rate)

Convert weight loss goals with our weight converter.

Muscle Gain Goals

Common Goals:

• 5-10 lbs = 2.27-4.54 kg (lean muscle, 6-12 months)
• 10-20 lbs = 4.54-9.07 kg (significant gain, 12-24 months)

Realistic Expectations:

• Beginner: 1-2 lbs/month (0.45-0.91 kg)
• Intermediate: 0.5-1 lb/month (0.23-0.45 kg)
• Advanced: 0.25-0.5 lb/month (0.11-0.23 kg)

BMI and Health Conversions

Body Mass Index (BMI)

BMI uses weight and height:

• Formula: BMI = weight (kg) ÷ height (m)²
• Or: BMI = (weight (lbs) × 703) ÷ height (inches)²

BMI Categories:

• Underweight: < 18.5
• Normal: 18.5-24.9
• Overweight: 25-29.9
• Obese: 30+

Example:

• Weight: 70 kg, Height: 1.75 m
• BMI: 70 ÷ (1.75)² = 22.9 (normal)

Use our weight converter and length converter for BMI calculations.

Weight Class Conversions (Sports)

Boxing Weight Classes

Class	Pounds	Kilograms
Flyweight	112	50.8
Bantamweight	118	53.5
Featherweight	126	57.2
Lightweight	135	61.2
Welterweight	147	66.7
Middleweight	160	72.6
Light Heavyweight	175	79.4
Heavyweight	200+	90.7+

Convert weight classes with our weight converter.

Weightlifting Classes

Men's Olympic Weightlifting:

• 61 kg (134 lbs)
• 67 kg (148 lbs)
• 73 kg (161 lbs)
• 81 kg (179 lbs)
• 96 kg (212 lbs)
• 109 kg (240 lbs)
• 109+ kg (240+ lbs)

Women's Olympic Weightlifting:

• 49 kg (108 lbs)
• 55 kg (121 lbs)
• 59 kg (130 lbs)
• 64 kg (141 lbs)
• 76 kg (168 lbs)
• 87 kg (192 lbs)
• 87+ kg (192+ lbs)

Practical Fitness Examples

Example 1: Gym Weight Conversion

Problem: US gym has 45 lb plates, European program recommends 20 kg. Equivalent?

Solution:

• 45 lbs = 20.41 kg
• 20 kg = 44.09 lbs
• Answer: Very close! Use 45 lb plates for 20 kg.

Use our weight converter to verify.

Example 2: Weight Loss Tracking

Problem: Lost 10 lbs, want to track in kg

Solution:

• 10 lbs = 4.54 kg
• Use our weight converter for tracking

Example 3: International Fitness Program

Problem: Program lists 70 kg bench press, US gym uses lbs

Solution:

• 70 kg = 154.32 lbs
• Use 155 lbs (closest available)

Health and Medical Conversions

Medication Dosages

Important: Always consult healthcare professionals for medication conversions.

General Conversions (for reference only):

• 1 kg = 2.2 lbs (for dosage calculations)
• Dosages are typically calculated per kg body weight

Pediatric Weight Conversions

Common Pediatric Weights:

• Newborn: 2.5-4.5 kg (5.5-9.9 lbs)
• 3 months: 5-7 kg (11-15.4 lbs)
• 6 months: 6.5-9 kg (14.3-19.8 lbs)
• 1 year: 8-11 kg (17.6-24.2 lbs)

Convert pediatric weights with our weight converter.

Essential Weight Conversion Tools

Use our comprehensive conversion tools:

• Weight Converter - Kilograms, pounds, stones, ounces, grams

Common Weight Conversion Mistakes

Mistake 1: Simple Multiplication

Problem: Converting 70 kg to 70 lbs by dividing by 1 Solution: 70 kg = 154.32 lbs (multiply by 2.20462)

Prevention: Always use our weight converter or the correct formula.

Mistake 2: Confusing kg and lbs

Problem: Thinking 100 kg = 100 lbs Solution: 100 kg = 220.46 lbs (more than double!)

Prevention: Use our weight converter to verify conversions.

Mistake 3: Stones Confusion

Problem: Thinking 1 stone = 10 lbs Solution: 1 stone = 14 lbs = 6.35 kg

Prevention: Use our weight converter for stone conversions.

Quick Reference Card

Essential Conversions:

• 1 kg = 2.20462 lbs
• 1 lb = 0.45359 kg
• 1 stone = 14 lbs = 6.35 kg

Common Body Weights:

• 60 kg = 132 lbs = 9.4 stones
• 70 kg = 154 lbs = 11.0 stones
• 80 kg = 176 lbs = 12.6 stones
• 90 kg = 198 lbs = 14.3 stones

Gym Weights:

• 45 lbs = 20.41 kg
• 20 kg = 44.09 lbs
• 135 lbs = 61.23 kg

Frequently Asked Questions

How do I convert my weight from kg to lbs?

Multiply your weight in kilograms by 2.2 to get pounds. For example, 70 kg × 2.2 = 154 lbs. Use our weight converter for precise tracking.

What is a healthy weight loss rate per week?

A healthy weight loss rate is 0.5-1 kg per week (1-2 lbs per week). This ensures you're losing fat rather than muscle mass.

How do I convert gym weights between kg and lbs?

Standard Olympic barbells are 20 kg (45 lbs). For plates: 20 kg = 44 lbs, 10 kg = 22 lbs, 5 kg = 11 lbs. Use our weight converter for any gym equipment conversion.

How do I convert my workout program from kg to lbs?

Multiply all weights by 2.2. For example, a 100 kg squat = 220 lbs. Use our kg to lbs converter to convert your entire program. Remember: 20 kg plates ≈ 45 lb plates.

Should I track body weight in kg or lbs?

Choose based on your location and equipment. US: use lbs. Everywhere else: use kg. What matters most is consistency. Our weight converter lets you track in both units simultaneously.

How accurate should gym weight conversions be?

Very accurate for progressive overload! Even small differences (1-2 lbs/kg) matter for tracking progress. Always use our weight converter rather than mental math for workout logs.

What's the difference between body weight and gym weight conversions?

The math is identical (1 kg = 2.20462 lbs), but context matters. For body weight, round to 0.1 lbs. For gym weights, match available plates. Use our converter for both!

Related Articles

You might also find these guides helpful:

• 10 Unit Conversion Mistakes That Could Cost You (And How to Avoid Them): Learn about the most common unit conversion errors that lead to costly mistakes in cooking, construction, travel, and more. Includes real-world examples and prevention tips.

• Area Conversions for Real Estate: Square Feet, Square Meters, Acres & More: Complete guide to area conversions for real estate. Convert square feet to square meters, acres to hectares, and understand property sizes for buying and selling.

• Construction Conversions Handbook: Essential Unit Conversions for Builders: Complete guide to construction unit conversions. Convert feet to meters, square feet to square meters, cubic yards to cubic meters, and more for construction projects.

Your Next Steps

Now that you understand these conversions, here's what to do:

1. Bookmark Our Converters (for instant access):

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Conclusion

Understanding weight conversions is essential for fitness enthusiasts, health tracking, and anyone working with international fitness programs. Whether you're converting body weight, gym equipment weights, or tracking weight loss goals, accurate conversions ensure proper tracking and progress measurement.

Key Takeaways:

• kg to lbs: Multiply by 2.20462
• lbs to kg: Divide by 2.20462
• Stones: 1 stone = 14 lbs = 6.35 kg
• Gym weights: 45 lbs ≈ 20 kg (standard Olympic bar)

Use our weight converter for accurate fitness conversions. Our converter handles kilograms, pounds, stones, and all other weight units, ensuring precise conversions for body weight tracking, gym equipment, and fitness goals!