Convert Weight Units
Weight Converter
Weight Conversion Chart
Quick reference for the most common weight and mass unit relationships.
Metric (SI) Mass Units
| 1 tonne (t) | = | 1,000 kg |
| 1 kg | = | 1,000 g |
| 1 g | = | 1,000 mg |
| 1 g | = | 0.001 kg |
Imperial / US Customary
| 1 stone (st) | = | 14 pounds |
| 1 pound (lb) | = | 16 ounces |
| 1 short ton | = | 2,000 lb |
| 1 long ton | = | 2,240 lb |
Cross-System (Exact Factors)
| 1 lb | = | 0.45359237 kg | exact |
| 1 oz | = | 28.349523125 g | exact |
| 1 st | = | 6.35029318 kg | exact |
| 1 short ton | = | 907.18474 kg | exact |
| 1 long ton | = | 1,016.0469088 kg | exact |
These cross-system factors are exact by definition, established by the International Yard and Pound Agreement (1959). 1 pound is defined as exactly 0.45359237 kilograms.
Weight Units by Use Case
Body Weight
Track body weight with the units your region uses. The US reports in pounds (lb), the UK uses stones and pounds (st + lb), and most other countries use kilograms (kg). Medical records worldwide increasingly use kg. 1 kg = 2.205 lb = 0.157 st.
Cooking & Baking
Recipe measurements vary by country. US recipes use ounces (oz) and pounds, while European and Asian recipes use grams (g) and kilograms. Precision matters in baking — a kitchen scale in grams gives the most consistent results. 1 oz ≈ 28.35 g (exact: 28.349523125 g).
Shipping & Logistics
Airlines and couriers use kilograms internationally (checked bag: 23 kg) and pounds in the US (50 lb). Freight uses metric tons (1,000 kg) or short tons (2,000 lb) in the US. 1 metric ton = 2,204.6 lb.
Science & Medicine
Scientific work uses the SI system: kilograms for mass, grams for smaller quantities, and milligrams for medication dosages. Drug doses are often calculated per kg of body weight. 1 kg = 1,000 g = 1,000,000 mg.
In everyday language, "weight" and "mass" are used interchangeably. Technically, the kilogram and pound measure mass. Weight is a force that depends on gravity. For conversions on Earth's surface, the distinction does not affect the result.
Popular Weight Conversions
Simple Converters
Frequently Asked Questions
What weight converters are available?
CoolConversion offers over 20 free weight converters covering all common pairs (kg to lbs, lbs to kg, stones to kg, and more), plus compound converters like Kg to Stones & Pounds and a Universal Weight Converter supporting 100+ units.
How do I convert kg to stones and pounds?
Use our Kg to Stones and Pounds converter. Simply enter the kg value, and it instantly shows the result in stones and pounds (UK weight system). For example, 75 kg = 11 stones 11 pounds.
What is the difference between metric and imperial weight systems?
The metric system uses kilograms and grams, while the imperial system (US/UK) uses pounds, ounces, and stones. 1 kg = 2.20462 pounds. The UK also uses stones (1 stone = 14 pounds = 6.35029 kg).
Can I convert between any weight units?
Yes, our Universal Weight Converter supports 100+ weight and mass units including metric (kg, g, mg, tonnes), imperial (lbs, oz, stones), US customary, and specialized units for various applications.
Conversion Charts & Tables
Printable charts and reference tables for common weight conversions:
- Kg to Lbs Conversion Table — complete reference
- Baby Weight Chart — newborn kg to lbs & oz (WHO categories)
- Body Weight Chart — adult kg to lbs (40–150 kg)
- Cooking Weight Chart — common kitchen measurements
- Luggage Weight Chart — airline baggage limits
- Lbs to Kg Table — complete 1–200 lb reference
- Kg to Stones & Pounds Table — UK body weight (20–200 kg)
- Lbs & Oz to Grams Table — cooking & baby weight (1-240 oz)
- Stones to Kg Table — UK body weight (1-30 st)
- Lbs & Oz to Kg Table — baby weight (1-320 oz)
- Lbs to Stones & Lbs Table — US→UK (1-350 lb)
- Kg to Lbs & Oz Table — baby & shipping (1-100 kg)
- Oz to Grams Table — cooking reference (1–48 oz)
Specialized Converters
Compound-unit converters with multi-unit outputs for body weight tracking, cooking, and shipping.
Compound Weight Converters
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Kg to Stones and Pounds
Converts kilograms to stones AND remaining pounds (e.g., 75 kg = 11 st 11 lbs). Essential for UK body weight.
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Kg to Lbs and Oz
Converts kilograms to pounds AND remaining ounces (e.g., 3.5 kg = 7 lbs 11 oz). Ideal for cooking and baby weight.
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Stones and Pounds to Kg
Input stones plus pounds, get kilograms (e.g., 11 st 7 lbs = 72.57 kg).
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Pounds and Ounces to Kg
Input lbs plus oz, get kilograms (e.g., 12 lbs 14 oz = 5.84 kg).
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Pounds to Stones and Lbs
Convert total pounds to stones + remaining pounds (e.g., 150 lbs = 10 st 10 lbs).
Unit-to-Unit Converters
Kilogram Conversions
Pound and Stone Conversions
Gram and Ounce Conversions
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