Weight Converter: How to Convert Between Kilograms, Pounds, Ounces, and Stones Easily

Weight conversions come up more often than you might think: following a recipe that uses grams when your scale shows ounces, comparing your weight on a foreign scale, calculating shipping costs for a package, or tracking gym progress in different units. A weight converter handles all these conversions instantly — no mental math or conversion charts needed.

Use our free Weight Converter at Today Calculator for instant conversions between any weight units.

Common Weight Units and When to Use Them

Unit	Abbreviation	Common Uses
Kilogram	kg	Standard metric unit — body weight, groceries, science
Gram	g	Cooking ingredients, small packages, supplements
Milligram	mg	Medication dosages, vitamins, lab measurements
Pound	lb	US standard — body weight, shipping, produce
Ounce	oz	Cooking (US recipes), small items, precious metals
Stone	st	Body weight in UK and Ireland
Tonne (metric ton)	t	Industrial shipping, construction, vehicle weight
US Ton	ton	US heavy-weight measurement (2,000 lb)

Quick Reference Conversions

From	To	Multiply By	Example
kg	lb	2.20462	70 kg × 2.20462 = 154.32 lb
lb	kg	0.453592	154 lb × 0.453592 = 69.85 kg
kg	st	0.157473	70 kg × 0.157473 = 11.02 st
lb	oz	16	2 lb × 16 = 32 oz
oz	g	28.3495	8 oz × 28.3495 = 226.8 g
g	oz	0.035274	500 g × 0.035274 = 17.64 oz
st	lb	14	10 st × 14 = 140 lb

Real-World Weight Conversion Scenarios

Cooking and Baking

European recipes use grams; American recipes use cups and ounces. A flour measurement of 250 g converts to about 8.8 oz or 2 US cups. For precise baking, especially with bread or pastries, weighing ingredients in grams is far more accurate than volume measurements. Use the Weight Converter to convert any recipe ingredient instantly.

Travel and Luggage

Airlines often specify baggage limits in kg (most of the world) or lb (US). If your suitcase weighs 18 kg at check-in, that is about 40 lb — right at the limit for many US carriers. Packing an extra 2 kg? That is roughly 4.4 lb. The weight converter helps you stay within limits regardless of which unit your airline uses.

Fitness and Health

Gym equipment uses pounds in the US and kilograms elsewhere. A 135 lb barbell is about 61 kg. Converting your body weight between units is useful when tracking international fitness benchmarks. The BMI Calculator also handles both metric and imperial inputs.

Shipping and Mailing

Shipping carriers charge by weight. A 5 lb package costs differently domestically vs internationally (where rates use kg). 5 lb = 2.27 kg. Knowing the exact conversion prevents unexpected postage costs. For international shipments, also check the Volume Converter since dimensional weight may apply.

Common Conversion Mistakes

Mistake	Why It Is Wrong	Correct Approach
Confusing oz (weight) with fl oz (volume)	Fluid ounces measure volume, not weight	Use weight converter for weight, volume converter for liquids
Using 2.2 instead of 2.20462 for kg→lb	Small error adds up with larger weights	Use the exact conversion factor or the converter tool
Mixing up short ton (2,000 lb) and metric tonne (2,204.6 lb)	Different standard systems	Check which system your industry uses
Dividing instead of multiplying (and vice versa)	Easy to reverse the conversion factor	Use a weight converter to stay error-free

For instant, accurate conversions between any weight units, use the Weight Converter at Today Calculator. It supports kg, g, lb, oz, st, tons, and more — all in one tool.