Weight converter
Switch between metric mass units and US/UK customary weight units. Convert recipe ingredients (500 g flour to cups context via weight), shipping labels (lbs ↔ kg), and gym progress (185 lb bar to kg plates).
How to convert weight units
1. Enter the weight in the source unit.
2. Select target unit (kg, lb, oz, g, etc.).
3. Read the converted value.
4. Use grams or milligrams for small quantities like spices or medication reference.
Weight conversion examples
Body weight
180 lb = 81.65 kg. EU health forms often require kilograms.
Shipping limit
23 kg airline bag limit = 50.71 lb — check airline rounding rules separately.
Recipe
8 oz butter = 226.8 g. Weight is more accurate than volume for baking.
When to use the weight converter
• When you follow fitness or nutrition data across US and metric apps.
• When you compare product weights on international e-commerce sites.
• When you convert postal or freight limits between lb and kg.
Avoirdupois vs troy weight
Everyday pounds and ounces are avoirdupois (16 oz = 1 lb). Gold and silver use troy ounces (about 31.1 g vs 28.35 g for avoirdupois). Using the wrong ounce type misprices bullion by roughly 10%.
Frequently asked questions
How many pounds in a kilogram?
1 kg = 2.20462262185 lb. 1 lb = 0.45359237 kg exactly.
What is a stone?
1 stone = 14 pounds, used in UK for body weight (e.g. 12 st 4 lb).
Is weight the same as mass?
In everyday language yes; in physics mass is constant while weight depends on gravity. Kitchen and shipping use mass units interchangeably.
Ounces: fluid or weight?
This converter handles weight ounces (oz). Fluid ounces (fl oz) measure volume — different tool.
How precise should baking conversions be?
Grams to one decimal are usually enough. Professional recipes often specify ±1 g for dry ingredients.