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

Weight conversion is something most of us deal with daily — checking a package weight for shipping, following a recipe that uses grams when your scale reads ounces, tracking body weight in kilograms while your doctor uses pounds, or comparing product specs from different countries. Each country and industry prefers different units, making conversion a constant necessity.

Our free Weight Converter handles all common units instantly — kilograms, pounds, ounces, grams, stones, and more.

Common Weight Units and When to Use Them

Unit	Abbreviation	Common Uses	Conversion
Kilogram	kg	Most of the world (EU, Asia, Aus, SA) for body weight, groceries	Base unit
Gram	g	Cooking, scientific measurements, small items	1 kg = 1000 g
Pound	lb	USA for body weight, food, shipping	1 lb = 0.4536 kg
Ounce	oz	Cooking (USA), baby weight, small packages	1 lb = 16 oz
Stone	st	UK and Ireland for body weight	1 st = 14 lb = 6.35 kg
Metric ton	t	Industrial, shipping, large quantities	1 t = 1000 kg

Quick Conversion Reference

Kilograms	Pounds	Stones	Ounces
1 kg	2.205 lb	0.157 st	35.27 oz
5 kg	11.02 lb	0.787 st	176.4 oz
10 kg	22.05 lb	1.575 st	352.7 oz
50 kg	110.23 lb	7.874 st	1764 oz
70 kg	154.32 lb	11.02 st	2469 oz
100 kg	220.46 lb	15.75 st	3527 oz

Use our Weight Converter for precise conversions — just enter any value and unit, and it instantly converts to all other units.

How to Convert Weight Units Manually

Kilograms to Pounds

Multiply kg by 2.20462. For a quick mental estimate, multiply by 2.2. To convert 80 kg to pounds: 80 x 2.2 = 176 lb (actual: 176.37 lb).

Pounds to Kilograms

Divide pounds by 2.20462. For quick mental math, divide by 2.2. To convert 150 lb to kg: 150 / 2.2 = 68 kg (actual: 68.04 kg).

Stones to Kilograms

One stone equals 14 pounds or 6.35 kilograms. To convert 12 stone to kg: 12 x 6.35 = 76.2 kg. To convert back, divide by 6.35.

Real-World Weight Conversion Examples

Shipping a package: A 5 lb parcel = 2.27 kg. If shipping costs are per kg, that difference matters
Following a recipe: A UK recipe calls for 500 g flour. Your US measuring cup uses ounces: 500 g = 17.6 oz
Gym weight plates: European gyms use kg plates (20 kg = 44 lb). US gyms use lb plates (45 lb = 20.4 kg)
Baby weight: US hospital says 7 lb 8 oz = 3.4 kg = 0.54 stone
Luggage allowance: Airlines often list in kg (23 kg = 50.7 lb) — knowing both helps avoid overweight fees

Common Mistakes in Weight Conversion

Confusing ounces (weight) with fluid ounces (volume): They are different measurement systems entirely
Rounding too aggressively: Using 2.2 instead of 2.20462 is fine for rough estimates but can cause significant errors at scale
Mixing metric tons with UK tons or US tons: A metric ton = 1000 kg, a UK ton = 1016 kg, a US ton = 907 kg
Forgetting to convert stones and pounds together: 10 stone 7 lb is not 10.7 stone — it is 10.5 stone (7 lb = 0.5 stone)

Skip the manual calculations and potential errors — use our Weight Converter for instant, accurate results across kilograms, pounds, ounces, stones, and grams. Perfect for cooking, shipping, fitness, and travel.