βοΈ Weight Converter
Convert between kilograms, grams, pounds, ounces, and stone, live as you type.
Converted Weight
How to Use This Converter
Type an amount, choose the unit it is in and the unit you want, and the result updates the instant you type. No buttons required, though the Convert button works too.
Enter the amount in the Amount box, for example 150 or 68.5. Decimals work fine.
Pick the From unit: kilograms, grams, pounds, ounces, or stone.
Pick the To unit. The converted value appears immediately at the top of the results card.
Scan the all-unit table under the result to see the same amount in every other unit at a glance.
Exact Conversion Factors
The pound is defined as exactly 0.45359237 kilograms by international agreement, so pound-based conversions are exact, not rounded estimates. The ounce is one sixteenth of that pound, exactly 28.349523125 grams. The gram ties back to the kilogram (1,000 grams per kilogram), which is now defined by the Planck constant rather than a physical object. Stone is a legacy unit equal to 14 pounds. In practice, 1 kg β 2.2 lb, 1 lb β 0.45 kg, 1 oz β 28.35 g, and 1 stone β 6.35 kg are the approximations most people carry in their heads.
Worked Example
You weigh 150 pounds and a fitness app asks for kilograms. 150 x 0.45359237 = 68.0389 kg, so enter 68.04. A recipe calls for 500 grams of flour and your US kitchen scale reads ounces: 500 / 28.349523125 = 17.637 ounces, about 1.1 pounds. A friend in London says they weigh 11 stone: 11 x 14 = 154 lb, and 154 x 0.45359237 = 69.853 kg. Try all three in the converter to watch the all-unit table fill in.
Where This Comes Up
Cooking sits at the center of weight conversion: European and Australian recipes use grams, American ones use ounces and cups, and translating between them is where baking succeeds or fails. Travelers convert kilograms to pounds constantly because airline baggage limits are posted in pounds in the US and kilograms almost everywhere else. Gym goers bridge both systems, since plates are stamped in pounds but programs and apps often ask for kilograms. The stone shows up in UK and Irish body-weight conversations, and international shipping quotes flip between the two depending on the carrier.
Frequently Asked Questions
How many pounds are in 1 kg?
1 kilogram equals 2.20462 pounds. The conversion is exact at 0.45359237 kg per pound by international agreement, so dividing any kilogram value by 0.45359237 gives pounds. Going the other way, multiply pounds by 0.4536 for a quick estimate.
How many grams are in an ounce?
1 ounce equals 28.3495 grams. This is the avoirdupois ounce used for food, mail, and everyday items in the US. It is different from the troy ounce (31.1035 grams) used for precious metals, so check which one your context uses.
What is a stone in weight?
A stone is 14 pounds, or 6.35029 kilograms. It is still the everyday unit for body weight in the UK and Ireland: someone who says they weigh 11 stone weighs 154 pounds. The US does not use stone, so American scales and charts show pounds only.
How do I convert pounds to kilograms for luggage?
Multiply pounds by 0.4536. A 50-pound checked-bag limit equals 22.68 kg, and a 40-pound carry-on equals 18.14 kg. Because overweight fees are steep, weigh your bag before the airport and leave a half-pound margin under the limit.
Why does my gym plate math never work out in kg?
Standard gym plates are sized in pounds: 45 lb equals 20.41 kg, 35 lb equals 15.88 kg, 25 lb equals 11.34 kg, and 10 lb equals 4.54 kg. A pair of 45s on an Olympic bar (45 lb bar) is 135 lb total, which is 61.24 kg.