Weight Converter

Convert weight and mass between milligrams, grams, kilograms, ounces, pounds, and stones instantly, with every unit shown at once.

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How to use the weight converter

Enter a value and pick the unit it is in. The converter immediately shows the equivalent in every other supported unit — milligrams, grams, kilograms, ounces, pounds, and stones — so you can read across metric and imperial at a glance. Everything runs in your browser.

Metric and imperial together

Weight conversions come up constantly: following a recipe from another country, reading a body weight in a different system, checking a shipping limit, or logging gym progress. Because this tool shows all units at once, you never have to choose a single conversion direction — change the source unit and the entire list recalculates instantly.

Exact and reliable

The conversions rest on exact international definitions: a pound is exactly 453.59237 grams, an ounce exactly 28.349523125 grams, and a stone exactly 14 pounds. That makes the results precise, with rounding appearing only in the displayed number. For very large or very small values the converter switches to scientific notation so the answer stays readable. Nothing you enter is stored.

Popular weight conversions

KG to Lbs1 kg = 2.204623 lb Lbs to KG1 lb = 0.4535924 kg Grams to Ounces1 g = 0.03527396 oz Ounces to Grams1 oz = 28.34952 g Stone to KG1 st = 6.350293 kg KG to Stone1 kg = 0.157473 st Lbs to Stone1 lb = 0.07142857 st MG to Grams1 mg = 0.001 g

Frequently Asked Questions

How do I convert kilograms to pounds?

Multiply the kilograms by 2.20462, since one kilogram equals 2.20462 pounds. So 70 kg × 2.20462 = 154.3 lb. To convert pounds to kilograms, divide by 2.20462 or multiply by 0.453592.

How many grams are in an ounce?

One ounce is exactly 28.349523125 grams. For everyday use, 28.35 g is close enough. To convert ounces to grams multiply by 28.35; to convert grams to ounces divide by 28.35.

What is a stone in kilograms?

One stone equals 14 pounds, which is about 6.35 kilograms. Stones are still commonly used for body weight in the UK and Ireland. To convert stones to kilograms, multiply by 6.35029.

What is the difference between mass and weight?

In physics, mass is the amount of matter (measured in grams or kilograms) and weight is the force of gravity on that mass. In everyday language the two are used interchangeably, and this converter follows that everyday usage — the units here all measure mass.

Are these weight conversions exact?

Yes. A pound is defined as exactly 453.59237 grams and an ounce as exactly 28.349523125 grams, so the conversions are precise. Any rounding you see is only in how the result is displayed, not in the calculation itself.