Mass converter

Enter a mass and convert it between common metric and imperial units in either direction.

Mass to convert
Converted mass

Contents

Show the same mass in another unit

A balance holding one large weight and several smaller weights

Enter a value in either field and choose two units. The paired value updates immediately, so you can move between metric units, pounds, ounces, and stones in either direction.

Every unit passes through kilograms

The lists include milligrams, grams, kilograms, metric tonnes, avoirdupois ounces, avoirdupois pounds, and stones. The middle control swaps both units and values.

M2=M1ร—k1k2M_2=M_1\times\frac{k_1}{k_2}

Each factor k is the mass of one unit in kilograms. For example, one avoirdupois pound is exactly 0.45359237 kg, so the calculation first reaches kilograms and then divides by the target factor.

Conversions for food, luggage, and body mass

A recipe: 250 g equals 8.81849 oz. Keep a practical number of decimal places for the accuracy of the kitchen scale.

A suitcase: 23 kg equals about 50.70632 lb. Compare the unrounded result with the carrier's stated limit before packing to the boundary.

A recorded weight: 11 stone equals 69.853225 kg. The converter uses the modern stone of exactly 14 avoirdupois pounds.

Mass, force, and similar-looking ounces

The interface shows up to six decimal places. Extra displayed digits do not make the original scale reading more accurate, and an early rounded result may not return to the exact starting number.

These are units of mass. Everyday English often calls a scale reading โ€œweightโ€, but force is measured separately. The ounce here is the avoirdupois ounce used for ordinary goods, not the troy ounce used for precious metals.

Questions about mass conversion

The unit name matters as much as the number, especially for ounces and tonnes.

How many pounds are in one kilogram?

One kilogram is approximately 2.204623 avoirdupois pounds at the converter's six-decimal display.

Can I type in the converted field?

Yes. Both fields are editable, and the field changed most recently becomes the source for the other value.

Which ounce does the converter use?

It uses the avoirdupois ounce of exactly 28.349523125 grams, not the troy ounce.

How many pounds are in one stone?

One stone is exactly 14 avoirdupois pounds, equal to 6.35029318 kilograms.

Why is a result rounded?

The interface shows at most six decimal places. Round further according to the original measurement and the task.

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