Weight Converter
Convert between metric and imperial weight units, from milligrams to tons.
1 mg =
0.001 g
How to use
- Type the value to convert — decimals are fine.
- Pick the current unit on the left and the target unit on the right. The middle button swaps direction.
- The result updates as you type. Check the conversion table and formula below, too.
Frequently asked questions
How accurate are the results?+
Calculations use the internationally standardized (SI) definitions; only the display is rounded to about six significant digits. That's plenty for everyday, school and work use.
How many pounds is a kilogram?+
1 kg ≈ 2.20462 lb. Conversely, 1 lb = exactly 0.45359237 kg by international definition.
Where is stone used?+
Mainly for body weight in the UK: 1 stone = 14 lb ≈ 6.35 kg.
Does it need a fast connection?+
No. The math runs instantly inside your browser with no server round-trip — it even works offline once the page is open.
Is it really free?+
Yes. No sign-up, no install, no usage limits. The site is ad-supported.
Unit guide
Pounds and ounces in daily life
Gym plates (pounds), recipe ingredients (ounces), newborn weights in the news (pounds and ounces), international shipping rates — weight units mix constantly. Remember 1 lb ≈ 0.45 kg and 1 oz ≈ 28 g and you can estimate on the spot.
Note: precious metals use troy ounces (31.1 g), not the avoirdupois ounce here — don't use this for gold prices.
How this converter calculates
Every unit is converted to kilograms first, then divided into the target unit. The pound (0.45359237 kg) has been an exact defined value since 1959, so the math carries no error.