Mass Unit Converter

Chemical dosing, shipping weights and analytical balances rarely agree on units: a recipe calls for grams, a datasheet for pounds, a permit for kilograms and a lab for milligrams. This converter moves exactly between metric and imperial mass with no approximation.

Convert mass unit units

Value

From

Why mass units collide

Metric mass is a clean decimal stack (tonne, kg, g, mg) while imperial mass stacks ounces, pounds and (short/long) tons on non-decimal factors. The conversion between them — 1 lb = 0.45359237 kg exactly — is a defined constant, so the converter is exact.

The only trap is the tonne vs ton ambiguity: a metric tonne is 1000 kg, but a short (US) ton is 907.185 kg and a long (UK) ton is 1016.05 kg. This tool uses the metric tonne; convert short/long tons deliberately if your spec uses them.

Which unit where

Grams and milligrams rule laboratory and dosing work; kilograms and tonnes describe bulk chemical, freight and tank contents. Pounds and ounces are the imperial language of equipment nameplates and shipping in US markets.

Complete conversion reference

Convert 1 unit to	kg	g	mg	t	lb	oz
1 kg	1	1000	1e+06	0.001	2.20462	35.274
1 g	0.001	1	1000	1e-06	0.00220462	0.035274
1 mg	1e-06	0.001	1	1e-09	2.20462e-06	3.5274e-05
1 t	1000	1e+06	1e+09	1	2204.62	35274
1 lb	0.453592	453.592	453592	0.000453592	1	16
1 oz	0.0283495	28.3495	28349.5	2.83495e-05	0.0625	1

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Frequently asked

How many grams in a pound?

Exactly 453.59237 g (0.45359237 kg). One ounce is 28.349523125 g. These are defined imperial-to-metric masses, so the converter returns exact values.

What is the difference between a tonne and a ton?

A metric tonne is 1000 kg. A US short ton is 907.185 kg and a UK long ton is 1016.05 kg. This tool uses the metric tonne; convert short or long tons deliberately if your specification uses them.

Why do labs use mg but plants use kg?

Milligrams describe analytical and dosing quantities where precision matters; kilograms and tonnes describe bulk chemical and freight. Convert at the boundary to avoid a million-fold error.

Is lb the same as kg?

No. One pound is about 0.4536 kg, so a 50 lb drum is roughly 22.68 kg. Always convert rather than reading the number as if the unit were the same.

This page performs exact unit arithmetic with no physical assumption beyond the stated reference (for example mH₂O assumes water near 4 °C, and pH follows its logarithmic definition). It is a working aid, not a substitute for the measurement method named in your permit.