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This mass guide keeps metric and customary weight units in one place so you can verify recipes, lab notes, and shipping specs in seconds.
Mass conversions pop up in everything from baking to freight forwarding. Use the reference below to see how each unit ties back to the SI kilogram and to learn the shortcuts professionals rely on.
Jump directly to any available converter for mass converter & reference units.
Every unit below references the SI base value so you can compare readings quickly.
| Unit | Symbol | 1 unit in kg | Notes |
|---|---|---|---|
| Milligram | mg | 1 mg = 1.0000×10^-6 kg | — |
| Gram | g | 1 g = 0.001 kg | — |
| Ounce | oz | 1 oz = 0.0283495 kg | — |
| Pound | lb | 1 lb = 0.453592 kg | — |
| Kilogram | kg | Reference unit | — |
| Metric Ton | t | 1 t = 1K kg | — |
These presets mirror the quick actions available inside the SwapUnits converter.
Mass measures how much matter an object contains, while weight is the force exerted by gravity on that mass. Everyday conversions treat them similarly, but scientific calculations distinguish the two.
The International System of Units chose the kilogram as the base unit so that the derived unit for force (newton) maintains practical magnitudes in physics and engineering.
The conversion 1 ounce = 28.3495 grams is exact enough for gourmet baking and nutrition labels. For pharmaceutical precision, convert to milligrams and work with mass balances.
Head back to the SwapUnits converter to crunch numbers instantly and save your favorite presets.