Mass Converter
Convert mass between kilograms, grams, milligrams, micrograms, nanograms, picograms, femtograms, and attograms.
This calculator is useful when you need a quick unit check without working through each conversion factor by hand. Enter one value to compare every supported unit side by side.
Mass Converter
Enter a mass and choose its starting unit. The table converts the same amount from kilograms down to attograms.
| Unit | Symbol | Equivalence | Value |
|---|---|---|---|
| kilogram | kg | 1,000 g | 1e-6 |
| gram | g | 1 g | 0.001 |
| milligram | mg | 0.001 g | 1 |
| microgram | µg | 1e-6 g | 1000 |
| nanogram | ng | 1e-9 g | 1e6 |
| picogram | pg | 1e-12 g | 1e9 |
| femtogram | fg | 1e-15 g | 1e12 |
| attogram | ag | 1e-18 g | 1e15 |
Mass conversions across practical and laboratory scales
This converter helps when reading protocols, preparing samples, comparing instrument outputs, or moving between kilogram, gram, milligram, microgram, and smaller SI scales.
Mass converter or weight converter?
Kilograms, grams, milligrams, and micrograms are mass units. In everyday language, people often search for a weight converter when they mean these mass conversions. For the physics distinction, see Mass vs. Weight: What's the Difference?.
Example
Enter 1 milligram to see that it equals 1,000 micrograms or 1e6 nanograms.