Pounds to Grams Converter
Convert pounds to grams using the exact definition 1 pound = 453.59237 grams. Enter pounds and get grams, kilograms, and ounces at once.
Example: with Pounds 1 → Grams: 453.59 g.
- In kilograms0.4536 kg
- In ounces16 oz
Computed by the calculator below using its default values. Change any input to see your own numbers.
1 pound = 453.59237 grams exactly, by international agreement. Grams = pounds × 453.59237.
An exact, defined conversion
Pounds and grams are both units of mass, and the relationship between them is fixed by definition: one avoirdupois pound equals exactly 453.59237 grams. So converting is a single multiply — pounds times 453.59237 gives grams. There is no density, no temperature, and no rounding error baked into the constant itself.
One pound is 16 ounces, so an ounce is 28.349523 grams. A kilogram is 1,000 grams, which makes a pound about 0.4536 kilogram.
Where people slip up
The usual confusion is between weight (mass) and volume. Pounds and grams both weigh things, so this conversion is clean; it is only when you jump to cups, pints, or gallons that density enters. Another trap is the troy pound used for precious metals, which is lighter at about 373 grams — not the pound used here.
For food, shipping, and shop math, the avoirdupois pound in this tool is the right one.
How it’s calculated
Grams = pounds × 453.59237 (exact, avoirdupois pound). Kilograms = grams ÷ 1000; ounces = pounds × 16. One ounce equals 28.349523125 grams (NIST).
Uses the international avoirdupois pound, not the troy pound (about 373 g) used for precious metals.
Pounds to grams
| Pounds | Grams | Kilograms |
|---|---|---|
| 0.5 | 226.796 g | 0.2268 kg |
| 1 | 453.592 g | 0.4536 kg |
| 2 | 907.185 g | 0.9072 kg |
| 5 | 2,267.962 g | 2.2680 kg |
| 10 | 4,535.924 g | 4.5359 kg |
1 pound (avoirdupois) = 453.59237 grams exactly, by international agreement (NIST).
Common mistakes
- Using the troy pound (about 373 g) instead of the avoirdupois pound for everyday weights.
- Rounding the factor to 454 — the exact value is 453.59237, which matters on larger loads.
- Confusing pounds of weight with pints or cups of volume, which need density.
- Treating 16 ounces of weight as if it were 16 fluid ounces of volume.
Frequently asked questions
How many grams are in a pound?
Exactly 453.59237 grams. That figure is the international definition of the avoirdupois pound, so pounds to grams is a single multiply.
What is the formula for pounds to grams?
Grams = pounds × 453.59237. For kilograms divide the grams by 1,000, and for ounces multiply the pounds by 16.
How many grams is 5 pounds?
About 2,267.96 grams, or 2.268 kilograms. Multiply 5 by 453.59237 to get the exact figure.
Is a pound always 453.6 grams?
The everyday avoirdupois pound is, at 453.59237 g. The troy pound used for gold and silver is different, about 373.24 grams, so do not use this tool for precious metals.