Pounds to Grams Calculator (lbs to g)
Convert pounds (lb) to grams (g) and back using the exact international avoirdupois conversion: 1 lb = 453.59237 g. Also shows kilograms, milligrams, ounces and stones in one step.
lb
g
1 lb = 453.59237 g (exact, international avoirdupois)
- 1
Conversion factor
1 lb = 453.59237 gExact international avoirdupois definition (1959). - 2
Grams
1 × 453.59237 = 453.5924
How does this calculator work?
Pounds to grams: g = lb × 453.59237. Grams to pounds: lb = g ÷ 453.59237. The conversion is exact by definition — 1 international avoirdupois pound = 453.59237 g. From grams you also get kg (÷1000), mg (×1000), oz (÷28.350) and stones (÷6350.29).
Formula
How this is calculated
The international avoirdupois pound is defined as exactly 453.592 37 grams — a definition adopted internationally in 1959. Because the pound is an exact definition rather than a measured quantity, conversions using this factor carry no rounding error at the definition level; only floating-point arithmetic introduces any approximation.
From the pound, the ounce is derived: 1 oz = 1/16 lb = 28.349 523 125 g (also exact). The stone, used for body weight in the UK and Ireland, is 14 lb = 6.350 293 18 kg. Kilogram and milligram values follow directly by multiplying or dividing by powers of 1000.
The calculator accepts input in either direction: enter pounds to get grams, or fill in the grams field to reverse-convert back to pounds. If both fields contain values, the pounds field takes priority.
Frequently asked questions
Exactly 453.59237 grams. This is the internationally agreed definition of the avoirdupois pound, in force since 1959. Equivalently, 1 kilogram = approximately 2.204 622 622 lb.
No. The avoirdupois pound used in the US and UK is 453.59237 g. The "metric pound" (500 g) is an informal unit sometimes used in continental Europe and is not the same. This calculator uses the standard avoirdupois pound.
Convert to decimal pounds first: 2 lb 6 oz = 2 + 6/16 = 2.375 lb. Then multiply by 453.59237 to get 1077.28 g. For combined lb+oz conversions, use the Pounds and Ounces Calculator linked in related tools.
Also known as
TG we-Calculate Editorial Team. (2026). Pounds to Grams Calculator (lbs to g) [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/lbs-to-g-calculator
TG we-Calculate Editorial Team. "Pounds to Grams Calculator (lbs to g)." TG we-Calculate. 2026. https://we-calculate.com/calculator/lbs-to-g-calculator.
TG we-Calculate Editorial Team, "Pounds to Grams Calculator (lbs to g)," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/lbs-to-g-calculator
@misc{wecalculate_lbs_to_g_calculator, title = {Pounds to Grams Calculator (lbs to g)}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/lbs-to-g-calculator}}, year = {2026}, note = {TG we-Calculate} }
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