lbs to Grams Converter
Convert pounds to grams for precise cooking, nutrition, and small-weight measurement.
How It Works
Formula: lbs to g = value × 453.59237
Example: 1 lbs = 453.59237 g
Note: 1 pound equals 453.592 grams under the international avoirdupois pound standard.
Common Uses
Quick Conversion Table
| lbs | g |
|---|---|
| 1 | 453.5924 |
| 5 | 2268 |
| 10 | 4536 |
| 25 | 11340 |
| 50 | 22680 |
| 100 | 45359 |
| 150 | 68039 |
| 200 | 90718 |
Rounding Rule
Rounded to 3 decimal places
Error Margin
±0.001 g
Precision Guidance
For cooking, round to whole grams. For nutrition tracking, keep 1-3 decimals.
Common Mistakes
Remember that 1 lb is 453.592 g, not 500 g. The metric approximation is close but not exact.
Frequently Asked Questions
What is 1 lb in grams?
1 pound equals 453.592 grams using the avoirdupois standard (1 lb = 453.59237 g).
How do I convert pounds to grams?
Multiply the pound value by 453.592. For example, 2 lbs × 453.592 = 907.185 g.
Is this useful for cooking?
Yes, many recipes and digital scales use grams, while US packaging lists pounds.
How accurate is this?
This uses the exact international pound definition, accurate to 3 decimal places in grams.
Deep Dive Guide
Lbs to Grams: Convert Pounds to Grams Exactly
Convert lbs to grams with the exact factor. 1 pound equals 453.59 grams. See the math, cooking uses, and a quick reference table.
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Exact Constants & Authoritative Sources
Every conversion on this page uses the fixed, internationally agreed constants below — drawn from NIST and the SI Brochure. No values are estimated or rounded as if exact. See the full list on our Sources & Standards page.
- EXACT1 pound (lb, avoirdupois) = 0.45359237 kilograms (exact)
- EXACT1 ounce (oz, avoirdupois) = 28.349523125 grams (exact, 1/16 lb)
- EXACT1 stone (st) = 6.35029318 kilograms (exact, 14 lb)
- EXACT1 short ton (US) = 907.18474 kilograms (exact, 2000 lb)
Common Pitfalls & How to Avoid Them
Mass vs. weight
The pound and kilogram are units of MASS, not force. On Earth, mass and "weight" read the same number in practice, but a 70 kg mass weighs less on the Moon. UnitFig converts mass; for scientific force you need newtons (1 lbf = 4.4482216152605 N, exact).
Avoirdupois vs. troy ounce
Cooking and body weight use the avoirdupois ounce (28.349523125 g). Gold and precious metals use the troy ounce (31.1034768 g). Never mix them — the error is about 10%.
Rounding the factor
Using 2.2 instead of the exact 2.20462262 overstates small errors at large values. For medical dosing or competition weight classes, keep the full factor or use a converter.
A unit-conversion reference site has no manufacturer-specific or device calibration parameters, so "layered tuning" does not apply here. The only real error-handling is input validation: the converter rejects non-numeric, empty, or out-of-range entries and shows a clear message, then falls back to exact constants above. No estimated or rounded figures are ever presented as exact.
Authoritative sources for this page
- NIST (U.S. National Institute of Standards and Technology) — NIST SP 330 — The International System of Units (SI), 2019 edition
Last Updated 2026 | This converter was reviewed for accuracy