kg to lbs Converter
Convert kilograms to pounds for American fitness, shipping, and international weight comparison.
How It Works
Formula: kg to lbs = value × 2.20462262
Example: 70 kg = 154.323583 lbs
Note: 1 kilogram equals 2.2046 pounds (1 kg = 2.20462262 lbs) using the international avoirdupois standard.
Common Uses
Quick Conversion Table
| kg | lbs |
|---|---|
| 1 | 2.2046 |
| 5 | 11.0231 |
| 10 | 22.0462 |
| 25 | 55.1156 |
| 50 | 110.2311 |
| 100 | 220.4623 |
| 150 | 330.6934 |
| 200 | 440.9245 |
Rounding Rule
Rounded to 4 decimal places
Error Margin
±0.0001 lbs
Precision Guidance
For everyday use, round to 1 decimal place. For shipping and medical records, keep 2-4 decimals.
Common Mistakes
Do not confuse with troy measurements used for precious metals. Body weight and shipping use the avoirdupois pound.
Frequently Asked Questions
What is 1 kg in pounds?
1 kilogram equals 2.2046 pounds using the standard conversion (1 kg = 2.20462262 lbs).
How do I convert kg to lbs?
Multiply the kilogram value by 2.2046. For example, 70 kg × 2.2046 = 154.32 lbs.
Why do US scales use pounds?
The US uses the avoirdupois pound for everyday weight. Converting kg to lbs helps Americans read international medical and fitness data.
Is this accurate for shipping?
Yes, this uses the exact kilogram-to-pound ratio recognized internationally for trade and shipping.
Deep Dive Guide
Kg to Lbs: The Complete Kilograms to Pounds Conversion Guide
Master kg to lbs conversion with the exact 2.20462262 factor. Convert any kilograms to pounds for fitness, medical, travel, and shipping use.
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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