How to convert kilograms to pounds
lb = x × 2.2046226218487757
The international avoirdupois pound is exactly 0.45359237 kg. This is mass, not pound-force.
Worked example
lb = 70 × 2.2046226218487757
70 kg = 154.323584 lb.
Common kilogram values in pounds
Body weight, luggage limits and gym equipment are where kilograms most often need converting to pounds. The pounds-and-ounces column is what a US kitchen or bathroom scale shows.
| Kilograms | Pounds | Pounds and ounces | Typical use |
|---|---|---|---|
| 1 | 2.204623 | 2 lb 3.3 oz | Bag of flour or sugar |
| 5 | 11.023113 | 11 lb 0.4 oz | Small dumbbell |
| 20 | 44.092452 | 44 lb 1.5 oz | Olympic men's barbell |
| 23 | 50.70632 | 50 lb 11.3 oz | Common checked-bag limit |
| 50 | 110.231131 | 110 lb 3.7 oz | Adult body weight |
| 70 | 154.323584 | 154 lb 5.2 oz | Adult body weight |
| 100 | 220.462262 | 220 lb 7.4 oz | Adult body weight |
Precision and quick estimates
Because the pound is defined as exactly 0.45359237 kg, 1 kg is 2.2046226218487757 lb with no measurement uncertainty. Rounding the factor is the only source of error.
Multiplying by 2.2 reads 0.21% low: 70 kg × 2.2 = 154 lb, against 154.323584 lb exactly. That is close enough for body weight but not for shipping charges, dosing or anything billed by weight, where the full factor should be used.
A 23 kg checked-bag allowance is 50.70632 lb, slightly more than the 50 lb figure often quoted alongside it, so a bag weighed at 50.5 lb can be within one limit and over the other.
Conversion table in both directions
Values are generated by the same engine as the interactive converter.
| Input | kg → lb | lb → kg |
|---|---|---|
| 1 | 2.204623 | 0.453592 |
| 5 | 11.023113 | 2.267962 |
| 10 | 22.046226 | 4.535924 |
| 25 | 55.115566 | 11.339809 |
| 50 | 110.231131 | 22.679619 |
| 100 | 220.462262 | 45.359237 |
Unit definitions and sources
These units measure mass, not force. Metric tonnes, US short tons, UK long tons and troy ounces have distinct definitions.
| Unit and system | Use | Definition | Relationship |
|---|---|---|---|
| Kilogram (kg); si | Common units | Kilogram measures mass. kg = (value in kg) × 1. Common use: Package and material mass. | Exact definition; numerical display may be rounded |
| Pound (lb); us | Common units | Pound measures mass. kg = (value in lb) × 0.45359237. Common use: Package and material mass. | Exact definition; numerical display may be rounded |
Sources: BIPM: International System of Units; NIST: SP 811 Appendix B.8: conversion factors; NIST: 2022 CODATA recommended constants; BIPM: SI prefixes
Precision of weight and mass conversions
These 2 weight and mass units convert through Kilogram (kg). 2 have an exact defined relationship to the base unit and 0 are conventional or measured values. Results and the tables on this page come from the same engine, so a table value can be checked against the converter directly.
Standard display shows up to six decimal places, switching to scientific notation for very large or small values. Calculation uses JavaScript binary floating point independently of display rounding, so extra digits are not a claim about measurement accuracy. Each unit lists its own source; a citation records where the definition comes from, not an independent review. See Conversion methodology for the review and correction process.