Last updated: October 2026
Kilograms to pounds: the conversion everyone looks up
Kilograms-to-pounds is the single most searched weight conversion: luggage limits, gym plates, body weight and shipping quotes live in both systems at once. The factor 2.20462 comes from the exact international definition: 1 pound is 0.45359237 kilograms, so 1 kg = 1 ÷ 0.45359237 = 2.2046226 lb. For rough mental math, "double it and add 10%" lands within 1% (8 kg → 16 + 1.6 = 17.6).
Pounds to kilograms
Going the other way matters for medical dosing, visa/immigration forms and anywhere the metric system is the official one. The factor is exact: the pound has been defined as 0.45359237 kg since the 1959 international agreement, so lb→kg has no rounding ambiguity at the definition level — only display rounding.
Pounds and ounces: inside the imperial system
Recipes, postal scales and small parcels are where lb↔oz gets exercised daily. The one number to memorize is 16 — everything else is division or multiplication by it. Note these are avoirdupois ounces (28.3495 g); the troy ounce used for precious metals is heavier (31.1035 g), which is why "an ounce of gold" weighs more than "an ounce of flour".
Grams, milligrams and ounces
Metric↔imperial at small scale is the kitchen and the lab: ingredient weights on one side, nutrition labels and postage on the other. Metric-to-metric moves (grams to milligrams) are pure decimal shifts — 1,000× — which is why "how many mg make a gram" has the simplest possible answer. The imperial bridge, 28.3495 g per ounce, is exact by the 1959 definition.
Stone: the UK body-weight unit
Stone survives almost entirely as a body-weight unit in the UK and Ireland — bathroom scales, medical records and casual conversation ("I lost half a stone"). It is exactly 14 avoirdupois pounds, which makes it the only imperial weight unit still defined in whole pounds. The converter above handles stone in both directions alongside every metric unit.
Popular weight conversions
| Conversion | Answer |
|---|---|
| 8 kg to pounds | 17.637 lb |
| 160 kg to pounds | 352.74 lb |
| 15 kg to pounds | 33.0693 lb |
| 109 kg to pounds | 240.3 lb |
| 26 kg to pounds | 57.3202 lb |
| 60 kg to pounds | 132.28 lb |
| 10 kg to pounds | 22.0462 lb |
| 50 kg to pounds | 110.23 lb |
| 300 kg to pounds | 661.39 lb |
| 55 kg to pounds | 121.25 lb |
| 2.3 kg to pounds | 5.0706 lb |
| 1.5 kg to pounds | 3.3069 lb |
| 160 lb to kg | 72.5748 kg |
| 65 lb to kg | 29.4835 kg |
| 95 lb to kg | 43.0913 kg |
| 150 lb to kg | 68.0389 kg |
| 130 lb to kg | 58.967 kg |
| 8 lb to ounces | 128 oz |
| 5 lb to ounces | 80 oz |
| 10 lb to ounces | 160 oz |
| 1.5 lb to ounces | 24 oz |
| 2.5 lb to ounces | 40 oz |
| 1.38 lb to ounces | 22.08 oz |
| 96 oz to pounds | 6 lb |
| 80 oz to pounds | 5 lb |
| 40 oz to kg | 1.134 kg |
| 1 oz to pounds | 0.0625 lb |
| 2 lb to grams | 907.18 g |
| 30 g to ounces | 1.0582 oz |
| 450 g to kg | 0.45 kg |
| 0.75 oz to grams | 21.2621 g |
| 0.6 kg to ounces | 21.1644 oz |
| Ounces in a kilogram | 35.274 oz |
| Grams in an ounce | 28.3495 g |
| Milligrams in a gram | 1000 mg |
| Grams to milligrams | multiply by 1000 |
| 1 gram in ounces | 0.035274 oz |
| Pounds in a stone | 14 lb |
| Kilograms in a stone | 6.3503 kg |
How weight conversion works
The kilogram itself is now defined by the Planck constant — since 2019 it no longer depends on a physical prototype in Paris. And since the 1959 international agreement, the imperial weight units have been defined as exact metric fractions, so conversion has no estimation in it: convert to kilograms first, then to the target unit, and the only choice is how many decimals to display. This converter shows up to 6 decimals for small values and 2 for large ones, trimming trailing zeros.
Two traps to avoid: the troy ounce (31.1035 g) used for precious metals is heavier than the everyday avoirdupois ounce (28.3495 g) — this converter uses avoirdupois; and the ton comes in three flavors (metric tonne 1000 kg, US short ton 907.1847 kg, UK long ton 1016.05 kg) — the converter uses the metric tonne, labeled "t", so check which ton your source means.