KG to LBS Converter (and Every Weight Unit)

To convert kg to lbs, divide the kilograms by 0.45359237, because one pound is exactly 0.45359237 kg. That is the same as multiplying by about 2.20462. For example, 70 kg ÷ 0.45359237 = 154.32 lb, which is 154 lb 5.2 oz, or 11 stone 0.3 lb. To go from pounds to kg, multiply by 0.45359237.

How to use the weight converter

1. Type a number in the From box and pick its unit: milligrams, grams, kilograms, metric tons, ounces, pounds, pounds + ounces, stones, stones + pounds, US short tons or UK long tons.
2. Pick the unit you want in the To box. The answer appears as you type, and you can type in the To box to convert the other way.
3. For a baby’s birth weight or a body weight, choose Pounds + ounces (7 lb 8 oz) or Stones + pounds (11 st 4 lb). Fractions such as 1/2 work too.
4. Choose how many decimals you want, or leave it on Auto.
5. Open Show steps for the working, read the dual scale, and use the table for other values of the same pair.

KG to lbs formula

pounds = kilograms ÷ 0.45359237

kilograms = pounds × 0.45359237

The number 0.45359237 is the legal definition of the avoirdupois pound, the pound used for body weight, groceries and shipping. NIST Handbook 44 lists 1 pound as 453.59237 grams (exactly). Because the definition is exact, dividing by it gives the exact number of pounds; the only rounding is in how many decimals you keep.

The familiar factor 2.20462 is 1 ÷ 0.45359237 rounded, so “multiply by 2.20462” is a very close shortcut. Multiplying by 2.2 is quicker but about 0.2% low: 70 × 2.2 = 154 lb, while the exact answer is 154.32 lb.

A mental-math trick for kg to lbs: double the kilograms and add 10% of the result. For 70 kg, 2 × 70 = 140, and 140 + 14 = 154 lb. For lbs to kg, halve the pounds and take off 10%: 150 lb → 75 → 67.5 kg (the exact answer is 68.04 kg).

Pounds and ounces

A pound has 16 ounces, so the decimal part of a pound is not ounces. To split a decimal number of pounds:

1. Keep the whole number as the pounds.
2. Multiply the decimal part by 16 to get the ounces.

Example: 70 kg. 70 ÷ 0.45359237 = 154.3236 lb. The decimal part is 0.3236, and 0.3236 × 16 = 5.18 oz. So 70 kg is 154 lb 5.2 oz.

Example: a 3.2 kg newborn. 3.2 ÷ 0.45359237 = 7.0548 lb, and 0.0548 × 16 = 0.88 oz, so the baby weighs about 7 lb 0.9 oz.

Going the other way: 7 lb 8 oz. 8 oz is 8 ÷ 16 = 0.5 lb, so the weight is 7.5 lb, and 7.5 × 0.45359237 = 3.402 kg.

One ounce is exactly 1/16 of a pound, which is 28.349523125 grams.

Stones and pounds

In the UK and Ireland, body weight is often given in stones and pounds. One stone is 14 pounds, about 6.35 kg. To convert pounds to stones, divide by 14: the whole number is the stones and the remainder is the pounds.

Example: 70 kg. 154.32 lb ÷ 14 = 11 stones with 0.32 lb left over, so 70 kg is 11 st 0.3 lb.

Going the other way: 11 st 4 lb. 11 × 14 + 4 = 158 lb, and 158 × 0.45359237 = 71.67 kg.

KG to lbs chart

Weight conversion factors

Mass vs weight

In physics, mass is the amount of matter in an object and is measured in kilograms, while weight is the force of gravity on it and is measured in newtons. Your mass is the same on the Moon, but your weight there is much smaller.

In everyday life and in trade, “weight” simply means mass. NIST’s Guide to the SI notes that in commercial and everyday use, weight is usually a synonym for mass, and the kilogram is its unit. A bathroom scale or a shop scale reports mass in kilograms or pounds, and this converter works the same way. The pound here is a unit of mass, not the “pound-force” used in engineering.

Common mistakes when converting weight

• Multiplying when you should divide. A kilogram is heavier than a pound, so the number of pounds must be bigger. 70 kg is 154 lb, not 31.75 lb.
• Reading 154.32 lb as 154 lb 32 oz. The decimal is a fraction of a pound: 0.32 × 16 = 5.1 oz.
• Using 2.2 for precise work. It is 0.2% low, about 1 lb short at 220 kg. Use 0.45359237 for anything that matters.
• Mixing up tons. A US short ton is 2,000 lb, a UK long ton is 2,240 lb, and a metric ton (tonne) is 1,000 kg, about 2,205 lb.
• Confusing ounces. The weight ounce (1/16 lb) is not the fluid ounce, which measures volume, or the troy ounce used for gold.

Sources

Exact unit definitions were checked November 2026:

• NIST Handbook 44 (2026), Appendix C: General Tables of Units of Measurement
• NIST Guide to the SI (SP 811), Appendix B.9: Factors for units listed by kind of quantity
• NIST Guide to the SI, Chapter 8 (section 8.3 on weight and mass)

KG to lbs practice quiz: 10 questions

Test yourself with 10 multiple-choice questions. Choose an answer and press Submit to see if you are right and why. Your score appears at the end.

Frequently asked questions

How many pounds is 1 kg?

One kilogram is 1 ÷ 0.45359237 = 2.20462 pounds, or 2 lb 3.3 oz. Many people round it to 2.2 pounds.

How do I convert lbs to kg?

Multiply the pounds by 0.45359237. For example, 150 lb × 0.45359237 = 68.04 kg. A quick estimate is to halve the pounds and subtract 10%.

Is 1 lb exactly 0.45359237 kg?

Yes. Since 1959 the avoirdupois pound has been defined as exactly 0.45359237 kilogram, and NIST Handbook 44 lists 453.59237 grams as exact. The factor 2.20462 lb per kg is the rounded one.

How many kg is a stone?

One stone is 14 pounds, which is 14 × 0.45359237 = 6.35029318 kg, about 6.35 kg.

What is the difference between a ton and a tonne?

A tonne, or metric ton, is 1,000 kg (about 2,204.62 lb). In the US, "ton" usually means the short ton of 2,000 lb (907.18 kg); the UK long ton is 2,240 lb (1,016.05 kg).

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