# lbs to kg Converter

URL: https://speedycalculator.com/calculators/conversion/lbs-to-kg/
Last updated: 2026-10-25

> Convert pounds (lb) to kilograms (kg): 1 pound = 0.45359237 kg, so multiply by 0.45359237 or divide by 2.2046226. Both fields are editable, so you can also type in kilograms and get pounds back.

## Inputs

- Pounds (lb)

## Results

- Kilograms

## Formula

```
1 lb = 0.45359237 kg
1 kg = 2.2046226 lb
kg = lb × 0.45359237
```

## Explanation

Divide pounds by 2.20462, or multiply by 0.45359237, to get kilograms. Use it for body weight, airline baggage, shipping and recipes.

### How to use the lbs to kg Converter

- Type the number of pounds into the **Pounds** field. Decimals such as 75 are fine.
- Read the answer in **Kilograms** – it updates as you type, with no button to press.
- To convert the other way, type into **Kilograms** and the pounds are recalculated.
- Press **Copy results** to copy both values with the page title, or **Copy link** to share this exact conversion.

This page converts only lb ⇄ kg. Need a different unit? Use the general weight converter, where you can choose any “from” and “to” unit.

### How it works

Both units measure weight, so they are always in the same ratio: one pound equals 0.45359237 kilograms. The calculator multiplies the number of pounds you type by 0.45359237 to give kilograms, and when you type into the kilograms field it divides by the same factor to give pounds. Because the ratio never changes, doubling the pounds always doubles the kilograms. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).

### How to convert pounds to kilograms

- Write down the value in pounds, for example **150 lb**.
- Multiply by the conversion factor 0.45359237 (because 1 pound = 0.45359237 kg).
- 150 × 0.45359237 = **68.038855 kg**.
- To go back from kilograms to pounds, divide by 0.45359237 – or multiply by 2.2046226.

### lb to kg conversion table

PoundsKilogramsKilogramsPounds1 lb0.45359237 kg1 kg2.2046226 lb10 lb4.5359237 kg2 kg4.4092452 lb20 lb9.0718474 kg5 kg11.023113 lb45 lb20.411657 kg10 kg22.046226 lb50 lb22.679619 kg20 kg44.092452 lb120 lb54.431084 kg50 kg110.23113 lb130 lb58.967008 kg100 kg220.46226 lb150 lb68.038855 kg1,000 kg2,204.6226 lb160 lb72.574779 kg200 lb90.718474 kg220 lb99.790321 kg300 lb136.07771 kg

### What is a pound?

The avoirdupois pound is defined as exactly 0.45359237 kg and is divided into 16 ounces. It is the everyday weight unit in the U.S. and is still widely used in the UK for body weight and food.

### What is a kilogram?

The kilogram is the SI base unit of mass. Since 2019 it has been defined through the Planck constant rather than a platinum-iridium cylinder kept near Paris.

### Quick mental conversion

For a fast estimate, multiply pounds by about **0.45** to get kilograms; the error is about 0.8%. Use the calculator above when you need the exact figure.

### Common mistakes to avoid

Confusing fluid ounces (volume) with ounces (weight), using troy ounces for food or regular ounces for gold, and mixing u.s. short tons, uk long tons and metric tonnes.

## Worked example

Inputs — Pounds: 150 lb.

Results — **Kilograms = 68.0388555 kg**.

## FAQ

**How many kg is 150 lb?**
About 68.04 kg.

**What is a stone in kg?**
14 lb, about 6.35 kg.

**How do I convert pounds to kilograms?**
Multiply the number of pounds by 0.45359237. For example, 150 lb × 0.45359237 = 68.038855 kg.

**How do I convert kilograms back to pounds?**
Divide by 0.45359237 (or multiply by 2.2046226), or simply type the value into the kilograms field above.

**What is 10 lb in kilograms?**
10 lb = 4.5359237 kg.

**What is 100 lb in kilograms?**
100 lb = 45.359237 kg.

**Is this conversion exact?**
Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit.

**Can I convert to other units on this page?**
This page converts only between pounds and kilograms. To pick any weight unit, use the general weight converter linked under Related calculators.

**What formula does the lbs to kg Converter use?**
1 lb = 0.45359237 kg.


## Sources

- [NIST Special Publication 811 – Guide for the Use of the International System of Units](https://www.nist.gov/pml/special-publication-811)
- [NIST Handbook 44 Appendix C – General tables of units of measurement](https://www.nist.gov/pml/owm/nist-handbook-44-current-edition)