# Kilograms to Pounds (kg to lb)

> Convert kilograms to pounds: 1 kg = 2.20462 lb. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

- Page id: `kg-to-lbs` · Quantity: Mass (`mass`, base unit kg) · Tool: `convert_units`
- Canonical page: https://tttkmbb.com/conversion/kg-to-lbs · This document: https://tttkmbb.com/conversion/kg-to-lbs.md · JSON: https://tttkmbb.com/conversion/kg-to-lbs.json (add `?value=` for a result)

## Formula

- `1 kg = 2.20462 lb`
- `pounds = kilograms × 2.204622622`
- Reverse: `kilograms = pounds × 0.45359237`

The factor follows from the SI definitions of both units (NIST SP 811); values below are rounded to 6 significant figures, the API returns up to 12.

## Worked examples

- 5 kg = 11.0231 lb
- 12.5 kg = 27.5578 lb
- 100 kg = 220.462 lb

## Conversion table

| Kilograms (kg) | Pounds (lb) |
| --- | --- |
| 1 | 2.20462 |
| 2 | 4.40925 |
| 3 | 6.61387 |
| 4 | 8.81849 |
| 5 | 11.0231 |
| 6 | 13.2277 |
| 7 | 15.4324 |
| 8 | 17.637 |
| 9 | 19.8416 |
| 10 | 22.0462 |
| 15 | 33.0693 |
| 20 | 44.0925 |
| 25 | 55.1156 |
| 30 | 66.1387 |
| 40 | 88.1849 |
| 50 | 110.231 |
| 75 | 165.347 |
| 100 | 220.462 |
| 200 | 440.925 |
| 250 | 551.156 |
| 500 | 1102.31 |
| 1000 | 2204.62 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=kg&to_unit=lb` → unified JSON envelope with `result.values.result`, `formula`, `factor`, `sources`, `freshness`
- MCP: server `https://tttkmbb.com/mcp`, tool `convert_units` with `{"value":5,"from_unit":"kg","to_unit":"lb"}`
- All mass units: https://tttkmbb.com/api/v1/units?quantity=mass · full converter: [Mass / Weight Converter](https://tttkmbb.com/conversion/mass.md)
- Authentication: none. Freshness: `static` (fixed conversion factors).

## FAQ

**How many pounds are in one kilogram?**

1 kg = 2.20462 lb. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.

**What is the formula to convert kilograms to pounds?**

Multiply the value in kilograms by 2.204622622: pounds = kilograms × 2.204622622. For example, 5 kg = 11.0231 lb.

**How do I convert pounds back to kilograms?**

Multiply by the inverse factor 0.45359237 (kilograms = pounds × 0.45359237), or use the pounds-to-kilograms page.

## Related conversions

- [Pounds to kilograms](https://tttkmbb.com/conversion/lbs-to-kg.md) (reverse)
- [Grams to Ounces](https://tttkmbb.com/conversion/grams-to-oz.md)
- [Ounces to Grams](https://tttkmbb.com/conversion/oz-to-grams.md)
- [Kilograms to Stone](https://tttkmbb.com/conversion/kg-to-stone.md)
- [Stone to Kilograms](https://tttkmbb.com/conversion/stone-to-kg.md)
- [Pounds to Ounces](https://tttkmbb.com/conversion/lbs-to-oz.md)
- [Ounces to Pounds](https://tttkmbb.com/conversion/oz-to-lbs.md)
- [Kilograms to Grams](https://tttkmbb.com/conversion/kg-to-grams.md)
- [Grams to Kilograms](https://tttkmbb.com/conversion/grams-to-kg.md)

## Data Sources

- NIST Special Publication 811 – Guide for the Use of the International System of Units (SI), Appendix B conversion factors — https://www.nist.gov/pml/special-publication-811 (standard, retrieved 2026-09-24)
- BIPM – The International System of Units (SI Brochure, 9th edition) — https://www.bipm.org/en/publications/si-brochure (standard, retrieved 2026-09-24)
- Wikipedia – Conversion of units — https://en.wikipedia.org/wiki/Conversion_of_units (reference, retrieved 2026-09-24)