# Pounds to Grams (lb to g)

> Convert pounds to grams: 1 lb = 453.592 g. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

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

## Formula

- `1 lb = 453.592 g`
- `grams = pounds × 453.59237`
- Reverse: `pounds = grams × 0.002204622622`

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 lb = 2267.96 g
- 12.5 lb = 5669.9 g
- 100 lb = 45359.2 g

## Conversion table

| Pounds (lb) | Grams (g) |
| --- | --- |
| 1 | 453.592 |
| 2 | 907.185 |
| 3 | 1360.78 |
| 4 | 1814.37 |
| 5 | 2267.96 |
| 6 | 2721.55 |
| 7 | 3175.15 |
| 8 | 3628.74 |
| 9 | 4082.33 |
| 10 | 4535.92 |
| 15 | 6803.89 |
| 20 | 9071.85 |
| 25 | 11339.8 |
| 30 | 13607.8 |
| 40 | 18143.7 |
| 50 | 22679.6 |
| 75 | 34019.4 |
| 100 | 45359.2 |
| 200 | 90718.5 |
| 250 | 113398 |
| 500 | 226796 |
| 1000 | 453592 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=lb&to_unit=g` → 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":"lb","to_unit":"g"}`
- 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 grams are in one pound?**

1 lb = 453.592 g. 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 pounds to grams?**

Multiply the value in pounds by 453.59237: grams = pounds × 453.59237. For example, 5 lb = 2267.96 g.

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

Multiply by the inverse factor 0.002204622622 (pounds = grams × 0.002204622622), or use the grams-to-pounds page.

## Related conversions

- [Grams to pounds](https://tttkmbb.com/conversion/grams-to-lbs.md) (reverse)
- [Kilograms to Pounds](https://tttkmbb.com/conversion/kg-to-lbs.md)
- [Pounds to Kilograms](https://tttkmbb.com/conversion/lbs-to-kg.md)
- [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)

## 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)