# Liters to Imperial gallons (L to gal (UK))

> Convert liters to imperial gallons: 1 L = 0.219969 gal (UK). Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

- Page id: `liters-to-imperial-gallons` · Quantity: Volume (`volume`, base unit L) · Tool: `convert_units`
- Canonical page: https://tttkmbb.com/conversion/liters-to-imperial-gallons · This document: https://tttkmbb.com/conversion/liters-to-imperial-gallons.md · JSON: https://tttkmbb.com/conversion/liters-to-imperial-gallons.json (add `?value=` for a result)

## Formula

- `1 L = 0.219969 gal (UK)`
- `imperial gallons = liters × 0.2199692483`
- Reverse: `liters = imperial gallons × 4.54609`

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 L = 1.09985 gal (UK)
- 12.5 L = 2.74962 gal (UK)
- 100 L = 21.9969 gal (UK)

## Conversion table

| Liters (L) | Imperial gallons (gal (UK)) |
| --- | --- |
| 1 | 0.219969 |
| 2 | 0.439938 |
| 3 | 0.659908 |
| 4 | 0.879877 |
| 5 | 1.09985 |
| 6 | 1.31982 |
| 7 | 1.53978 |
| 8 | 1.75975 |
| 9 | 1.97972 |
| 10 | 2.19969 |
| 15 | 3.29954 |
| 20 | 4.39938 |
| 25 | 5.49923 |
| 30 | 6.59908 |
| 40 | 8.79877 |
| 50 | 10.9985 |
| 75 | 16.4977 |
| 100 | 21.9969 |
| 200 | 43.9938 |
| 250 | 54.9923 |
| 500 | 109.985 |
| 1000 | 219.969 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=L&to_unit=gal_uk` → 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":"L","to_unit":"gal_uk"}`
- All volume units: https://tttkmbb.com/api/v1/units?quantity=volume · full converter: [Volume Converter](https://tttkmbb.com/conversion/volume.md)
- Authentication: none. Freshness: `static` (fixed conversion factors).

## FAQ

**How many imperial gallons are in one liter?**

1 L = 0.219969 gal (UK). 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 liters to imperial gallons?**

Multiply the value in liters by 0.2199692483: imperial gallons = liters × 0.2199692483. For example, 5 L = 1.09985 gal (UK).

**How do I convert imperial gallons back to liters?**

Multiply by the inverse factor 4.54609 (liters = imperial gallons × 4.54609), or use the imperial gallons-to-liters page.

## Related conversions

- [Imperial gallons to liters](https://tttkmbb.com/conversion/imperial-gallons-to-liters.md) (reverse)
- [Liters to US gallons](https://tttkmbb.com/conversion/liters-to-gallons.md)
- [US gallons to Liters](https://tttkmbb.com/conversion/gallons-to-liters.md)
- [Milliliters to US fluid ounces](https://tttkmbb.com/conversion/ml-to-fl-oz.md)
- [US fluid ounces to Milliliters](https://tttkmbb.com/conversion/fl-oz-to-ml.md)
- [Liters to Milliliters](https://tttkmbb.com/conversion/liters-to-ml.md)
- [Milliliters to Liters](https://tttkmbb.com/conversion/ml-to-liters.md)
- [US cups to Milliliters](https://tttkmbb.com/conversion/cups-to-ml.md)
- [Milliliters to US cups](https://tttkmbb.com/conversion/ml-to-cups.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)