# Liters per 100 km to Miles per US gallon (mpg) (L/100km to mpg (US))

> Convert liters per 100 km to miles per US gallon (mpg) with the formula mpg (US) = 235.214583 / (L/100km). Conversion table and worked examples, with JSON API and MCP access.

- Page id: `l-per-100km-to-mpg` · Quantity: Fuel economy (`fuel-economy`, base unit L/100km) · Tool: `convert_units`
- Canonical page: https://tttkmbb.com/conversion/l-per-100km-to-mpg · This document: https://tttkmbb.com/conversion/l-per-100km-to-mpg.md · JSON: https://tttkmbb.com/conversion/l-per-100km-to-mpg.json (add `?value=` for a result)

## Formula

- `mpg (US) = 235.214583 / (L/100km)`
- `mpg (US) = 235.214583 / (L/100km)`
- Reverse: `L/100km = 235.214583 / mpg (US)`

Non-linear conversion: apply the formula directly; there is no single multiplication factor.

## Worked examples

- 7.5 L/100km = 31.3619 mpg (US)
- 30 L/100km = 7.84049 mpg (US)
- 45 L/100km = 5.22699 mpg (US)

## Conversion table

| Liters per 100 km (L/100km) | Miles per US gallon (mpg) (mpg (US)) |
| --- | --- |
| 3 | 78.4049 |
| 4 | 58.8036 |
| 5 | 47.0429 |
| 6 | 39.2024 |
| 7 | 33.6021 |
| 8 | 29.4018 |
| 9 | 26.135 |
| 10 | 23.5215 |
| 12 | 19.6012 |
| 15 | 15.681 |
| 20 | 11.7607 |
| 25 | 9.40858 |
| 30 | 7.84049 |
| 35 | 6.72042 |
| 40 | 5.88036 |
| 45 | 5.22699 |
| 50 | 4.70429 |
| 60 | 3.92024 |
| 70 | 3.36021 |
| 80 | 2.94018 |
| 100 | 2.35215 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=7.5&from_unit=L%2F100km&to_unit=mpg_us` → unified JSON envelope with `result.values.result`, `formula`, `factor`, `sources`, `freshness`
- MCP: server `https://tttkmbb.com/mcp`, tool `convert_units` with `{"value":7.5,"from_unit":"L/100km","to_unit":"mpg_us"}`
- All fuel economy units: https://tttkmbb.com/api/v1/units?quantity=fuel-economy · full converter: [Fuel Economy Converter](https://tttkmbb.com/conversion/fuel-economy.md)
- Authentication: none. Freshness: `static` (fixed conversion factors).

## FAQ

**What is the formula to convert liters per 100 km to miles per US gallon (mpg)?**

mpg (US) = 235.214583 / (L/100km). For example, 7.5 L/100km = 31.3619 mpg (US).

**How do I convert miles per US gallon (mpg) back to liters per 100 km?**

L/100km = 235.214583 / mpg (US); the miles per US gallon (mpg)-to-liters per 100 km page applies it directly.

**Why is there no single multiplication factor?**

Fuel-economy units are reciprocal (distance per volume versus volume per distance), so the conversion divides a constant by the value instead of multiplying.

## Related conversions

- [Miles per US gallon (mpg) to liters per 100 km](https://tttkmbb.com/conversion/mpg-to-l-per-100km.md) (reverse)
- [Miles per imperial gallon (UK mpg) to Liters per 100 km](https://tttkmbb.com/conversion/mpg-uk-to-l-per-100km.md)
- [Liters per 100 km to Miles per imperial gallon (UK mpg)](https://tttkmbb.com/conversion/l-per-100km-to-mpg-uk.md)
- [Kilometers per liter to Liters per 100 km](https://tttkmbb.com/conversion/km-per-liter-to-l-per-100km.md)
- [Liters per 100 km to Kilometers per liter](https://tttkmbb.com/conversion/l-per-100km-to-km-per-liter.md)
- [Miles per US gallon (mpg) to Kilometers per liter](https://tttkmbb.com/conversion/mpg-to-km-per-liter.md)
- [Kilometers per liter to Miles per US gallon (mpg)](https://tttkmbb.com/conversion/km-per-liter-to-mpg.md)
- [Miles per US gallon (mpg) to Miles per imperial gallon (UK mpg)](https://tttkmbb.com/conversion/mpg-to-mpg-uk.md)
- [Miles per imperial gallon (UK mpg) to Miles per US gallon (mpg)](https://tttkmbb.com/conversion/mpg-uk-to-mpg.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)