# Gas Mileage Calculator

> Gas mileage calculator: convert fuel gallons used and miles driven into MPG or L/100km instantly for any trip or fill-up. Free, runs locally, no signup.

- **Canonical URL:** https://boringtoolskit.com/gas-mileage-calculator/
- **Category:** Everyday Calculators
- **Evidence level:** authored-methodology
- **Reviewed:** August 2026
- **Last verified:** 2026-10-12
- **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request.

## How it works

MPG = miles ÷ gallons (US). L/100km = liters ÷ km × 100.

## Sources

- [Calculation methodology and verification standard](/methodology/)

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*Local planning estimate. Verify current terms, rates, and policies before acting.*