Miles per US gallon to miles per imperial gallon converter
Convert miles per US gallon (mpg US) to miles per imperial gallon (mpg imp), reverse the direction, or convert a batch. Compare vehicle efficiency stated as distance traveled per unit fuel. Your inputs stay in this browser tab.
Your result
A little input. A useful result.
Your result will appear here.How to use miles per us gallon to miles per imperial gallon converter
Convert miles per US gallon (mpg US) to miles per imperial gallon (mpg imp), reverse the direction, or convert a batch. Compare vehicle efficiency stated as distance traveled per unit fuel. This free tool runs locally after you choose to start.
- Enter your own values, or start with the visible example.
- Adjust values, one per line (up to 200), direction, significant digits (3–15) as needed.
- Choose the action button. Review the result, then copy text or download a file when available.
- Choose Clear all when finished to remove inputs and results from the interface.
Limits, without the small print.
Uses fixed km/L reference definitions and floating-point arithmetic. Up to 200 values, nonzero magnitude from 10^-100 to 10^100. Results are rounded to your chosen significant digits. This family converts distance per volume. Consumption in L/100 km is reciprocal, not a linear unit factor.
One job runs at a time. You can cancel it; jobs stop after 30 seconds. Browser and device capabilities affect performance.
Understand the safeguards →What this tool does
Convert to km/L, then to the destination: y = (x × 0.425143707430272 + 0 − 0) / 0.3540061899346471. Reverse direction swaps the two unit definitions.
Example input
1 mpg US
Example result
1.2009499255 mpg imp
Reference: NIST Guide to the SI: unit conversion reference. Unit conventions and rounding are stated above.
A couple of useful answers.
Does miles per us gallon to miles per imperial gallon converter upload my data?
No. This tool processes your input in a browser worker. Your text and files are not sent to an application server. The static host receives page and asset requests; see our privacy explanation.
Is this tool free for work and study?
Yes. No account, paid API, usage subscription or watermark fee is required. You remain responsible for your content rights and checking results. Hosting providers and their free tiers are separate from this open-source software.
What should I check before relying on the result?
Uses fixed km/L reference definitions and floating-point arithmetic. Up to 200 values, nonzero magnitude from 10^-100 to 10^100. Results are rounded to your chosen significant digits. This family converts distance per volume. Consumption in L/100 km is reciprocal, not a linear unit factor. Review important outputs against the source, especially financial, legal, identity, medical and research calculations.