How do I convert MPG (UK) to Wh/mi?

Use the formula shown above or enter a value to see MPG (UK) converted to Wh/mi instantly.

What is the formula for MPG (UK) to Wh/mi?

The converter calculates Wh/mi by applying the category-specific conversion factor for Fuel Economy.

When should I use MPG (UK) vs Wh/mi?

MPG (UK) and Wh/mi are both part of the Fuel Economy category; pick the unit that matches your measurement context (e.g., scale, region, or industry standard).

Fuel Economy & Efficiency Reference

Convert MPG (UK) to Wh/mi

Use the live converter below to translate between Mile per Gallon (UK) (MPG (UK)) and Watt-hour per mile (Wh/mi). Scroll further for quick examples, formula tips, and related units.

Formula insight: Direct fuel economy conversions use multiplication by the conversion factor to account for different distance and volume units.

Convert

MPG (UK) → Wh/mi

Mile per Gallon (UK)

MPG (UK)

Watt-hour per mile

43,187.855

Wh/mi

Rounded result (4 decimals max)

Formula

1 MPG (UK) = 43,187.855 Wh/mi

Conversion sourcesTap or click to view references

The International System of Units (SI) — NIST Special Publication 330
National Institute of Standards and Technology (NIST). The SI Brochure (SP 330) is the definitive English edition of the BIPM SI tables. NIST’s edition lists the official constants and conversion factors tying inch-pound units to SI, which SwapUnits applies for length, mass, temperature, pressure, volume, and related conversions. See /standards/nist-si-tenfold for the complete decimal multiple/submultiple table. View source · View SI table
Fuel Economy Guide (Model Year 2024)
U.S. Environmental Protection Agency & U.S. Department of Energy. Describes how MPG, km/L, and L/100 km ratings are calculated for the U.S. Monroney label and how to interpret efficiency versus consumption metrics. View source
Alternative Fuels Data Center: Fuel Properties Comparison
U.S. Department of Energy. Lists gasoline lower heating value (about 32 MJ/gal, which is roughly 9.5 kWh per liter), letting the app convert between liquid-fuel efficiency (km/L) and EV metrics (km/kWh, kWh/100 km, Wh/km). View source

Results update as you type. Swap the direction to convert back from Wh/mi to MPG (UK).

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MPG (UK) to Wh/mi quick table

Multiply any row by the same factor to scale results. Use the converter above to enter exact values with your own units.

Mile per Gallon (UK) (MPG (UK))	Watt-hour per mile (Wh/mi)
2 MPG (UK)	21,593.9275 Wh/mi
4 MPG (UK)	10,796.9638 Wh/mi
6 MPG (UK)	7,197.9758 Wh/mi
8 MPG (UK)	5,398.4819 Wh/mi
10 MPG (UK)	4,318.7855 Wh/mi
15 MPG (UK)	2,879.1903 Wh/mi
20 MPG (UK)	2,159.3928 Wh/mi

Wh/mi back to MPG (UK)

Keep the reciprocal handy when double-checking calculations or undoing a conversion.

Watt-hour per mile (Wh/mi)	Mile per Gallon (UK) (MPG (UK))
2 Wh/mi	21,593.9275 MPG (UK)
4 Wh/mi	10,796.9638 MPG (UK)
6 Wh/mi	7,197.9758 MPG (UK)
8 Wh/mi	5,398.4819 MPG (UK)
10 Wh/mi	4,318.7855 MPG (UK)
15 Wh/mi	2,879.1903 MPG (UK)
20 Wh/mi	2,159.3928 MPG (UK)