⛽ Fuel Consumption Calculator

🔧 Mode

↔ Consumption Conversion

🚗 Trip Parameters

📤 Result

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📊 Conversion Detail

From
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To
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Numeric value
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🚗 Trip Detail

Distance
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Fuel needed
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Total cost
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Currency
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Trip computed by converting distance to km and consumption to L/100km, multiplying to fuel litres, then converting into the price unit's volume before applying the price.

⚠️

ℹ️ About Fuel Consumption Calculator

What is fuel consumption?

Fuel consumption (also called fuel economy) is the relationship between the volume of fuel a vehicle burns and the distance it travels. Two equivalent ways of expressing it are common: distance per volume (miles per gallon, kilometres per litre — bigger numbers are better) and volume per distance (litres per 100 km — smaller numbers are better). This tool converts cleanly between all four common units and then uses the result to cost out a trip in any of six common price unit + currency combinations.

Use cases

  • Convert a US window-sticker mpg value into European L/100km.
  • Compare US and UK mpg figures, which use different gallons.
  • Convert km/L (used in Japan, India, and many Latin American markets) into mpg.
  • Plan a road trip: enter the distance, your car's consumption, and the local pump price to get fuel volume and total cost.
  • Cross-check a manufacturer's combined fuel-economy claim.

Conversion identities

  • US mpg ↔ L/100km: l_per_100km = 235.2146 / mpg_us (and the reverse). The constant is (3.785411784 × 100) / 1.609344.
  • UK mpg ↔ L/100km: l_per_100km = 282.4809 / mpg_uk. The constant is (4.54609 × 100) / 1.609344.
  • km/L ↔ L/100km: km_per_l = 100 / l_per_100km.
  • US ↔ UK mpg is not a clean swap. A 30 mpg US car is roughly 36 mpg UK because the UK gallon is about 20% larger. This tool handles the two-step conversion through L/100km exactly.

Volume definitions

  • US gallon = 3.785411784 L exactly (231 in³ — NIST SP 811 §B.8).
  • UK (Imperial) gallon = 4.54609 L exactly (UK Weights & Measures Act 1985).
  • 1 mile = 1.609344 km exactly (international yard agreement, 1959).

Worked example — trip cost

Drive 400 km in a car that consumes 8 L/100km, with petrol at €1.50/L:

  • Fuel needed: 400 × 8 ÷ 100 = 32 L.
  • Cost: 32 × €1.50 = €48.00.

For a US example: 200 mi at 25 mpg (US) with $3.50/gal (US) needs 200 ÷ 25 = 8 US gallons and costs $28.00.

References

  • NIST SP 811 — Guide for the Use of the International System of Units (SI), Appendix B.8 (volume + length factors): physics.nist.gov.
  • US EPA / DOE — Fuel Economy Glossary & Conversions: fueleconomy.gov.
  • UK GOV — Weights and Measures Act 1985 (Imperial gallon = 4.54609 L exactly): legislation.gov.uk.

Calculations run in your browser. The API endpoint mirrors the identical TypeScript algorithm via the project's Node bridge.

API Usage Example:

POST /api/tools/math/fuel-consumption-calculator
Content-Type: application/json

{
    "operation": "convertConsumption",
    "value": 30,
    "fromUnit": "mpg_us",
    "toUnit": "l_per_100km"
}
Ready