Fuel Economy Converter (US MPG, UK Imperial MPG, L/100km & km/L)

Convert US MPG, UK Imperial MPG, L/100km, and km/L with reciprocal consumption curves.

Metric Fuel Consumption
7.35 L/100km
32 US MPG = 7.35 L/100km ($1,313/yr fuel cost)
Liters per 100 km (L/100km) 7.35 L/100km
Kilometers per Liter (km/L) 13.6 km/L
UK Imperial MPG 38.43 MPG (Imp)
Annual Fuel Cost $1,312.5 (375 gal)
Inputs
MPG (US)
Fuel economy in US Miles Per Gallon (MPG).
miles/yr
Annual distance driven in miles to compare annual fuel volume.
USD/gal
Fuel price per US gallon.
Results & Graph
Metric Fuel Consumption
7.35 L/100km
32 US MPG = 7.35 L/100km ($1,313/yr fuel cost)
Liters per 100 km (L/100km)
7.35 L/100km
Kilometers per Liter (km/L)
13.6 km/L
UK Imperial MPG
38.43 MPG (Imp)
Annual Fuel Cost
$1,312.5 (375 gal)

Metric Fuel Consumption Sensitivity & Breakdown

32 US MPG = 7.35 L/100km ($1,313/yr fuel cost)
Graph 1 • Us Mpg Value Sensitivity Recalculates the domain equation across 50% to 150% of the primary input while holding other parameters constant.
0 13.6 km/L • 38.4 MPG (UK) 7.9 13.6 km/L • 38.4 MPG (UK) 15.9 13.6 km/L • 38.4 MPG (UK) 50%: 14.7 13.6 km/L • 38.4 MPG (UK) 14.7 50% 75%: 9.8 13.6 km/L • 38.4 MPG (UK) 9.8 75% 100%: 7.35 13.6 km/L • 38.4 MPG (UK) 7.3 100% 125%: 5.88 13.6 km/L • 38.4 MPG (UK) 5.9 125% 150%: 4.9 13.6 km/L • 38.4 MPG (UK) 4.9 150%
Graph 2 • Primary & Supporting Metric Comparison Compares the primary output alongside supporting domain benchmarks.
Metric Fuel Consumption 7.35 L/100km Liters per 100 km (L/100km) 7.35 L/100km Kilometers per Liter (km/L) 13.6 km/L UK Imperial MPG 38.43 MPG (Imp)
Graph 3 • Exact Output Table & Units Displays each calculated output in its exact domain unit.
Metric Fuel Consumption7.35 L/100kmLiters per 100 km (L/100km)7.35 L/100kmKilometers per Liter (km/L)13.6 km/LUK Imperial MPG38.43 MPG (Imp)Annual Fuel Cost$1,312.5 (375 gal)
Summary: 32 US MPG converts to 7.35 L/100km (13.6 km/L) and 38.4 UK Imperial MPG.
Summary: 32 US MPG converts to 7.35 L/100km (13.6 km/L) and 38.4 UK Imperial MPG.
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Interactive chart & math engine powered by CalculatorGraph

Metric Fuel Consumption Reference Schedule

US MPGL / 100 kmkm / LiterUK Imperial MPGAnnual Fuel ($)
20 MPG11.76 L/100km8.5 km/L24 MPG$2,100
25 MPG9.41 L/100km10.63 km/L30 MPG$1,680
32 MPG7.35 L/100km13.6 km/L38.4 MPG$1,313
40 MPG5.88 L/100km17.01 km/L48 MPG$1,050
50 MPG4.7 L/100km21.26 km/L60 MPG$840

Formula & Mathematical Methodology: MPG ↔ L/100km ↔ km/L Formula

L/100km = 235.214583 / MPGUS
MPGUK = MPGUS × 1.20095
km/L = MPGUS × 0.4251437
L/100km = 235.214583 / MPG_US; MPG_UK = MPG_US × 1.20095; km/L = MPG_US × 0.4251437
  • Us Mpg Value: Fuel economy in US Miles Per Gallon (MPG).
  • Annual Driving Miles: Annual distance driven in miles to compare annual fuel volume.
  • Fuel Price Per Us Gallon: Fuel price per US gallon.

Rounding: Full IEEE-754 double precision internally; display values formatted to 2–4 significant figures.

Worked Example: Default MPG ↔ L/100km ↔ km/L Scenario

Convert vehicle fuel efficiency between US Miles Per Gallon (MPG US), UK Imperial MPG (MPG Imp = 1.20095 × MPG US), Liters per 100 km (L/100km = 235.2146 / MPG US), and Kilometers per Liter (km/L).

  1. Enter parameters for MPG ↔ L/100km ↔ km/L in the input controls.
  2. Apply formula: L/100km = 235.214583 / MPG_US; MPG_UK = MPG_US × 1.20095; km/L = MPG_US × 0.4251437.
  3. Inspect the 3 interactive SVG charts and comparison table for sensitivity across input ranges.
Result: Produces instant MPG ↔ L/100km ↔ km/L output with domain-verified units and sensitivity table.

Frequently Asked Questions

How is MPG ↔ L/100km ↔ km/L calculated?

Fuel Economy Converter (US MPG, UK Imperial MPG, L/100km & km/L) uses the verified equation: L/100km = 235.214583 / MPG_US; MPG_UK = MPG_US × 1.20095; km/L = MPG_US × 0.4251437. Adjust any input field to recalculate all outputs and 3 SVG visualizations in real time.

What units does the MPG ↔ L/100km ↔ km/L tool use?

Each field displays its exact unit label (MPG (US), miles/yr, USD/gal) so results remain dimensionally consistent.

Can I solve backwards for a target output using Goal Seek?

Yes. Click "🎯 Goal Seek" in the results toolbar to solve backwards for any numeric input parameter.

Unit Conversions · Energy, Power & Automotive Units

Fuel Economy Converter (US MPG, UK Imperial MPG, L/100km & km/L): inputs, method, and how to read the result

Convert US MPG, UK Imperial MPG, L/100km, and km/L with reciprocal consumption curves.

Choose inputs for the case you are checking

The defaults are illustrative. Replace them with values for your case and keep the units shown beside each field.

  • Us Mpg Value: Fuel economy in US Miles Per Gallon (MPG).
  • Annual Driving Miles: Annual distance driven in miles to compare annual fuel volume.
  • Fuel Price Per Us Gallon: Fuel price per US gallon.

What the calculation includes

With the default values shown, Metric Fuel Consumption is 7.35 L/100km. The calculation follows MPG ↔ L/100km ↔ km/L Formula; the formula and variable definitions above show how the inputs combine.

One-input check: With the other defaults held constant, changing Us Mpg Value from 32 MPG (US) to 35 MPG (US) changes Metric Fuel Consumption from 7.35 L/100km to 6.72 L/100km. This is a comparison inside the calculator's stated model, not a prediction.

Where to use caution

  • Inputs are within standard operating ranges for the specified equation.
  • Extreme boundary conditions may require specialized empirical adjustments.

Scope: Global Standard Check the assumptions and limitations against your situation before relying on the estimate.

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