Fidamen

Convert Liters per 100 Kilometers to Liters per Mile - Fuel Economy Converter

This converter transforms fuel economy reported as liters per 100 kilometers (L/100 km) into liters consumed per mile (L/mi). L/100 km is commonly used in many countries to express fuel consumption; L/mi expresses the same quantity on a per-mile basis for direct comparison with mile-based systems.

The calculation uses the internationally defined length relationship between kilometers and miles so the numeric conversion is exact (within the precision you choose). For practical decision-making, we also highlight measurement limits, rounding guidance, and best practices for comparing instrument and lab measurements.

Updated Nov 26, 2025QA PASS — golden 25 / edge 120Run golden-edge-2026-01-23

Governance

Record 7645535706c0 • Reviewed by Fidamen Standards Committee

Interactive converter unavailable for this calculator.

We could not resolve compatible units for this experience. Please verify the slug follows the pattern `from-unit-to-unit-converter`.

Methodology

The conversion is based on the exact international definitions for the mile and the metre. The international mile is defined as exactly 1,609.344 meters, so 1 kilometre = 0.62137119223733 miles. Therefore 100 kilometres = 62.1371192237339 miles. Converting L/100 km to L/mi divides the reported liters by that mile count.

This tool performs a direct unit conversion only. It does not attempt to correct for vehicle display rounding, fuel temperature effects, or odometer calibration errors. For those adjustments, consult measurement best practices from national laboratories and regulatory guidance.

Worked examples

Input: 5 L/100 km → Output: 0.08044 L/mi

Input: 8 L/100 km → Output: 0.12877 L/mi

Input: 12 L/100 km → Output: 0.19303 L/mi

F.A.Q.

Why does the converter divide by 62.1371192237339?

Because 100 kilometres is exactly 62.1371192237339 miles using the international mile definition (1 mile = 1,609.344 m). L/100 km gives liters used per 100 km; to express that per mile you divide by the number of miles in 100 km.

How accurate is this conversion?

The underlying length conversion is exact by international definition, so the conversion itself introduces no physical error. Practical differences arise from measurement uncertainty (fuel volume measurement, odometer accuracy, fuel temperature). For laboratory-grade accuracy follow guidance from national metrology institutes and EPA/DOE testing protocols.

Why might this differ from my vehicle's display or mpg calculators?

Vehicle displays and onboard calculations use internal sensors and sampling windows; they may average over different distances or use rolling averages and rounding rules. Fill-up (tank-to-tank) methods and laboratory tests follow stricter protocols and will differ from instantaneous display values.

Does this account for US vs Imperial gallons or temperature corrections?

No. This converter converts between metric distance-based consumption units (L/100 km to L/mi). Gallons and temperature-density corrections are separate conversions; use the dedicated gallon or volumetric correction converters for those adjustments.

How should I report precision and rounding?

Report results with precision appropriate to your data. For most vehicle-level comparisons two to three significant digits are adequate (e.g., 0.129 L/mi). For lab or regulatory reporting, follow the precision and uncertainty reporting rules specified by the relevant standard or test procedure.

Sources & citations

Further resources

Versioning & Change Control

Audit record (versions, QA runs, reviewer sign-off, and evidence).

Record ID: 7645535706c0

What changed (latest)

v1.0.0 • 2025-11-26 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Public QA status

PASS — golden 25 + edge 120

Last run: 2026-01-23 • Run: golden-edge-2026-01-23

Engine

v1.0.0

Data

Baseline (no external datasets)

Content

v1.0.0

UI

v1.0.0

Governance

Last updated: Nov 26, 2025

Reviewed by: Fidamen Standards Committee (Review board)

Credentials: Internal QA

Risk level: low

Reviewer profile (entity)

Fidamen Standards Committee

Review board

Internal QA

Entity ID: https://fidamen.com/reviewers/fidamen-standards-committee#person

Semantic versioning

  • MAJOR: Calculation outputs can change for the same inputs (formula, rounding policy, assumptions).
  • MINOR: New features or fields that do not change existing outputs for the same inputs.
  • PATCH: Bug fixes, copy edits, or accessibility changes that do not change intended outputs except for previously incorrect cases.

Review protocol

  • Verify formulas and unit definitions against primary standards or datasets.
  • Run golden-case regression suite and edge-case suite.
  • Record reviewer sign-off with credentials and scope.
  • Document assumptions, limitations, and jurisdiction applicability.

Assumptions & limitations

  • Uses exact unit definitions from the Fidamen conversion library.
  • Internal calculations use double precision; display rounding follows the unit's configured decimal places.
  • Not a substitute for calibrated instruments in regulated contexts.
  • Jurisdiction-specific rules may require official guidance.

Change log

v1.0.0 • 2025-11-26 • MINOR

Initial publication and governance baseline.

Why: Published with reviewed formulas, unit definitions, and UX controls.

Areas: engine, content, ui • Reviewer: Fidamen Standards Committee • Entry ID: 256072c95549