Elysia Tools

Browse tools, examples, visual explainers, and topic guides from one clear workspace.

Top Categories

Hubs

Language
ZHESPTRUFRDEEN

Elysia Tools

Navigation

Math & Numbers

Fuel Consumption Converter (L/100km / mpg US / mpg UK / km/L)

· Last updated：2026-08-02

Convert fuel consumption / fuel economy between L/100km, miles per US gallon (mpg US), miles per Imperial gallon (mpg UK), and km/L. mpg and L/100km are reciprocal (higher mpg = lower L/100km), so conversion goes through the km/L axis, not a single multiplier. Defining constants are exact by law: 1 US gallon = 3.785411784 L (NIST HB 44), 1 Imperial gallon = 4.54609 L (UK W&M Act 1985), 1 mile = 1.609344 km (1959 agreement). Reference: a compact car at ~6 L/100km ≈ 39 mpg US ≈ 47 mpg UK.

Execution

Run this tool

Fill in the form, run the tool, and review the result in one place.

Samples

Examples that match this tool

Related

Continue with connected tools and hubs

Written by the Elysia Tools team

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Math & Numbers
Input types
select, number
Output type
json
Sample coverage
4
API ready
Yes

Overview

Convert a positive fuel consumption value between L/100km, mpg US, mpg UK, and km/L. The converter returns the selected result with configurable decimal places and includes equivalent values for all supported units.

When to use

  • Compare vehicle fuel economy listed in L/100km, mpg US, or mpg UK.
  • Convert a car's fuel consumption before estimating efficiency in another measurement system.
  • Check equivalent fuel economy values using consistent unit definitions for gallons and miles.

How it works

  1. 1Choose the input unit: L/100km, mpg US, mpg UK, or km/L.
  2. 2Enter a strictly positive fuel consumption value.
  3. 3Select the output unit and set decimal places from 0 to 10.
  4. 4The converter calculates the result through the km/L relationship and returns equivalent values for all four units.

Use cases

  • Vehicle specification comparison across US, UK, and metric markets.
  • Fuel economy research for compact cars, sedans, and other vehicles.
  • Converting road-trip or automotive data into the unit used in a local report.

Examples

1. Convert compact-car consumption to mpg US

Car buyer

Background

A car buyer finds a compact vehicle rated at 6 L/100km and wants to compare it with US fuel economy figures.

Problem

Translate the metric consumption value into mpg US while keeping the result precise.

How to use

Set Input unit to L/100km, enter 6, choose mpg US as the Output unit, and use 4 decimal places.

Input unit: L/100km; Value: 6; Output unit: mpg US; Decimal Places: 4

Outcome

The result is 39.2024 mpg US. The equivalent values are 47.0794 mpg UK and 16.6667 km/L.

2. Convert US fuel economy to L/100km

Automotive researcher

Background

An automotive researcher has a vehicle rating of 30 mpg US and needs the metric equivalent for a comparison table.

Problem

Convert the US fuel economy figure into litres per 100 kilometres.

How to use

Set Input unit to mpg US, enter 30, choose L/100km as the Output unit, and use 4 decimal places.

FAQ

Which fuel consumption units are supported?

The converter supports L/100km, mpg US, mpg UK, and km/L.

What is the difference between mpg US and mpg UK?

They use different gallon sizes. An Imperial gallon is larger than a US gallon, so the same vehicle generally has a higher numeric mpg UK value.

Can I convert mpg to L/100km?

Yes. Enter a positive mpg US or mpg UK value, choose L/100km as the output unit, and calculate.

Why are mpg and L/100km reciprocal?

mpg measures distance per gallon, while L/100km measures fuel used per distance. Higher mpg therefore corresponds to lower L/100km.

How many decimal places can I display?

You can choose from 0 to 10 decimal places. The default is 4.

Home
Tools3201
Samples593
Visualizations465
Viewers103
Hubs233
Tags333
Images, Audio & Video657

Image, audio, and video processing, conversion, and optimization tools

Math, Date & Finance644

Calculators, numerics, date logic, statistics, and finance tools

Design & Color297

Color, layout, graphics, visual styling, and design helper tools

Text & Writing209

Writing, cleanup, formatting, extraction, and text analysis tools

Developer & Web193

Developer utilities, networking, web debugging, and automation helpers

Conversion & Encoding175

Format, file, archive, unit, and encoding conversion tools

FLAC/WAV Source Screening and Evidence Handoff
Self-Hosted Giveaway Widget Review and Embed Handoff
Stripe Promo Code Batch Review and Import Preflight
Batch Photo Culling Review and Editing Shortlist Handoff
UI Screenshot Structure Review and Development Handoff

© 2026 Elysia Tools. All rights reserved.

DocsPricingAboutTerms of ServicePrivacy PolicyCookiesContact
Python

Web Image Processing Python Samples

Web Python image processing examples using PIL/Pillow including reading, saving, resizing, and format conversion

Java

Android Image Processing Java Samples

Android Java image processing examples including reading/saving images, scaling, and format conversion

Kotlin

Android Image Processing Kotlin Samples

Android Kotlin image processing examples including reading/saving images, scaling, and format conversion

Rust

Web Image Processing Rust Samples

Web Rust image processing examples including image read/save, scaling, and format conversion

Math & Numbers

Air Changes per Hour (ACH, n = Q/V)

Compute the air change rate (ACH / n) of a room from the outdoor supply airflow Q and the room volume V: n = Q/V (1/h). Three modes: solve ACH (given Q and V), solve airflow (given n and V), or solve volume (given n and Q). Flow in m³/s/m³/h/CFM, volume in m³/ft³/L. Also reports the well-mixed single-zone purge time to reach a target residual fraction ε (default 1%): t = −ln(ε)/n hours.

Math & Numbers

Bolt Torque Clamp Force Calculator

Convert between bolt tightening torque and axial clamp force. T = K·F·d, where K is the nut factor (~0.20 for dry steel). Solve torque from force, or force from torque.

Math & Numbers

Cable Ampacity Calculator (IEC 60364-5-52)

Estimate copper cable current-carrying capacity per the simplified IEC 60364-5-52 reference method. Combines cross-section, insulation (PVC 70°C / XLPE 90°C), installation method, and ambient temperature to derive the corrected allowable ampacity (A).

Math & Numbers

Capacitor Reactive Power Calculator (Q_c = 2πfCU²)

Compute the reactive power produced by a known capacitor: Q_c = 2π·f·C·U². Supports single-phase, three-phase star (Y) and delta (Δ) connections. Returns Q_c in var/kvar, capacitive reactance Xc, and capacitor current Ic. Complementary to the power-factor-correction tool (which sizes a capacitor for a target cosφ).

Input unit: mpg US; Value: 30; Output unit: L/100km; Decimal Places: 4

Outcome

The result is 7.8405 L/100km. The equivalent values are 36.0285 mpg UK and 12.7543 km/L.