Volume Unit Converter

Instantly convert liters, milliliters, gallons (US & UK), quarts, pints, cups, fluid ounces, cubic feet, and cubic inches. Fast, accurate, and 100% private runs entirely in your browser.

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Fast, Free, Private Volume Unit Converter (Offline)

Convert volume units instantly L, mL, gal (US & UK), qt, pt, cups, fl oz, ft³, in³. 100% client side, lifetime free, unlimited use. No uploads, no sign ups, truly private. Top, fast, best-in-class, and secure on https://www.alltoolai.com/volume-unit-converter.

Trusted worldwide. Your information is 100% confidential and secure.

Why people love this volume converter

Offline & private

Runs entirely in your browser. No data leaves your device ever.

Unlimited & free forever

No accounts, no limits convert as much as you want, for life.

Fast & accurate

Instant results with precise conversion factors and smart rounding.

Works everywhere

Modern browsers on Windows, Mac, Linux, iOS, and Android.

Clear unit coverage

US & UK (Imperial) systems supported, plus metric and cubic units.

No data collected

Truly private: no tracking, uploads, or cloud processing.

Popular uses worldwide

Cooking & baking

Convert cups, tablespoons, and teaspoons to mL or L in recipes.

Beverage & bartending

Switch between fl oz, shots, cups, and mL for consistent pours.

Lab & pharmacy

Convert mL to L and between US/UK fl oz for protocols and reports.

Automotive & fluids

Translate service volumes between liters, quarts, and gallons.

Brewing & distilling

Move seamlessly between gallons, pints, and liters for batches.

Aquariums & pools

Estimate tank and pool volumes using ft³, in³, and liters.

How to convert volume units

  1. Select your “From” unit (e.g., US gallon).
  2. Enter a value (e.g., 2.5).
  3. Select your “To” unit (e.g., liters).
  4. See instant results and the 1 unit summary below.
  5. Use “Reset” to start again.

Tip: You can type on either side both fields update intelligently.

Supported units

Liter (L)
Milliliter (mL)
Cubic meter (m³)
US liquid gallon (US gal)
US liquid quart (US qt)
US liquid pint (US pt)
US legal cup (US legal c)
US fluid ounce (US fl oz)
US tablespoon (US tbsp)
US teaspoon (US tsp)
Imperial gallon (imp gal)
Imperial quart (imp qt)
Imperial pint (imp pt)
Imperial cup (imp cup)
Imperial fluid ounce (imp fl oz)
Imperial tablespoon (imp tbsp)
Imperial teaspoon (imp tsp)
Cubic foot (ft³)
Cubic inch (in³)

Note: “US legal cup” = 240 mL (nutrition labeling). A “US customary cup” is ~236.588 mL, which differs slightly from the legal cup.

Quick reference conversions

  • 1 US gallon = 3.78541 L
  • 1 Imperial (UK) gallon = 4.54609 L
  • 1 US quart = 0.946353 L
  • 1 US pint = 0.473176 L
  • 1 US fluid ounce = 29.5735 mL
  • 1 US tablespoon = 14.7868 mL
  • 1 US teaspoon = 4.92892 mL
  • 1 Imperial fluid ounce = 28.4131 mL
  • 1 cubic foot = 28.3168 L
  • 1 cubic inch = 16.3871 mL
  • 1 US legal cup = 240 mL • 1 US customary cup ≈ 236.588 mL

Best practices

  • Confirm US vs UK (Imperial) units gallons, quarts, pints, and fl oz differ.
  • For recipes, note that volume→mass depends on density (e.g., 1 cup water ≠ 1 cup flour by weight).
  • Use US legal cup (240 mL) for nutrition labels; some recipes use US customary cup (~236.588 mL).
  • Round only at the end if you’ll do more calculations.
  • Keep raw values for records and reproducibility.

Frequently Asked Questions

Is it private and secure?

Yes. Everything runs locally in your browser no uploads, no tracking, no servers. 100% confidential and secure.

Is it really free and unlimited?

Yes. Lifetime free, unlimited conversions, and no sign ups. Top, fast, and best-in-class.

Which units are supported?

L, mL, m³, US gal/qt/pt/cup (legal)/fl oz/tbsp/tsp, Imperial gal/qt/pt/cup/fl oz/tbsp/tsp, ft³, and in³.

US vs UK gallons what’s the difference?

1 US gallon = 3.78541 L; 1 UK (Imperial) gallon = 4.54609 L. Make sure to select the right system.

How many mL in a tablespoon?

US tablespoon = 14.7868 mL. Imperial tablespoon = 17.7582 mL.

How many cups in a liter?

US legal cup: 1 L ≈ 4.1667 cups. US customary cup: 1 L ≈ 4.22675 cups. Your selection matters.

Does it work offline?

Yes. Your browser can cache assets after the first visit and run offline.

How accurate are results?

We use precise conversion constants with sensible rounding for readability.

Global availability (GEO)

Built for users worldwide: USA, UK, Canada, Australia, India, EU (Germany, France, Spain, Italy, Netherlands), Middle East (UAE, Saudi Arabia), Asia (Singapore, Malaysia, Philippines, Indonesia, Japan, South Korea), Africa (Nigeria, South Africa, Egypt), and Latin America (Brazil, Mexico, Argentina).

Also searched as: Volume unit converter, convert liters to gallons, L to gal, gal to L, mL to fl oz, fl oz to mL, cups to mL, pints to liters, quarts to liters, cubic inches to liters, ft³ to liters, UK gallon to liter, US gallon to liter.
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