Calculator
What the Volume Converter does
Volume Converter: 1 L = 0.26417205 gal, so multiply a litre value by 0.26417205 to get gallon (US), or divide to go back. Example: 1 L = 0.26417205 gal.
The Volume Converter turns Value, From and To into Result, How it was calculated and Reverse conversion. Change any input and the output follows immediately.
Converting once from the original figure beats chaining approximations. That is usually what brings engineers checking a datasheet here.
The work is done by JavaScript already loaded in your browser, so your input never crosses the network.
Everything needed to verify a result is further down: the fields, the method and one fully worked example.
What do the Volume Converter fields mean?
The Volume Converter uses 3 inputs. None of the boxes start empty. The page loads with a worked set of values you can edit or replace.
| Field | What to enter | Default |
|---|---|---|
| Value | required | 1 |
| From | choose from Millilitre (mL), Centilitre (cL), Litre (L), Cubic metre (m³), Cubic centimetre (cm³) or Cubic inch (in³) | Litre (L) |
| To | choose from Millilitre (mL), Centilitre (cL), Litre (L), Cubic metre (m³), Cubic centimetre (cm³) or Cubic inch (in³) | Gallon (US) (gal) |
How does the Volume Converter work?
Both units are converted through volume's base unit (L), so any of the 19 units in the dropdowns can be paired in either direction without loss of accuracy.
Where a unit has an exact legal definition, that exact value is used rather than a rounded one. The 1959 international agreement fixing the inch at 25.4 mm is the best-known example; the same principle applies throughout.
Worked example
These are the values the Volume Converter loads by default, and the result it produces from them. Open the tool above and you will find precisely these figures already in place.
| Value | 1 |
|---|---|
| From | Litre (L) |
| To | Gallon (US) (gal) |
| Result | 0.26417205 gal |
|---|---|
| How it was calculated | 1 L = 0.26417205 gal, so 1 × 0.26417205 = 0.26417205 gal |
| Reverse conversion | 3.785411784 L (if you meant 1 gal) |
Metric, US and imperial volume
Volume has three overlapping systems in everyday use: the metric litre, US customary units (gallon, quart, cup), and UK imperial units, and the US and imperial versions of the "same" unit are not the same size, which is the single biggest trap in this category.
Worth knowing
- The US gallon (3.785411784 L) and the UK imperial gallon (4.54609 L) differ by about 20%. An imperial gallon is genuinely bigger, not just measured differently, so a "gallon" figure needs its country of origin before it can be trusted.
- That same US/imperial split cascades down into quarts, pints and fluid ounces, since those are all defined as fractions of their respective national gallon.
- The litre and its metric multiples (millilitre, cubic metre) are unambiguous worldwide: the complexity only appears when converting to or from the US/imperial customary units.
Definitions: BIPM SI Brochure · NIST reference on units
Read next: Unit Conversion Mistakes That Have Destroyed Real Things
How to use it
- Key in Value.
- Pick a value for From: the options are Millilitre (mL), Centilitre (cL), Litre (L), Cubic metre (m³), Cubic centimetre (cm³) or Cubic inch (in³).
- Pick a value for To: the options are Millilitre (mL), Centilitre (cL), Litre (L), Cubic metre (m³), Cubic centimetre (cm³) or Cubic inch (in³).
- There is nothing to click. The answer keeps pace with your edits.
- Read Result, How it was calculated and Reverse conversion in the results panel.
- Use Copy Link if you want the same setup again later, or Print for a paper copy.
What this tool does not do
- Conversion factors use SI definitions; some industries use their own rounded factors.
- Repeated conversions compound rounding, so convert once from the original value where possible.
- No allowance is made for local rules, regional variations or house conventions.
- A number that passes validation has been checked for plausibility, not for correctness.
Frequently asked questions
Just Value, From and To. Each field is pre-filled with a sensible default, so the form is usable immediately, without filling anything in first.
With the values loaded when the page opens, result comes out as 0.26417205 gal. Nudge one field at a time to see which one the answer is most sensitive to.
No. There is no account, no session and no storage. The values exist only while the tab is open.
Free for any use, personal or commercial.
There is no estimation step. The result is computed, not inferred.