Volume converter

Enter a value, choose its current unit and select the target unit. The table shows equivalent values within the same physical quantity. Signed values are supported; conversion does not change the meaning of a negative measurement.

1 m³ = 1000 L; 1 L = 1000 mL = 1,000,000 mm³

Length, area and volume are different quantities. Area factors are squared and volume factors are cubed. Millimetres cannot be converted directly to litres; cubic millimetres can. If you meant millilitres, 1000 mL equals 1 L.

Millimetres, millilitres or container depth?

A litre is 1000 millilitres (mL) or 1,000,000 cubic millimetres (mm³), not a fixed number of millimetres (mm). Choose container dimensions when you mean the depth of liquid.

For an upright container with constant cross-section, litres = internal base area in mm² × fill depth in mm / 1,000,000. Rectangular area = length × width; circular area = π × diameter² / 4. Reverse the formula to find fill depth from litres.

A 100 × 100 mm base holds 1 L at 100 mm depth; a 200 × 100 mm base holds 1 L at 50 mm depth. Use inside dimensions and measure depth vertically. This model excludes tapered, horizontal cylindrical or irregular containers, wall thickness and displaced objects. It does not check overflow against the container’s height.

US and UK gallons and fluid ounces have different definitions. Choose the explicitly labelled system. These are volume units, not mass units; converting litres to kilograms requires density.

Reference: NIST SI conversion factors

The result above uses these exact values. This snapshot is included when the page is printed so the output can be checked against the original measurements.

Volume input

Convert volume units

Value

1

From unit

m³

To unit

L

Primary result: Converted value: 1000 L.

• Check the selected mode, units and input values before using the result.
• Read the assumptions and rounding rules; compare the worked example with your intended calculation.
• A numerical result does not supply missing context or change the stated limitations.

Results use floating-point arithmetic and are displayed to ten significant digits. This tool does not measure an object, infer missing dimensions or supply material density. Keep unrounded values for further calculations when precision matters.