These free area and volume converters switch between square feet and square metres, cubic metres, litres, UK and US gallons, feet and inches, centimetres and inches, and tonnes or cubic metres of aggregate.
Quick answer: Choose the converter, enter the value and pick the direction. Every converter uses exact legal definitions, such as 1 inch equals 2.54 cm and 1 UK gallon equals 4.54609 litres, and shows the working so you can check the result.
Why Do UK and US Gallons Differ?
A UK gallon is 4.54609 litres while a US gallon is about 3.785 litres, so a UK gallon is roughly 20% larger. The litres to gallons converter asks which one you mean.
How Do You Convert Tonnes of Gravel to Cubic Metres?
Divide the weight by the loose bulk density: gravel is typically about 1.6 tonnes per cubic metre, so 1 tonne covers about 0.63 m³. Densities vary by material, so the aggregate converter lets you enter your supplier figure.
Which Area and Volume Converters Do You Need?
Pick the area and volume converter that matches the units you have and the units you need, enter the number and choose the direction.
| Tool | What it works out |
|---|---|
| Square Feet to Square Metres Converter | Converts square feet to square metres, or square metres to square feet, with yards and acres. |
| Cubic Metre Calculator | Works out volume in cubic metres for boxes, rooms and cylinders, plus litres and cubic feet. |
| Litres to Gallons Converter | Converts litres to UK or US gallons and back, with pints and cubic metres shown. |
| Feet and Inches to Metres Converter | Converts feet and inches to metres and centimetres, or metres back to feet and inches. |
| Cm to Inches Converter | Converts centimetres to inches and back, with fractions to the nearest sixteenth and feet. |
| Tonnes to Cubic Metres Aggregate Converter | Converts tonnes of sand, gravel, sub-base or topsoil to cubic metres and back, with coverage. |
How Our Area and Volume Converters Work
Plans, product labels and old house deeds often mix imperial and metric units. These area and volume converters use exact legal factors and show every step, so the answer can be checked by hand.
Exact factors, such as 1 foot equals 0.3048 metres and 1 UK gallon equals 4.54609 litres, are set out in the Weights and Measures Act 1985. Aggregate conversions depend on material density and are labelled as estimates.
Tips for Accurate Results With Our Area and Volume Converters
- Convert lengths first and then work out area or volume, to avoid rounding errors.
- Remember that area factors are squared: 1 metre is 3.28 feet, but 1 square metre is 10.76 square feet.
- Volume factors are cubed: 1 cubic metre is 35.31 cubic feet and 1,000 litres.
- Say which gallon you mean. A UK gallon is 4.546 litres, a US gallon is 3.785 litres.
- Ask your supplier for the bulk density when converting tonnes of aggregate to cubic metres.
Common Mistakes to Avoid
- Using a length factor for an area. That understates square metres by a factor of about 3.
- Mixing UK and US gallons on old plans and product labels.
- Rounding fractions of an inch too early when converting to centimetres.
- Assuming every aggregate weighs the same. Area and volume converters label density-based answers as estimates.
See the Calculators in Action
Each tool shows the formula, your result and a worked example. Here is what a few of these area and volume converters look like.
Area and Volume Converters FAQs
Are these conversions exact?
Unit conversions such as feet to metres and square feet to square metres use exact defined factors. Aggregate conversions depend on material density, so they are estimates that the converter labels clearly.
How many square feet are in a square metre?
One square metre equals about 10.764 square feet, because 1 square foot is exactly 0.09290304 square metres.
Can I convert room sizes for flooring?
Yes. Convert the room area here, then use the flooring calculators to work out packs, wastage and cost for laminate, vinyl, carpet or tiles.
For room projects, try the laminate flooring calculator or see every category on our home calculators page.