Fill in any two of length, height and area, then click Calculate. The tool uses Area = Length × Height to compute the remaining value automatically.
This calculator is based on the rectangle area formula: Area = Length × Height. Knowing any two of these lets you solve for the third.
If you know length and height, Area = Length × Height. If you know area and length, Height = Area ÷ Length. If you know area and height, Length = Area ÷ Height.
Rectangle area is widely used in floor planning, land measurement, graphic design, packaging and many other scenarios. This tool lets you perform these conversions quickly.
Make sure all values are greater than 0 and use consistent units (for example, all in meters, centimeters or millimeters) so the result remains meaningful.
Area = Length × Height.
Area = 5 × 3 = 15 m².
Length = Area ÷ Height = 20 ÷ 4 = 5 m.
Only consistent units produce meaningful area values; mixing units leads to wrong results.
A square is a special rectangle with equal sides, so Area = side × side.
You can compute the floor area from room length and width to estimate material quantities.
No. This tool relies on Area = Length × Height and needs any two among length, height and area.
Yes. All three fields accept decimals for more precise calculations.
Students, teachers, engineers, designers and anyone who needs rectangle area conversions.
Length and height represent physical dimensions and must be positive; negative values have no geometric meaning.
This tool helps you find the third value when any two of length, height and area of a rectangle are known. Useful for learning, design and daily calculations.
Scan the QR code to use this tool on mobile.