Right Triangle Scale Calculator
Scale the two perpendicular legs of a right triangle by the same non-negative factor. The right angle and proportions are preserved.
How to use Right Triangle Scale Calculator
1. Choose Measurement Unit, then enter Leg A, Leg B, Scale Factor without a unit suffix. 2. Use the selected ordinary, square or cubic unit for each measurement as explained below; changing the selector relabels inputs and does not convert them. 3. Select Calculate, or press Enter, and read scaled right triangle. 4. Select Select Copy result to copy the answer, or Reset to clear the form.
Why use this tool?
Resize a right-angled triangular drawing while checking the new leg lengths.
How the calculation works
New leg A = leg A × factor and new leg B = leg B × factor. The hypotenuse also scales by this factor, but is not displayed here. Results use up to six decimal places. Tiny nonzero results below 0.000001 use scientific notation with six significant digits. Browser floating-point arithmetic can introduce small rounding differences. Inputs and calculated magnitudes must not exceed 9,007,199,254,740,991. Negative physical measurements and arithmetic underflow are rejected. Zero dimensions are treated as a degenerate limit where the formula allows them; divisors and sides of an actual triangle must be positive. Formula reference: https://openstax.org/books/prealgebra-2e/pages/c-geometric-formulas
Example
Leg A = 6 cm, Leg B = 8 cm and Scale Factor = 2 give 12 × 16 cm, in leg A then leg B order.
Practical tip
Use the related missing-dimension tool on the new legs if you also need the new hypotenuse.
Frequently asked questions
Does the output include the hypotenuse?
No. It shows the scaled leg A × scaled leg B. For this example, the scaled hypotenuse would be 20 cm.
How does scaling change area?
Area changes by the square of the factor. A factor of 0.5 halves the legs and gives one quarter of the original area.
Does changing Measurement Unit convert my numbers?
No. The selector states the unit of the numbers you enter and labels the answer. Convert measurements first when changing units. Area inputs use square units and volume inputs use cubic units; result precision follows the rounding method above.