Triangle Scale Calculator

Scale a triangle’s base and perpendicular height by the same non-negative factor. The output shows the new base followed by the new height.

How to use Triangle Scale Calculator

1. Choose Measurement Unit, then enter Base, Height, 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 base and height. 4. Select Select Copy result to copy the answer, or Reset to clear the form.

Why use this tool?

Resize a triangular layout while preserving its proportions and perpendicular height relationship.

How the calculation works

New base = base × factor and new height = height × factor. A uniformly scaled triangle’s area changes by factor². 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

Base = 10 cm, Height = 6 cm and Scale Factor = 2 give 20 × 12 cm. Its area grows from 30 cm² to 120 cm².

Practical tip

Use a multiplier such as 1.2 for a 20% length increase. The height remains perpendicular to the base.