Rectangle Scale Factor Calculator
The Rectangle Scale Factor Calculator resizes a rectangle by a scale factor and shows the new dimensions, plus how the perimeter and area change. Enter the original size and scale factor.
Formula
New side = old side × k; Perimeter scales by k; Area scales by k²
- Lengths scale linearly with the scale factor.
- Area scales by the square of the scale factor.
8 × 5 scaled by 1.5
Inputs
- Length: 8
- Width: 5
- Scale Factor: 1.5
New size 12 × 7.5; area grows by 1.5² = 2.25 times.
Frequently asked questions
How does area change when you scale a rectangle?
Area scales by the square of the scale factor, so doubling the sides quadruples the area.