Rectangle Scale Calculator
Multiply a rectangle’s length and width by the same non-negative scale factor. The output shows the new length followed by the new width.
How to use Rectangle Scale Calculator
1. Choose Measurement Unit, then enter Length, Width, 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 rectangle dimensions. 4. Select Select Copy result to copy the answer, or Reset to clear the form.
Why use this tool?
Resize a rectangular layout or drawing while preserving its proportions.
How the calculation works
New length = length × factor; new width = width × factor. Perimeter scales by the factor, while area scales 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
Length = 12 cm, Width = 8 cm and Scale Factor = 2 give 24 × 16 cm.
Practical tip
For a drawing at half size use 0.5. To enlarge each length by 25%, use 1.25.
Frequently asked questions
What does Scale Factor = 1 mean?
The dimensions stay the same. A factor between zero and one shrinks them; a factor greater than one enlarges them.
Does a factor of 2 double the rectangle area?
It doubles both sides, so the area becomes four times as large. The output here contains side lengths.
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.