Rectangle Scale Factor Calculator
Rectangle Scale Factor with explicit inputs, formulas and domain checks.
Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Uniform scaling preserves the aspect ratio.
Example Calculation
- Original length: 4 units
- Original width: 3 units
- Target length: 8 units
Scaling a4×3 rectangle to length8 gives width6, linear factor2 and area factor4.
Frequently asked questions
How do I use this calculator?
Enter original length, original width, target length. The result updates automatically. Use Reset to restore the example values.
What method does it use?
linear scale k=target length/original length; width′=k width; area factor=k².. Uniform scaling preserves the aspect ratio.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.