🗺️ Scale Calculator
Convert between map distance, real-world distance, and map scale.
Enter any two values (map distance, real distance, or the representative fraction) to compute the third. Switch between centimeters and inches depending on the map units.
Leave blank to solve for map distance.
Use same units as the scale denominator result (e.g., cm or inches).
Enter the representative fraction (e.g., 5000 for 1:5000).
Map Distance (centimeters)
5
Real Distance (centimeters)
25,000
Scale (1 : n)
5,000
How to Use This Calculator
Provide any two values
Enter map distance, real distance, or scale. Leave one blank to solve for it. Ensure the other two values are positive.
Pick map units
Choose centimeters or inches to match your map’s measurement. Real distance is returned in the same units.
Use the results
Copy the map distance for drawing measurements, real distance for field work, or scale for legends and documentation.
Formula
Real Distance = Map Distance Ă— Scale Denominator
Map Distance = Real Distance Ă· Scale Denominator
Scale (1 : n) = Real Distance Ă· Map Distance
Use the formula breakdown to confirm the calculation logic or perform the conversion manually if needed.
Full Description
The scale calculator streamlines conversions between map measurements and real-world distances. It supports representative fractions (1:n) and works with centimeters or inches, making it useful for cartographers, planners, and hobbyists working with printed maps.
By entering any two values, you can solve for the third—ideal when preparing map legends, reconciling field notes, or verifying scale accuracy.
Combine this calculator with the Coordinates Converter or Lat Long to UTM Converter for comprehensive map prep and validation workflows.
Frequently Asked Questions
Can I mix units (cm and inches)?
No. Keep units consistent. If your map uses inches, select inches and convert real-world distances to inches before input.
How do I convert to kilometers or miles?
First compute the real distance in centimeters or inches, then convert using standard unit conversions (e.g., 100,000 cm = 1 km).
What if my map distance is zero?
Map distance must be positive to compute scale. A zero value is invalid and will yield no result.
Can I use metric scales like 1:25,000?
Yes. Enter 25000 as the scale denominator. If you know the real distance, the calculator returns the map distance accordingly.