Map Scale Calculator
Convert map distances to real distances and vice versa for common UK Ordnance Survey map scales.
Which way to convert
Scale of your map
Distance measured on the map
Unit of your map measurement
How We Calculate This
Conversion Formula
Real distance = Map distance x Scale factor
At 1:25,000, every 1mm on the map represents 25m on the ground. At 1:50,000, every 1mm represents 50m.
Quick Reference
- 1:25,000 — 4cm = 1km
- 1:50,000 — 2cm = 1km
- 1:10,000 — 10cm = 1km
Frequently Asked Questions
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Last updated: March 2026
All calculations are estimates. Always verify conditions and use proper safety equipment outdoors.