Ratio and Proportion Calculator
Simplify ratios, resize proportionally, convert map scales and split totals.
Simplify, resize, scale and split
- Simplify turns any pair like 1920 : 1080 into 16 : 9 with its decimal value.
- Resize finds the missing side: keep 1920 × 1080 and set width 1280 to get height 720.
- Map scale converts drawing centimeters to real meters at 1:N, and split divides a total by parts like 5 : 3 : 2.
Ratio questions
What is the difference from the aspect-ratio tool?
Aspect ratio resizes image and video frames. This tool simplifies any ratio, converts drawing scales and splits totals — then links to pixels and print size.
How do I read 1:50 with 3.2 cm on paper?
Use map scale: 1:50 plus 3.2 cm gives 1.6 real meters. Swap sides to go from real size back to drawing.
Does the split always add up to the total?
Yes: cents lost to rounding go to the last share, so R$10,000 in 5 : 3 : 2 lands exactly on R$5,000 / R$3,000 / R$2,000.