Scale factor
Target width ÷ reference width gives the enlargement or reduction. A 2× result means every distance doubles.
Free drawing scale tool
Drawing Proportion Calculator
Scale a gridded reference to any canvas, paper, panel, or wall. Get the exact enlargement percentage and the real spacing for every target cell before you draw.
Exact cell dimensions Distortion warning Share and print
Scale & grid calculator
Exact transfer sizes, without guesswork
01
Reference size
Measure the image or use any same-unit width and height.
02
Target size
Enter the canvas, paper, wall, or panel you will draw on.
03
Grid & units
Columns divide the width; rows divide the height.
Enlargement
2× scale
200% of the reference size
Target cell size
2 × 2 in
8 columns × 10 rows
Reference cell size
1 × 1 in
Use the same cell address on both grids
Target grid preview8 × 10
Settings are included in the share link.
Three measurements
From reference to canvas in one calculation
Use the same unit for the reference and target. The ratio determines the scale; rows and columns determine where every line belongs.
- 01
Measure both sizes
Enter the reference and the target width and height.
- 02
Choose a grid
Set columns and rows that give you useful drawing cells.
- 03
Mark the canvas
Use the target cell width and height to place each line.
What the numbers mean
Keep scale and grid spacing separate
Cell dimensions
Target width ÷ columns gives each cell's width; target height ÷ rows gives its height.
Aspect ratio
Width and height must change by the same factor. If they do not, the transferred drawing will stretch.
Ready to grid the reference?
Upload the image, apply the same rows and columns, and download both the gridded reference and matching blank grid.
Open Drawing GridLearn the full grid method
See how to choose a useful grid, copy one cell at a time, scale accurately, and remove construction lines cleanly.
Read the guide