Canvas Size Calculator

Enter your reference photo's dimensions and find the standard canvas sizes that match its proportions - no cropping surprises, no distorted drawings.

Your reference (photo or sketch)

Only the proportions matter - pixels, inches, or cm all work.

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Your reference's aspect ratio is 1.250 (5:4). Pick a canvas below with a close match to avoid cropping or distortion.

Best-matching standard canvases

  • 10″ × 8″(most popular portrait)exact match
  • 20″ × 16″exact match
  • 30″ × 24″exact match
  • 14″ × 11″1.8% off
  • 24″ × 20″4.0% off
  • 12″ × 9″6.7% off

A "% off" under ~2% is safe - the difference disappears inside the margin. Larger mismatches mean cropping your reference or stretching proportions.

🔒 Print-ready summary sheet (A4) - Pro

Found your canvas? Next steps

  1. Add a grid to your reference with the free Photo Grid Maker.
  2. Work out your grid square sizes with the Proportion Calculator.
  3. Going bigger than a canvas? Scale to a wall with the Mural Scaling Calculator.

How to choose a canvas size

Start from your reference, not the canvas. Calculate the reference's aspect ratio (width ÷ height), then choose a standard canvas whose ratio matches. This keeps every grid cell square when you transfer with the grid method, so proportions land exactly where they should. When in doubt between two sizes, take the larger one - detail is easier to add at scale and the finished piece presents better.

Frequently asked questions

What are the standard canvas sizes?
Common stretched-canvas sizes include 8×10, 9×12, 11×14, 12×16, 16×20, 18×24, 24×30, 24×36, and 30×40 inches, plus squares like 8×8, 12×12, and 20×20. The calculator above ranks these by how closely they match your reference's proportions.
Why does my canvas need to match my reference's aspect ratio?
If the proportions differ, you must either crop your reference or stretch the drawing - stretching distorts every shape, which is especially noticeable in portraits. Matching ratios means the grid method transfers cleanly with square cells.
What canvas size should a beginner start with?
9×12 or 11×14 inches is a sweet spot: large enough to work comfortably, small enough to finish. Pair it with a reference cropped to the same ratio and a simple 4×5 or 6×8 grid.
What if no standard canvas matches my reference?
Crop the reference to the nearest standard ratio (easiest), order a custom-stretched canvas, or accept a small mismatch under about 2% - at that level the difference disappears into the margins.

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