Canvas Size Calculator
Canvas dimensions from golden ratio and standard sizes.
About this calculator
This calculator turns a target canvas width and height into everything else you need to plan a stretch: paintable surface area (in both square inches and square feet), the raw aspect ratio, and companion dimensions sized to the golden ratio (1.618) in case you want to compare your chosen proportions to that classical standard — it reports what the width would need to be to hit golden ratio at your given height, and vice versa for height against your given width. For the physical build, it sums the four sides of the frame into a total stretcher-bar length and estimates the raw canvas fabric needed by adding your stretcher-bar depth (1.5 inches is typical gallery wrap, 0.75 inches standard) plus a fixed 2-inch staple allowance to each edge, then multiplying that padded width and height together — this is the fabric footprint before it gets folded and stapled around the bars, not just the visible face.
Multiply by how many canvases you're prepping to get total fabric needed in square feet for a bulk roll purchase. A few things to keep in mind: the fabric estimate assumes a simple four-side wrap with no pattern-matching or extra trim for canvases with printed or patterned material, and it doesn't account for the corner miter waste that comes from folding gallery-wrap corners cleanly, so buy a little more fabric than the raw number suggests, especially on larger or deeper stretches.
Inputs
Results
Surface Area
320 sq in
≈ 3 sheets of paper
How to Use This Calculator
- Enter Canvas Width, Canvas Height, and Stretcher Depth.
- Set Number of Canvases.
- Review the Surface Area (sq in) result.
- Use Surface Area (sq ft) and Aspect Ratio to inform your decision.
How the result changes with Canvas Width
| Canvas Width | Surface Area |
|---|---|
| 8 | 160 sq in |
| 12 | 240 sq in |
| 24 | 480 sq in |
| 40 | 800 sq in |
What each input means
- Canvas Width
- Desired canvas width in inches.
- Canvas Height
- Desired canvas height in inches.
- Stretcher Depth
- Stretcher bar depth. Gallery wrap is typically 1.5 in, standard is 0.75 in.
- Number of Canvases
- How many canvases to prepare.
What each result means
- Surface Area
- Paintable face area per canvas.
- Surface Area
- Paintable face area in square feet.
- Aspect Ratio
- Width-to-height ratio of the canvas.
- Golden Ratio Width
- Width to achieve golden ratio (1.618) with the given height.
- Golden Ratio Height
- Height to achieve golden ratio with the given width.
- Stretcher Bar Length
- Total linear inches of stretcher bar needed.
- Fabric per Canvas
- Raw canvas fabric needed per canvas including wrap and staple allowance.
- Total Fabric Needed
- Total fabric for all canvases in square feet.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersCanvas Width = 16, Canvas Height = 20, Stretcher Depth = 1.5, Number of Canvases = 1 = 4 input(s) provided
- Calculate Surface AreaSurface Area = width * height320 = 320
- Calculate Surface AreaSurface Area = surfaceAreaSqIn / 1442.22 = 2.22
- Calculate Aspect RatioAspect Ratio = width / height0.8 = 0.8
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why does the calculator give me both a Golden Ratio Width and a Golden Ratio Height?
They answer two different questions: Golden Ratio Width is what your width would need to be, keeping your entered height fixed, for the canvas to sit at the classical 1.618 proportion, while Golden Ratio Height does the reverse for your entered width. You'd typically look at whichever one is closer to a size you could actually use, rather than treating both as instructions to change.
Why is the fabric needed so much larger than my canvas's surface area?
Fabric per Canvas isn't the visible face — it's the padded footprint before wrapping. The calculator adds your stretcher depth plus a fixed 2-inch staple allowance to each of the four edges, then multiplies that larger width and height together, so a 16x20 canvas on a 1.5-inch gallery-wrap bar needs fabric closer to 23x27 inches once you account for the material that folds around the sides and gets stapled to the back.
Should I buy exactly the amount of fabric the calculator recommends?
No, buy a little extra. The fabric formula assumes a clean four-side wrap and doesn't add anything for the corner-miter waste that comes from folding gallery-wrap corners neatly, or for pattern-matching on printed or patterned canvas — both of which eat into your margin, especially on deeper stretcher bars.
Does changing the stretcher depth affect the stretcher-bar length or just the fabric?
Only the fabric. Stretcher Bar Length is just the perimeter of your width and height (2 times width plus height) regardless of depth, since that's the linear footage of bar stock you need to cut. Depth only shows up in the fabric calculation, where a deeper bar means more material has to wrap around the sides before it reaches the staples on the back.
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