THE NUMBERS, EXPLAINED
How to use this calculator.
Fabric wraps across the frame depth and then the entered rear gripping margin on all four edges. Shrinkage and trimming reserve must be added to your measurements.
Start with your inputs
Enter canvas frame width (cm), canvas frame height (cm), frame depth (cm), rear grip margin per edge (cm). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Canvas frame width (cm) | 40 |
| Canvas frame height (cm) | 30 |
| Frame depth (cm) | 2 |
| Rear grip margin per edge (cm) | 3 |
A worked example
With the example inputs above, raw canvas cut width (cm) is 50. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Raw canvas cut width (cm) | 50 |
| Raw canvas cut height (cm) | 40 |
| Raw canvas area (square cm) | 2,000 |
How this is calculated
Raw canvas cut width (cm)
Add depth plus grip margin on both sides.
Raw canvas cut height (cm)
Add depth plus grip margin at top and bottom.
Raw canvas area (square cm)
Multiply raw cut dimensions.
Symbols and units
- a
- Canvas frame width (cm)
- b
- Canvas frame height (cm)
- c
- Frame depth (cm)
- d
- Rear grip margin per edge (cm)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions and limits
Fabric wraps across the frame depth and then the entered rear gripping margin on all four edges. Shrinkage and trimming reserve must be added to your measurements.
Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.
Questions about this tool
What does the result tell me?
Raw canvas cut width (cm); Raw canvas cut height (cm); Raw canvas area (square cm). The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.
Why might another calculator differ?
Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: Fabric wraps across the frame depth and then the entered rear gripping margin on all four edges. Shrinkage and trimming reserve must be added to your measurements.
Are my inputs stored or sent to AI?
Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.
Further reading
OpenStax Prealgebra 2e — arithmetic and proportions ↗
Background reading; this does not imply endorsement or independent review of SumFizz.
Review status
Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.
Read the quality report →