Seam Allowance Calculator
Add an equal allowance to all four sides of a rectangular pattern.
Tool Operation Area
Add an equal allowance to all four sides of a rectangular pattern.
Worked Example
Finished width: 20 cm; Finished height: 15 cm; Allowance per side: 1 cm.
Cut width: 22 cm; Cut height: 17 cm; Result: 374 cm².
How It Works
- Cut width = finished width + twice the allowance; cut height is calculated the same way. The result is the resulting area.
- Cut dimensions are the finished dimensions plus twice the allowance on each axis.
Cut width = finished width + twice the allowance; cut height is calculated the same way. The result is the resulting area.
How to Use
- 1Enter finished width in cm.
- 2Enter finished height in cm.
- 3Enter allowance per side in cm.
- 4Select Calculate to see the result.
FAQ
Is this an exact workshop measurement?
Cut dimensions are the finished dimensions plus twice the allowance on each axis.
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