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Window opening measurement worksheet
Turn three-point opening measurements into an installer’s nominal frame worksheet.
01Enter your values
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02Window opening measurement worksheet
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How it works
Turn three-point opening measurements into an installer’s nominal frame worksheet.
W = min(w₁,w₂,w₃) − Gₓ; H = min(h₁,h₂,h₃) − Gᵧ; Δd = |d₁−d₂|
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Inputs are processed on this page and are never sent to a server.
About this tool
Use tool ↑Turn three-point opening measurements into an installer’s nominal frame worksheet.
Enter three widths and three heights in millimetres, separated by spaces; use a dot for decimals. Subtract your manufacturer’s TOTAL horizontal and vertical clearances from the smallest measurements. Enter both diagonals to report their difference. Example clearances are not specifications. For rectangular in-opening installation only; not overlapping or behind-reveal frames.
How to use it
- Enter your values
Width measurements · Height measurements · Total horizontal clearance · Total vertical clearance · First diagonal · Second diagonal
- Calculate / generate
Turn three-point opening measurements into an installer’s nominal frame worksheet.
- Result
Nominal frame dimensions: 1,188 × 1,488 mm Not a fit approval: check square, plumb, depth and manufacturer instructions.
Calculation method
W = min(w₁,w₂,w₃) − Gₓ; H = min(h₁,h₂,h₃) − Gᵧ; Δd = |d₁−d₂|
Window opening measurement worksheet
- Width measurements
- 1200 1198 1201 mm
- Height measurements
- 1500 1498 1500 mm
- Total horizontal clearance
- 10 mm
- Total vertical clearance
- 10 mm
- First diagonal
- 1920 mm
- Second diagonal
- 1922 mm
Result
Nominal frame dimensions: 1,188 × 1,488 mm Not a fit approval: check square, plumb, depth and manufacturer instructions.
Frequently asked questions
Do equal diagonals prove the window will fit?
No. The worksheet cannot reconstruct a warped opening. Check square, plumb, sill, depth and installation instructions before ordering; it does not calculate an out-of-square correction.
Where does my data go?
Calculations run on your device. Form inputs are not sent to a server.