Tools
Fileraz
Tools
Fileraz
Try jpg to png, compress image, pdf…
Construction Calculator
Rule-of-thumb site math, reviewed October 2026 — first-pass material estimates, not a bill of quantities or a code check. Confirm with your contractor or engineer.
Your files never leave your device
Check your Network tab and see
Work starts the moment you drop a file
No daily limit, no sign-up, no watermark
Area is length × width; perimeter is 2 × (length + width). On a pitched roof the length along the slope is longer than the building's plan length — using the plan figure under-orders sheets. Overhangs add area; hips and valleys add cuts. For floor paint or tiles inside a room, use the room-area calculator instead.
On a pitch, enter the true slope length, not the building's plan length, or sheeting comes up short. Overhangs belong in the lengths you type. L-shapes, hips, valleys, and dormers are not auto-split — run each rectangle. Do not use this page for interior flooring or skirting.
It does not derive slope length from rise and run, split hips and dormers, or measure indoor floors — for flooring and skirting, the room page is the right tool.
Rectangles only — slope length must be measured, not derived.
Only for a flat roof. For a pitch, measure along the slope (or compute it from rise and run) so the sheeting length is not short.
Tape along the slope from eave to ridge, or measure rise and run and compute √(rise² + run²) — the hypotenuse is the sheeting length.
Add a cutting allowance (commonly around 10%) on top of the net area — hips and valleys waste more sheet than a plain gable.
No. Dimensions stay on your device.
That is the promise behind every tool here. Files are read in your browser tab, processed there, and discarded when you close it — never uploaded to our servers.