Free tools
Free roofing calculators and planning tools.
Three tools, no gate at the end. Each one states what it calculates, what it cannot know, and the version of the model behind the number.
- Tool 01Use the repair cost calculator
Repair cost calculator
Six common repair types, entered by the amount of repair rather than the size of the house.
You get: A low-to-high planning range with the inclusions, exclusions and assumptions behind it.
About 2 minutes. Runs in your browser.
- Tool 02Compare written roofing quotes
Written quote comparison
Enter two to four written quotes by hand and see them side by side. Nothing is uploaded.
You get: Totals, absolute and percentage differences, scope mismatches and the questions to ask.
Stays in your browser.
- Tool 03Calculate roof area
Roof area calculator
Footprint length, width and pitch, using a rectangular gable approximation with the formula shown.
You get: Estimated roof surface in square feet or square metres, plus roofing squares.
Ground measurements only.
Consistent calculations
The same inputs always produce the same result, so you can compare two scenarios and trust the difference.
Assumptions printed
Rate bands, access factors, minimum charges and rounding are shown on the result and explained on each tool page.
Stays on your device
Your entries are kept in your browser's own storage so they survive a reload. Nothing is sent to us and there is no account. Rates are national planning assumptions, not prices for your area.
What none of these tools can do
They cannot inspect your roof, verify a contractor, or price your specific job. They turn the information you have into a structured range and a set of questions, so that a conversation with a professional starts somewhere useful. Read the methodology.