Builder Calculators
Everyday tools for builders and site managers.
13 tools · Top 13 most used · 100% Free
Quick take-off and estimating tools for builders, chippies and site managers pricing residential and light-commercial jobs. The tricky part is that the same wall or roof drives several counts at once, so ordering studs, sheets, fixings and concrete from one measurement means using calculators that share your set-out dimensions rather than guessing each trade in isolation. Treat every count as an estimate: allow for waste, offcuts, spacing rules and site conditions before you place the order.
Slab, footings and reinforcement
Start with slab volume to order your concrete by the cubic metre, then use rebar weight to price steel and confirm bar quantities against your spacing.
Framing and stairs
Use the stud calculator to count wall framing at your chosen spacing; for stairs, the stair calculator works out rise, going and step count while the stringer calculator sizes and cuts the strings.
Roofing take-off
Work out roof area first for a like-for-like comparison of options, then run the sheet calculator to convert that area into cladding runs and quantities.
Linings, floors and decks
Plasterboard for internal linings, then flooring or decking depending on whether the surface is inside or an outdoor deck where board gaps and joist spacing change the count.
Brickwork, fencing and boundaries
Estimate bricks (and mortar) for walls, and use the fence calculator for post, rail and paling counts along a run before pricing materials.
Common tasks
- Ordering concrete and reinforcement for a slab
- Counting studs, plates and stair timber for framing
- Working out roof area and cladding sheets
- Estimating plasterboard, flooring and decking coverage
- Pricing bricks, mortar and fence materials for a run
Top 13 Calculators for builders
Concrete Slab Volume Calculator
Concrete and reinforcement
Use Calculator2Brick Wall Calculator
Estimating & materials
Use Calculator3Stair Calculator
Layout & framing
Use Calculator4Stair Stringer Calculator
Estimating & materials
Use Calculator5Roof Area Calculator
Estimating & materials
Use Calculator6Roof Sheet Calculator
Estimating & materials
Use Calculator7Wall Framing Stud Calculator
Estimating & materials
Use Calculator8Plasterboard Sheets Calculator
Estimating & materials
Use Calculator9Flooring Calculator
Materials & coverage
Use Calculator10Decking Calculator
Materials & coverage
Use Calculator11Fence Calculator
Estimating & materials
Use Calculator12Rebar Weight Calculator
Estimating & materials
Use Calculator13Rectangle Area Calculator
2D shape calculators
Use Calculator