Free construction calculators

Instant material estimates for concrete, tiles, bricks, rebar and more. Metric and imperial, no sign-up needed.

Most used

Concrete calculator

Volume for slabs, walls, columns and footings

LengthWidthDepthWaste %
3.0m³5×4×0.15m

Concrete bag calculator

40lb, 60lb, 80lb bag count for any pour

LengthWidthDepth
45bags80lb @ 10×10ft

Tile calculator

Tile count, box quantity and grout joints

Room sizeTile sizeGrout
112tiles4×3m, 60×60cm

Brick calculator

Bricks and pallets for walls and partitions

LengthHeightWaste %
1,320bricks8×2.5m wall

Paint calculator

Litres and tin count for walls and ceilings

Room sizeCoatsCoverage
9litres5×4m, 2 coats

Flooring calculator

Sq ft, boxes and waste for LVP, wood, tile or carpet

Room sizeLayoutWaste %
11boxes200 sqft, 7% waste

Drywall calculator

Sheets, compound, tape and screws for walls and ceilings

Room sizeSheet sizeDoorsWaste %
18sheets12×10×9 ft

Stair calculator

Risers, treads and stringer length for any floor height

RiseRunStringerIRC check
15risers9 ft ceiling

Rebar calculator

Steel bar weight by diameter and length

DiameterLengthCount
74.4kg13mm × 6m × 20

Excavation calculator

Pit, trench and sloped-side cut volume

LengthWidthDepthWaste %
22.5m³5×3×1.5m

Fence calculator

Posts, rails, concrete and pickets for any fence

LengthHeightSpacingGates
14posts100ft @ 8ft spacing

Mortar calculator

Cement bags, sand and water for brickwork

LengthHeightMix ratioWaste %
8bags5×2m, 1:5 mix

Mulch calculator

Cubic yards and bags for garden beds and borders

Bed shapeAreaDepthWaste %
1.85yd³200 sqft, 3in

Roof pitch calculator

Degrees, ratio & rafter length

Pitch ratioAngleRunRafter length
26.57°6:12 pitch, 24ft span

Unit converter

Length, area, volume and weight conversions

m ↔ ftm² ↔ ft²m³ ↔ yd³평
3.281ft1 m =