Free construction calculators and tools for builders
Work out material, prices and deductions – and turn a material estimate into a quote with one click. All free and no account. Prices and ROT follow the Swedish market (SEK).
Cost & finance calculators
ROT deduction calculator
Work out the ROT deduction and what the customer pays (2026).
VAT calculator
Add VAT or reverse-calculate (25/12/6%).
Hourly rate calculator
What to charge per hour from salary and costs.
Markup & margin
Work out price from cost – markup vs margin.
Employee cost
What an employee really costs, per billable hour.
Late-payment interest
Interest on an unpaid invoice (reference rate + 8%).
Delay penalty
Liquidated damages per AB 04/ABT 06.
Construction calculators
Concrete calculator
Volume, bags, reinforcement and cost for a slab.
Roof calculator
Roof area, tiles, gutters and scaffolding.
Paint coverage
How many litres of paint you need.
Square metres
Work out the area of one or more rooms.
Flooring & tiles
Material and packs for flooring and tiles.
Wallpaper
How many rolls of wallpaper you need.
Studs & timber
Number of studs and linear metres from c/c.
Gravel & crushed stone
Volume in m³ and weight in tonnes.
Plasterboard
Number of boards from wall area and layers.
Insulation
Packs, volume and U-value.
Stairs
Number of steps, rise and going.
Slope & fall
Height difference, percent and 1:X.
Underfloor heating
Loop length and number of loops.
Decking
Linear metres and number of deck boards.
Fence
Number of posts and sections.
Roof trusses
Number of trusses from c/c.
U-value
Thermal resistance and U-value for a construction.
Waste percentage
Material need including waste.