Free construction calculators
for trade businesses.
Built for trade businesses. Job margins, markup, labour, concrete, paint, tiling, retention and more.
Business & Margin Calculators
Job Margin Calculator
Enter revenue and total costs to instantly calculate your gross profit margin on any job.
Markup Calculator
Calculate sell price from cost + markup %, or work backwards from sell price to find your margin.
Hourly Rate Calculator
Work out exactly what you need to charge per hour to cover costs and hit your income target.
Labour Oncost Calculator
Calculate the true cost of hiring — base wage plus super, workers comp, leave loading, payroll tax.
Break-Even Calculator
Find out how much revenue you need each month to cover your fixed and variable costs.
Contingency Calculator
Add the right risk buffer to your bid based on project risk level — low, medium, or high risk.
Trade & Material Calculators
Concrete Volume Calculator
Calculate m³ needed for slabs, footings, columns, and beams — plus number of premix bags.
Paint Coverage Calculator
Enter area, number of coats, and coverage rate to calculate litres or gallons needed.
Tiling Calculator
Calculate tiles, boxes, and adhesive needed for any room including wastage allowance.
Roof Area Calculator
Calculate actual roof area from footprint dimensions and pitch angle — any roof slope.
Excavation Volume Calculator
Calculate cubic metres to excavate or fill, including soil swell factor for cartage.
Retention & Progress Claim
Calculate retention amounts held and released, plus progress claim at any completion %.
Need a full quantity takeoff done?
These calculators help you estimate quickly. But if you need the full count done — standard-compliant BOQ, takeoff sheets, and marked-up drawings — our team is ready to deliver.