Construction Calculators
Ten free, AU-tuned calculators for builders, subcontractors and tradies. Work out payment schedules, progress claims, retention, GST, labour and material costs in minutes — no signup, no upsells. Each calculator pairs with a downloadable template and a plain-English guide.
- #1 PopularPayments3 min
Construction Payment Schedule Calculator
Build a milestone payment schedule with retention and GST.
Best for: Builders & head contractorsOpen calculator - #2 PopularClaims2 min
Progress Claim Calculator
Work out the next claim from work completed and prior payments.
Best for: SubcontractorsOpen calculator - #3 PopularPayments2 min
Retention Calculator
Track retention held, practical completion, and final release.
Best for: Builders & subbiesOpen calculator - #4 PopularEstimating2 min
Contractor Quote Markup Calculator
Add overhead, profit and contingency to a base cost.
Best for: EstimatorsOpen calculator - #5 PopularLabour2 min
Labour Cost Calculator
Total labour cost across crew, hours, super and travel.
Best for: Site managersOpen calculator - #6 PopularMaterials2 min
Material Cost Calculator
Material total with waste, delivery, and GST.
Best for: EstimatorsOpen calculator - #7 PopularTax & GST1 min
GST Invoice Calculator
Add or extract GST and apply retention to an invoice.
Best for: All contractorsOpen calculator - #8 PopularVariations2 min
Variation Cost Calculator
Cost up a variation with overhead, profit and GST.
Best for: BuildersOpen calculator - #9 PopularPayments1 min
Late Payment Interest Calculator
Calculate interest on overdue construction payments.
Best for: SubcontractorsOpen calculator - #10 PopularInvoices3 min
Construction Invoice Generator
Generate a tidy GST invoice with retention support.
Best for: Tradies & subbiesOpen calculator