Built for Australian contractors
Construction calculatorsfor Australian contractors.
Quickly calculate payment schedules, progress claims, retention, GST, labour and material costs. No signup, no upsells — just the tools you need on site or at your desk.
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Live previewPayment Schedule
Open full calculator Total contract
$450,000
Total retention
$22,500
Net payable
$450,000
Payments
7
Schedule preview7 rows
Mobilisation
05 May 2026
10%
$42,750
Progress Payment 1
10 June 2026
20%
$85,500
Progress Payment 2
17 July 2026
20%
$85,500
Progress Payment 3
23 Aug 2026
20%
$85,500
Progress Payment 4
29 Sept 2026
20%
$85,500
+ 2 more rows…
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Calculators grouped by job — pick a category to narrow down.
4 tools
Payments & Claims
Schedules, progress claims, retention, late interest.
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2 tools
Quoting & Estimating
Markup, contingency, profit, quote builders.
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2 tools
Labour & Materials
Crew costs, on-costs, materials with waste.
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1 tools
Tax & GST
GST inclusive/exclusive, retention on tax invoices.
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1 tools
Variations & Extras
Variations, extras, scope changes priced cleanly.
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8 tools
Templates & Documents
Schedules, claims, invoices, releases — ready to use.
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#1 Popular 3 min
Construction Payment Schedule Calculator
Build a milestone payment schedule with retention and GST.
Best for: Builders & head contractorsOpen
#2 Popular 2 min
Progress Claim Calculator
Work out the next claim from work completed and prior payments.
Best for: SubcontractorsOpen
#3 Popular 2 min
Retention Calculator
Track retention held, practical completion, and final release.
Best for: Builders & subbiesOpen
#4 Popular 2 min
Contractor Quote Markup Calculator
Add overhead, profit and contingency to a base cost.
Best for: EstimatorsOpen
#5 Popular 2 min
Labour Cost Calculator
Total labour cost across crew, hours, super and travel.
Best for: Site managersOpen
#6 Popular 2 min
Material Cost Calculator
Material total with waste, delivery, and GST.
Best for: EstimatorsOpen
#7 Popular 1 min
GST Invoice Calculator
Add or extract GST and apply retention to an invoice.
Best for: All contractorsOpen
#8 Popular 2 min
Variation Cost Calculator
Cost up a variation with overhead, profit and GST.
Best for: BuildersOpen
#9 Popular 1 min
Late Payment Interest Calculator
Calculate interest on overdue construction payments.
Best for: SubcontractorsOpen
#10 Popular 3 min
Construction Invoice Generator
Generate a tidy GST invoice with retention support.
Best for: Tradies & subbiesOpen
General information only. These calculators are general tools and do not replace legal, accounting, or contract advice. Always confirm requirements for your state, contract type, and project.