Built for UK subcontractors
Free QS tools
Choose a tool to check dates, values, costs or quantities.
Payment & notices
Check a timetable, a notice or an application.
Payment date calculator
Calculate the payment and notice dates using your contract periods.
Open this toolPayment notice checker
Check when payment and pay-less notices were due and issued.
Open this toolNotice deadline & draft
Calculate a notice deadline and prepare a structured first draft.
Open this toolLate payment interest
Estimate interest and any applicable compensation on an overdue sum.
Open this toolPayment application calculator
Build a cumulative application from work, changes and previous payments.
Open this toolPlanning & quantities
Plan materials, changes and forecast receipts.
Material quantities by trade
Choose a trade, then calculate quantities using your own assumptions.
Open this toolVariation pricing calculator
Build up labour, materials, plant and allowances for a change.
Open this toolCash flow forecast
Compare your planned valuations and receipts over the contract.
Open this toolCosts & pricing
Build up costs or check an hourly rate.
Daywork cost calculator
Total the labour, material and plant used for a daywork record.
Open this toolSite preliminaries calculator
Estimate time-related site costs over the delay period.
Open this toolLabour charge-out rate
Turn employment costs and productive hours into an hourly selling rate.
Open this toolUsing these tools on a live job
Free QS tools for subcontractors
Free QS tools for subcontractors help you check a commercial calculation before you issue a document or make a project decision. The calculators cover payment dates, notices, applications, variations, labour, preliminaries, cash flow and material quantities. Each tool explains the inputs, shows the calculation and gives you a result that you can save with the job records.
If the calculation needs a wider review of the job, explore QSEC support for subcontractor project teams.
First, choose the calculator that matches the question you need to answer. Next, enter the dates, values or quantities from the signed subcontract and current project records. Then, review every assumption shown beside the result. Finally, keep a PDF or screenshot with the relevant application, notice, quotation or cost record. This simple sequence makes later checks much easier.
Use the result with the signed subcontract
The tools provide practical quantity surveying support, not legal advice or a guaranteed outcome. Contract amendments, project facts and notices already issued can change the correct answer. Therefore, you should compare every result with the signed terms and the latest correspondence before relying on it. If an input is uncertain, record the assumption instead of treating the result as final.
For live payment work, read our payment application support. For changes and compensation events, see our variation support. You can also download structured working sheets from the free QS template library.
Need help with the wider picture?
Use the tools to organise your next step. If the contract, evidence or risk needs a fuller review, explore QS support or ask the team.