Free Trade Tools & Calculators

Work out exactly what to charge per hour to cover costs, pay yourself fairly and hit your profit targets.

Calculate your gross and net margin on any job to make sure every quote is actually profitable.

Estimate total labour costs for a job based on team size, hours and hourly rates.

Add the right markup to materials so you're never losing money on supplies again.

Estimate your UK income tax and National Insurance for the 2024/25 tax year as a self-employed tradesman.

Find out how much CIS tax you've overpaid and estimate your HMRC refund as a subcontractor.

Log business miles and expenses using HMRC-approved rates. See your tax saving in real time.

Create and download professional invoices instantly — no account needed.

Calculate overhead and profit (O&P) on direct costs — separate percentages for cost-plus contracts and insurance work.

Get a ballpark estimate for roofing work based on roof size, pitch and material type.

Calculate how many litres of paint you need for any room or surface area.

Estimate the right heating or cooling capacity (BTU/kW) for any room or building.

Calculate total electrical load for a property to size circuits and consumer units correctly.

Estimate plastering costs per m² for skim, full re-plaster, artex removal, and render — with UK 2026 pricing.