Free Trade Tools & Calculators
Built for tradesmen and their customers. No sign up, no cost โ just instant answers.
For Tradesmen
Pricing, tax and business calculators
Hourly Rate Calculator
Work out exactly what to charge per hour to cover costs, pay yourself fairly and hit your profit targets.
Open toolProfit Margin Calculator
Calculate your gross and net margin on any job to make sure every quote is actually profitable.
Open toolLabour Cost Estimator
Estimate total labour costs for a job based on team size, hours and hourly rates.
Open toolMaterial Markup Calculator
Add the right markup to materials so you're never losing money on supplies again.
Open toolSole Trader Tax Calculator
Estimate your UK income tax and National Insurance for the 2024/25 tax year as a self-employed tradesman.
Open toolCIS Tax Refund Estimator
Find out how much CIS tax you've overpaid and estimate your HMRC refund as a subcontractor.
Open toolMileage & Expense Tracker
Log business miles and expenses using HMRC-approved rates. See your tax saving in real time.
Open toolPDF Invoice Generator
Create and download professional invoices instantly โ no account needed.
Open toolOverhead & Profit Calculator
Calculate overhead and profit (O&P) on direct costs โ separate percentages for cost-plus contracts and insurance work.
Open toolFor Customers
Job estimators to help you plan and budget
Roofing Estimate Calculator
Get a ballpark estimate for roofing work based on roof size, pitch and material type.
Open toolPaint Coverage Calculator
Calculate how many litres of paint you need for any room or surface area.
Open toolHVAC Sizing Estimator
Estimate the right heating or cooling capacity (BTU/kW) for any room or building.
Open toolElectrical Load Calculator
Calculate total electrical load for a property to size circuits and consumer units correctly.
Open toolPlastering Cost Calculator
Estimate plastering costs per mยฒ for skim, full re-plaster, artex removal, and render โ with UK 2026 pricing.
Open toolWant AI to do the maths for you?
Sleepless Tradesman generates accurate quotes, invoices and job plans in seconds โ just describe the job.
Try it free