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.

Track actual vs estimated costs per job. See your real profit on every job, not just what you quoted.

Plan monthly cash flow as a tradesman. Enter income, expenses and CIS deductions to see your monthly position.

Calculate total annual van costs including finance, fuel, insurance, VED and servicing.

Track construction retention held across live jobs. See cash flow impact and defects period release dates.

Convert your hourly rate to day, week and month rates — or reverse-calculate your hourly from a target day rate.

Compare VAT Flat Rate Scheme vs standard VAT. See your annual saving and find out if FRS is right for your trade.

Calculate the right deposit and stage payments for any job. Choose from common split patterns or customise your own.

Find out exactly how many jobs you need each month to cover costs and hit your take-home target.

Calculate weekly, monthly and annual apprentice wages using the latest UK National Minimum Wage rates for 2025/26.

Calculate CIS deductions for subcontractors at 0%, 20% or 30%. Split labour vs materials and generate a monthly payment summary.

Calculate bricks or blocks needed for any wall area. Includes mortar bags, wastage and UK 2026 material costs by bond type.

Estimate bathroom renovation costs by size and spec — from a basic refresh to a full wet room conversion. UK 2026 pricing.

Estimate kitchen renovation costs by size, unit quality and finish. Covers supply, fit, worktops and appliances. UK 2026.

Estimate single or double-storey extension costs by m². Includes foundations, structure, insulation and finishing. UK 2026.

Estimate Velux, dormer or hip-to-gable loft conversion costs. Includes structural, insulation and finishing. UK 2026.

Estimate garden landscaping costs by size and features — patio, decking, planting, fencing and drainage. UK 2026.

Estimate your public liability, tools and employer's liability insurance costs as a UK tradesperson.

Estimate insurance premiums for handymen and multi-trade sole traders — public liability, tools and income protection.

Calculate total electrical load (kW and kWh) for a UK home. Size consumer units and check circuit capacity.

Estimate cleaning costs by property size and service type — standard, deep clean, or end of tenancy.

Estimate mowing, scarification and garden maintenance costs by lawn size and service.

Estimate full re-roofing costs by property type, material and location. Includes scaffolding and disposal.

Fill in a professional work order online and print or save as PDF. Free, no signup, no watermark.

Create a professional receipt in seconds. Fill in job details, add line items, print or save as PDF.

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.

Estimate driveway installation costs by size, material and location — block paving, tarmac, resin bound, gravel and concrete.

Estimate boiler replacement costs for combi, system, oil and heat pump options — with BUS grant deductions.

Calculate the right boiler output (kW) for your home using CIBSE/SAP heat loss estimates. Get combi, system or regular boiler recommendations.

Size copper pipes for domestic hot and cold water using BS EN 806 / CIBSE Guide G. Calculates flow, velocity and equivalent lengths for 15–42mm.

Estimate home EV charger installation costs including cable runs, consumer unit upgrades and LEVI grant deductions.

Calculate flooring installation costs per m² for LVT, engineered hardwood, carpet, laminate, solid wood and tiles.

Calculate your solar panel payback period, annual savings and Smart Export Guarantee earnings. UK 2026 energy prices.

Calculate voltage drop to BS 7671 mV/A·m method. PASS/WARNING/FAIL status with max run calculation for 5% limit.

Select the minimum cable size meeting both current rating and volt drop limits to BS 7671 Tables 4D2A and 4Ab.

Four-way V/I/R/P solver — enter any two values to calculate the remaining two using Ohm's Law and Watt's Law.

Convert between kW, kVA and amps for single and three-phase circuits with adjustable power factor.

Check cable fill against the 45% BS 7671 limit for steel and plastic conduit from 16–63mm diameter.

Calculate maximum demand with BS 7671 diversity factors. Dynamic circuit table with ADMD, kW totals and 100A threshold flag.

Calculate Zs = Ze + 1.2×(R1+R2) and check against BS 7671 Table 41.3 maximum Zs values. PASS/FAIL per circuit type.

Calculate PFC in kA from supply impedance. Flags whether 6 kA or 10 kA rated protective devices are required.

Size the CPC using BS 7671 Table 54.7 simplified method or the adiabatic equation S = √(I²t)/k.

Apply BS 7671 derating factors (ambient temp, grouping, insulation, clipped direct) to find required cable Iz.