Online calculators.
Quick estimates for tax, payroll, mortgages and more. Illustrative only — not a substitute for professional advice.
Stamp Duty (SDLT) calculator
Stamp Duty Land Tax on residential property purchases — including first-time buyer relief and the additional-property surcharge.
OpenProperty tax (SDLT/LBTT/LTT) calculator
Stamp Duty, LBTT and LTT on property purchases in England, Northern Ireland, Scotland and Wales.
OpenIncome tax & take-home
Estimate income tax and National Insurance on a gross salary — England, Wales and Northern Ireland.
OpenMortgage calculator
Monthly payment, total interest, and total repayable on a repayment mortgage.
OpenVAT calculator
Calculate the VAT element of a price — add VAT to a net amount or extract VAT from a gross amount.
OpenPayslip calculator
Estimate take-home pay from a gross salary — includes income tax and Class 1 NI for 2026/27.
OpenCIS tax deduction calculator
Work out the CIS deduction a contractor must withhold when paying a sub-contractor.
OpenCompany car & fuel benefit-in-kind
Estimate the benefit-in-kind tax on a company car (and fuel benefit) using current CO₂-based rates.
OpenFuel costs calculator
Estimate annual fuel costs from your mileage, fuel price and miles-per-gallon.
OpenAPR calculator
Estimate the effective Annual Percentage Rate on a loan with fixed monthly repayments.
OpenLoan calculator
Work out the monthly repayment, total interest and total repayable on a fixed-rate loan.
OpenSavings calculator
Project the future value of regular savings, accounting for interest and inflation.
OpenMillionaire calculator
How long will it take you to become a millionaire? Or, how much do you need to save each month to hit a target by a certain date?
OpenGross profit calculator
Calculate gross profit, gross margin and mark-up from sales and cost of sales.
OpenMore profit calculator
Model the impact of changes to sales, costs and overheads on your bottom line.
OpenStartup costs calculator
Build a one-page picture of how much funding you need to launch a new business.
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