Use calculator
UK calculators and tools
Free calculators to help you check the numbers behind everyday money decisions, from income tax and mortgages to car running costs and household bills.
Each tool uses current UK rates and thresholds, shows its assumptions and works in your browser with no sign-up. Use them to test your own figures before making a decision or reading the full comparison.
Latest tools and calculators
Use calculator
Use calculator
Use calculator
Property
Stamp Duty Calculator for England and Northern Ireland
Estimate residential SDLT, first-time buyer relief and higher rates for additional properties.
Property
LBTT Calculator Scotland
Estimate Scottish LBTT, first-time buyer relief and the Additional Dwelling Supplement.
Property
Land Transaction Tax Calculator Wales
Estimate Welsh LTT for a main home or an additional residential property.
Home & Bills
Appliance Running Cost Calculator
Estimate daily, weekly, monthly and annual electricity cost for an appliance.
Home & Bills
Air Fryer vs Oven Cost Calculator
Compare air fryer and electric oven running costs for the same cooking pattern.
Home & Bills
Electricity Cost Calculator
Estimate household electricity bills from usage, unit rate and standing charge.
Home & Bills
Solar Panel Savings Calculator
Estimate solar bill savings, export income, payback and long-term benefit.
Home & Bills
Heat Pump vs Boiler Calculator
Compare heat pump and gas boiler installation and running costs.
Home & Bills
Broadband Speed Calculator
Estimate a suitable broadband speed for household users and activities.
Use calculator
Use calculator
Money
Capital Gains Tax Calculator
Estimate Capital Gains Tax after allowable costs and the annual exempt amount.
Money
Pension Annual Allowance Calculator
Check pension input against the standard, tapered and carried-forward annual allowance.
Work & Income
UK Income Tax Calculator
Calculate estimated PAYE Income Tax, National Insurance and take-home pay.
Work & Income
Self-Employed Tax Calculator
Estimate Income Tax and Class 4 National Insurance for sole traders and freelancers.
Work & Income
National Insurance Calculator
Estimate employee, employer and self-employed National Insurance contributions.
Work & Income
Hourly Rate Calculator
Convert hourly pay into annual salary and estimated take-home pay.
Work & Income
PAYE Tax Calculator with Student Loan
Estimate PAYE take-home pay including student loan repayments.
Use calculator
Work & Income
Pension Contribution Tax Relief Calculator
Estimate tax relief from pension contributions.
Work & Income
Side Hustle Income Tax Calculator
Estimate tax on additional freelance, trading or side income.
Work & Income
Part-Year Tax Calculator
Estimate tax for mid-year job changes, career breaks or part-year employment.
Work & Income
IR35 Contractor Take-Home Calculator
Compare simplified inside and outside IR35 contractor take-home scenarios.
Work & Income
Share Incentive Plan Calculator
Estimate contribution and matching value in a Share Incentive Plan.
Work & Income
Company Car Tax Calculator
Estimate company car benefit-in-kind tax from list price and BIK percentage.
Work & Income
Employer National Insurance Calculator
Estimate employer National Insurance on employee salary.
Use calculator
Use calculator
Cars
Electric vs Petrol Car Calculator
Estimate fuel, charging and ownership costs for EV and petrol cars.
Use calculator
Use calculator
Cars
PCP vs HP Car Finance Calculator
Compare PCP and HP finance payments, balloon payments and total cost.
Use calculator
Cars
Diesel vs Petrol Car Calculator
Estimate fuel costs and break-even mileage for petrol and diesel cars.
Frequently asked questions
Are the calculators free to use?
Yes. Every calculator on DoCompare is free, needs no sign-up and runs entirely in your browser, so the figures you enter are not stored.
How accurate are the results?
Our calculators use current UK rates and thresholds and are designed to give realistic estimates. They are a guide, not formal financial advice, and each tool explains the assumptions it makes.
Are the figures kept up to date?
We review the rates and assumptions behind each calculator and show a last-updated date on the tool pages so you can see when it was last checked.