DoCompare

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.

Browse calculators by topic

Cars

8 live calculators

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Property

6 live calculators

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Home & Bills

7 live calculators

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Home & Living

0 live calculators

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Work & Income

13 live calculators

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Money

4 live calculators

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Latest tools and calculators

Property · Calculator

Mortgage Calculator

Estimate monthly mortgage payments from loan, rate and term.

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Property · Calculator

Rent vs Buy Calculator

Estimate whether renting or buying could cost less over time.

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Money · Calculator

Savings Calculator

Estimate savings growth from deposits and interest.

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Property · Calculator

LBTT Calculator Scotland

Estimate Scottish LBTT, first-time buyer relief and the Additional Dwelling Supplement.

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Home & Bills · Calculator

Electricity Cost Calculator

Estimate household electricity bills from usage, unit rate and standing charge.

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Home & Bills · Calculator

Broadband Speed Calculator

Estimate a suitable broadband speed for household users and activities.

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Home & Bills · Calculator

Broadband Cost Calculator

Compare two broadband deals across the full contract term.

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Money · Calculator

Capital Gains Tax Calculator

Estimate Capital Gains Tax after allowable costs and the annual exempt amount.

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Work & Income · Calculator

UK Income Tax Calculator

Calculate estimated PAYE Income Tax, National Insurance and take-home pay.

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Work & Income · Calculator

Self-Employed Tax Calculator

Estimate Income Tax and Class 4 National Insurance for sole traders and freelancers.

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Work & Income · Calculator

National Insurance Calculator

Estimate employee, employer and self-employed National Insurance contributions.

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Work & Income · Calculator

Hourly Rate Calculator

Convert hourly pay into annual salary and estimated take-home pay.

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Work & Income · Calculator

Dividend Tax Calculator

Estimate tax on dividend income alongside other income.

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Work & Income · Calculator

Part-Year Tax Calculator

Estimate tax for mid-year job changes, career breaks or part-year employment.

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Work & Income · Calculator

Company Car Tax Calculator

Estimate company car benefit-in-kind tax from list price and BIK percentage.

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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.