Free
209+ calculators
No sign-up, no paywall, just the calculator and the result.
Regional
GBP ready
Figures, tax bands, and terminology tuned for United Kingdom.
Practical
Built for decisions
Start broad, compare scenarios, then move into a specific calculator.
Most used
Popular calculators
A fast route into the tools people land on first.
Mortgage Calculator
Calculate your monthly mortgage payments instantly. Enter loan amount, interest rate and term.
Salary After Tax Calculator
Calculate your take-home pay after income tax and national insurance or social security.
Stamp Duty Calculator
Calculate UK Stamp Duty Land Tax on residential and buy-to-let purchases. Enter the purchase price to see the exact SDLT due under current UK government rates.
Income Tax Calculator
Calculate income tax across all bands. Enter your personal allowance for your country.
Compound Interest Calculator
Calculate how compound interest grows savings or increases debt over time. Enter principal, rate, compounding frequency and term to project your final balance.
Loan Calculator
Calculate monthly loan repayments, total interest and overall cost. Enter the loan amount, interest rate and term to plan your borrowing.
VAT Calculator
Calculate VAT at the standard, reduced or zero UK rate. Add VAT to a net price or remove VAT from a gross price to find the correct tax amount quickly.
BMI Calculator
Calculate your Body Mass Index using height and weight to assess whether you are underweight, healthy, overweight or obese using standard BMI classifications.
Browse by topic
Category hubs
When you want the full set, open a topic hub and compare related tools side by side.
Property
Property calculators
Compare 10 related tools in one place, then jump straight to the calculator that fits.
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Tax
Tax calculators
Compare 10 related tools in one place, then jump straight to the calculator that fits.
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Salary
Salary calculators
Compare 7 related tools in one place, then jump straight to the calculator that fits.
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Investing
Investing calculators
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Everyday
Everyday calculators
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Property focus
Buying, borrowing, or remortgaging?
Start with the property calculators guide, then move into the rent vs buy page if you want a cleaner decision between monthly ownership costs and staying flexible.
More calculators
Extra tools that match real decisions
These are grouped by the job the calculator actually does, so the hub feels like a route map rather than a list of random links.
Mortgage and property
Mortgage and property
The tools people need when they are comparing a purchase, checking borrowing power, or testing the cost of changing a mortgage.
Mortgage Calculator
Estimate monthly repayments and total interest before you commit.
Mortgage Affordability Calculator
Check the income and outgoings view before making offers.
Stamp Duty Calculator
Run the SDLT bill against a purchase price before you commit.
Deposit Savings Calculator
Map the route from today's balance to the target deposit.
Loan-to-Value Calculator
See how deposit size changes the borrowing ratio.
Mortgage Overpayment Calculator
Compare interest saved against keeping cash flexible.
Rent vs Buy Calculator
Compare rent, ownership costs, and the long-term trade-off.
Refinancing Calculator
Test whether a new rate and term are worth the switch.
Tax and pay
Tax and pay
Useful when the real question is what a salary, bonus, or tax band change becomes after PAYE and NI have taken their share.
Salary After Tax Calculator
Turn a gross salary into take-home pay.
Income Tax Calculator
See which band your income lands in.
National Insurance Calculator
Separate NI from tax when the pay packet looks wrong.
Salary Sacrifice Calculator
Compare payroll sacrifice against standard pay.
Dividend Tax Calculator
Check the personal-side result after company profit is paid out.
Corporation Tax Calculator
Test marginal relief and the company bill.
Savings and investing
Savings and investing
A better fit when the decision is about cash buffers, ISA wrappers, compounding, or long-term retirement saving.
Savings Calculator
Work backwards from the amount you want to build.
Savings Growth Calculator
See what regular contributions add up to.
Compound Interest Calculator
Show how returns build over time.
Retirement Savings Calculator
Model the long-run pension or ISA path.
ISA Calculator
Check how much can stay sheltered from tax.
Pension Contribution Calculator
Compare tax relief today with future savings.
Business and self-employed
Business and self-employed
For people who need to turn invoices, VAT, payroll, and self-employment income into something they can plan around.
Self-Employed Tax Calculator
Estimate tax and NI before the bill arrives.
VAT Calculator
Quickly separate net and gross prices.
Profit Margin Calculator
Check the margin on a product or service.
Break-Even Calculator
Find the sales level where the business stops losing money.
Invoice Totals Calculator
Build totals including tax and extras.
Hourly Rate Calculator
Turn a target income into a billable rate.
Useful next steps
Tools and services
A short, editorially chosen set of tools and books that support the same decisions as the calculators.
Morgan Housel
The Psychology of Money
Paperback about GBP 9
A concise, high-signal book on why behaviour matters more than spreadsheets when people make money decisions.
View on AmazonPartnerTim Hale
Smarter Investing
Paperback about GBP 15
A practical UK investing reference that pairs well with savings, ISA, pension and compound growth calculators.
View on AmazonPartnerTaxcafe
Running a Limited Company
Paperback about GBP 25
Useful for directors who are using profit, VAT, and tax calculators to plan the next 12 months.
View on AmazonWe may earn a commission if you use these links. This does not affect our editorial independence.
Read next
Deeper guides and comparisons
These pages add the practical context behind the calculators: when to overpay, when to keep cash, and how to turn a salary or savings decision into a plan.
Editorial
Mortgage overpayments
When clearing debt faster beats keeping cash liquid.
Editorial
Emergency fund guide
How much cash to keep and where to keep it.
Editorial
Pay rise and tax
What a gross salary increase becomes after deductions.
Editorial
UK tax code guide
Understand 1257L, K codes and emergency codes.
Editorial
Best emergency fund calculators
Compare the calculators that help you build a buffer.
Editorial
Best tax planning calculators
Compare salary, NI, pension and sacrifice tools.
Editorial
Overpay vs savings
Balance interest savings against flexibility and resilience.
Editorial
Salary sacrifice vs bonus
Compare cash now with tax-efficient long-term planning.
Official references
UK sources behind the numbers
These pages and official sources support the calculators above and give readers a clean route into the underlying rules.
Internal
UK tax code guide
Understand 1257L, K codes, emergency codes, and PAYE checks.
Internal
Emergency fund guide
Where cash should live before you decide to lock it into a mortgage.
External
GOV.UK tax codes overview
Official PAYE tax-code guidance from HMRC and GOV.UK.
External
Tax on savings interest
How savings interest is taxed and where allowances apply.
External
ISAs overview
The official rules for tax-free cash savings and ISA wrappers.
External
FSCS protection
Deposit protection limits for cash you keep in savings accounts.
Ready when you are
Start with the calculator that matches the decision.
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