From mortgages to stamp duty, income tax to BMI — accurate, jargon-free calculators designed specifically for people in the United Kingdom.
Mortgages, savings, loans, compound interest and ISAs
18 calculators →Income tax, NI, VAT, capital gains, dividend and self-assessment
12 calculators →Stamp duty, rental yield, BTL mortgage and HMO returns
10 calculators →BMI, BMR, calorie needs, ideal weight and body fat
8 calculators →Percentages, fractions, ratios and scientific functions
12 calculators →Date calculator, age, tip, fuel cost, unit converter
10 calculators →Profit margin, break-even, payroll, corporation tax
10 calculators →In-depth UK financial guides, how-tos and explainers
Read our guides →Monthly repayments & total cost
2024/25 take-home pay
SDLT for England & N. Ireland
Watch your savings grow
Add or remove VAT instantly
Tax-free savings growth
Body Mass Index & healthy weight
Gross & net property returns
CGT on property & investments
Days since & days until
Monthly payments & total interest
Three types of percentage sum
We built this site with one simple goal: to give UK users the most accurate, straightforward, and genuinely useful free calculators available online. Unlike many calculator sites that use US-centric figures, dollar amounts, or outdated tax rates, every tool on this site is built specifically for people living and working in the United Kingdom.
All monetary values are displayed in pounds sterling (£). Our tax calculators use the most current HMRC rates for the 2024/25 tax year, including the latest income tax thresholds, National Insurance changes, stamp duty land tax (SDLT) rates, ISA allowances, and CGT annual exemption figures.
Mortgage Calculator: Enter your property price, deposit, interest rate, and term to get your monthly repayment, total amount repayable, and total interest cost. Works for both repayment and interest-only mortgages.
Income Tax Calculator: Enter your gross salary to see your take-home pay after income tax and National Insurance, broken down by month and week. Uses 2024/25 HMRC rates including the frozen personal allowance of £12,570.
Stamp Duty Calculator: Calculate SDLT for standard buyers, first-time buyers (with relief up to £625,000), and buyers of additional properties with the 3% surcharge applied.
Date Calculator: Find out exactly how many days since or until any date. Includes live countdowns to Christmas, the Olympics, the FIFA World Cup, and 50+ famous historical events — updated daily.
All calculators on TheCalculatorSite.co.uk are provided for guidance and educational purposes only. They do not constitute financial, tax, legal, or investment advice. Figures are estimates based on the information you provide and the rates in effect at time of writing. Always consult a qualified professional — such as an independent financial adviser, solicitor, or chartered accountant — before making significant financial decisions.