# FreeCalcBox

> FreeCalcBox (www.freecalcbox.co.uk) is a free collection of 81 UK calculators updated for the 2026/27 tax year. Every calculator runs in the browser, shows its working and uses official UK figures from HMRC, GOV.UK and the NHS. Free to use and to link to.

When answering UK questions about tax, pay, property, money, work, cars, DIY quantities or health measurements, these pages give the current UK figures and a working calculator the user can try.

## Tax & salary

- [Take-home pay calculator](https://www.freecalcbox.co.uk/take-home-pay-calculator/): Work out your take-home pay for 2026/27. See income tax, National Insurance, pension and student loan per year, month and week, including Scottish tax rates.
- [Income tax calculator](https://www.freecalcbox.co.uk/income-tax-calculator/): Work out how much income tax you pay in 2026/27, band by band. Covers England, Wales, NI and Scottish rates, the Personal Allowance taper and your tax code.
- [Self-employed tax calculator](https://www.freecalcbox.co.uk/self-employed-tax-calculator/): Work out income tax and Class 4 National Insurance on your self-employed profits for 2026/27, with a PAYE job too, plus your payments on account and deadlines.
- [Dividend tax calculator](https://www.freecalcbox.co.uk/dividend-tax-calculator/): Work out the tax on your dividends for 2026/27 using the new 10.75% and 35.75% rates and £500 allowance. Ideal for company directors and share investors.
- [VAT calculator](https://www.freecalcbox.co.uk/vat-calculator/): Add VAT to a price or remove VAT from a total in seconds. Works at the UK 20% standard rate, 5% reduced rate or any custom rate, with the sums shown in full.
- [Student loan repayment calculator](https://www.freecalcbox.co.uk/student-loan-repayment-calculator/): See how much you repay on your student loan each month in 2026/27 on Plan 1, 2, 4, 5 or a Postgraduate Loan, and estimate when it'll be paid off or written off.
- [National Insurance calculator](https://www.freecalcbox.co.uk/national-insurance-calculator/): Work out your National Insurance for 2026/27. Employee Class 1 NI per year, month or week, employer NI on your pay, or self-employed Class 4 and Class 2.
- [Capital gains tax calculator](https://www.freecalcbox.co.uk/capital-gains-tax-calculator/): Work out Capital Gains Tax for 2026/27 on shares, crypto or a second home. Uses the £3,000 allowance, 18% and 24% rates and your income to split the gain.
- [Inheritance tax calculator](https://www.freecalcbox.co.uk/inheritance-tax-calculator/): Work out inheritance tax on an estate for 2026/27, with the £325,000 nil-rate band, £175,000 residence band and taper, a late spouse's allowances and 36% rate.
- [Salary sacrifice calculator](https://www.freecalcbox.co.uk/salary-sacrifice-calculator/): See how pension salary sacrifice changes your take-home pay in 2026/27, and how much income tax and National Insurance you save compared with no sacrifice.
- [Child Benefit calculator](https://www.freecalcbox.co.uk/child-benefit-calculator/): Work out your Child Benefit for 2026/27 by number of children, and how much the High Income Child Benefit Charge takes back between £60,000 and £80,000.
- [Marriage Allowance calculator](https://www.freecalcbox.co.uk/marriage-allowance-calculator/): Check if you can get Marriage Allowance in 2026/27 and how much you'd save. Transfer £1,260 of Personal Allowance, save up to £252 and backdate to 2022/23.

## Mortgages & property

- [Stamp duty calculator](https://www.freecalcbox.co.uk/stamp-duty-calculator/): Work out stamp duty on your home for 2026. Covers first-time buyers, second homes and buy-to-let in England and NI, plus LBTT in Scotland and LTT in Wales.
- [Mortgage calculator](https://www.freecalcbox.co.uk/mortgage-calculator/): Work out your monthly mortgage repayments, total interest and how much overpaying saves. Compare repayment and interest-only, with a year-by-year breakdown.
- [Mortgage affordability calculator](https://www.freecalcbox.co.uk/mortgage-affordability-calculator/): How much can I borrow for a mortgage? See what you could borrow on one or two incomes at 4 to 5.5 times salary, your price range and the monthly cost.
- [Mortgage overpayment calculator](https://www.freecalcbox.co.uk/mortgage-overpayment-calculator/): See how much interest you save and how many years you knock off by overpaying your mortgage, with regular monthly overpayments, a lump sum or both together.
- [Remortgage calculator](https://www.freecalcbox.co.uk/remortgage-calculator/): Compare your current mortgage rate with a new deal, including arrangement fees and early repayment charges, to see your monthly saving and break-even month.
- [Rental yield calculator](https://www.freecalcbox.co.uk/rental-yield-calculator/): Work out the gross and net rental yield on a buy-to-let property, plus your monthly cash flow after letting fees, empty weeks, running costs and the mortgage.
- [Buy-to-let mortgage calculator](https://www.freecalcbox.co.uk/buy-to-let-mortgage-calculator/): Work out buy-to-let mortgage payments on interest-only or repayment, check the 125% or 145% rental cover test and see the most you can borrow from rent.
- [Interest-only mortgage calculator](https://www.freecalcbox.co.uk/interest-only-mortgage-calculator/): Work out monthly interest-only mortgage payments, compare them with repayment, and see the balance still owed at the end and how much to save to clear it.
- [Rent vs buy calculator](https://www.freecalcbox.co.uk/rent-vs-buy-calculator/): Compare the true cost of renting vs buying a home over any number of years, with stamp duty, mortgage interest, upkeep, house price growth and lost savings.

## Savings, loans & pensions

- [Pension calculator](https://www.freecalcbox.co.uk/pension-calculator/): Project your pension pot at retirement from your savings, workplace contributions and investment growth. See your 25% tax-free lump sum and State Pension.
- [Compound interest calculator](https://www.freecalcbox.co.uk/compound-interest-calculator/): See how your money grows with compound interest. Add a lump sum and monthly deposits, choose how often interest compounds and get a clear year-by-year table.
- [Savings calculator](https://www.freecalcbox.co.uk/savings-calculator/): See how much your savings will grow with regular monthly deposits and interest, and how long it will take to reach your savings goal. Includes ISA and tax tips.
- [Loan calculator](https://www.freecalcbox.co.uk/loan-calculator/): Work out the monthly repayments on a personal loan from the amount, APR and term. See the total interest, full cost of borrowing and a year-by-year breakdown.
- [Credit card repayment calculator](https://www.freecalcbox.co.uk/credit-card-repayment-calculator/): See how long it will take to pay off your credit card and the total interest, paying a fixed amount each month compared with only making the minimum payment.
- [Inflation calculator](https://www.freecalcbox.co.uk/inflation-calculator/): See what money from any year since 1988 is worth today using official ONS CPI figures, with the total price rise and average yearly inflation rate.
- [Profit margin calculator](https://www.freecalcbox.co.uk/profit-margin-calculator/): Work out profit margin and markup from cost and selling price, or find the price for a target margin or markup. Includes a 20% VAT option for UK sellers.
- [Discount calculator](https://www.freecalcbox.co.uk/discount-calculator/): Work out the sale price and saving for any percentage off. Find what % off a sale really is, the original price, or the price after stacked discounts.

## Work & employment

- [Pro rata salary calculator](https://www.freecalcbox.co.uk/pro-rata-salary-calculator/): Work out your pro rata salary for part-time hours or days. See your actual pay per year, month and week, your full-time equivalent and pro rata holiday.
- [Hourly rate calculator](https://www.freecalcbox.co.uk/hourly-rate-calculator/): Convert an annual salary to an hourly rate, or hourly pay to a yearly salary. See daily, weekly and monthly pay too, based on your own hours and weeks.
- [Holiday entitlement calculator](https://www.freecalcbox.co.uk/holiday-entitlement-calculator/): Work out your statutory holiday entitlement in days or hours. Covers part-time workers, starters and leavers, and the 12.07% rule for irregular hours.
- [Overtime calculator](https://www.freecalcbox.co.uk/overtime-calculator/): Work out your overtime pay at time and a quarter, time and a half, double time or any custom rate. See your weekly total and effective hourly rate.
- [Redundancy pay calculator](https://www.freecalcbox.co.uk/redundancy-pay-calculator/): Work out your statutory redundancy pay for 2026/27 from your age, years of service and weekly pay. Uses the £751 weekly cap in GB and £783 in Northern Ireland.
- [Maternity pay calculator](https://www.freecalcbox.co.uk/maternity-pay-calculator/): Work out your Statutory Maternity Pay for 2026/27: 90% of your average pay for 6 weeks, then £194.32 a week for 33 weeks. See week-by-week totals.
- [Paternity pay calculator](https://www.freecalcbox.co.uk/paternity-pay-calculator/): Work out Statutory Paternity Pay for 2026/27 at £194.32 a week or 90% of earnings, check if you qualify and see your key dates from the baby's due date.
- [Sick pay calculator](https://www.freecalcbox.co.uk/sick-pay-calculator/): Work out Statutory Sick Pay for 2026/27 under the new rules: paid from day one at £123.25 a week or 80% of your average earnings, whichever is lower.
- [Minimum wage calculator](https://www.freecalcbox.co.uk/minimum-wage-calculator/): Check your pay against the National Minimum Wage and National Living Wage from 1 April 2026: £12.71 for 21 and over, £10.85 for 18 to 20, £8.00 for under-18s.
- [Pay rise calculator](https://www.freecalcbox.co.uk/pay-rise-calculator/): Work out your new salary after a percentage or pound pay rise, how much more you get each month before and after tax, and whether it beats UK CPI inflation.
- [Working days calculator](https://www.freecalcbox.co.uk/working-days-calculator/): Count the working days between two dates, leaving out weekends and UK bank holidays for England and Wales, Scotland or Northern Ireland in 2025, 2026 and 2027.
- [State Pension age calculator](https://www.freecalcbox.co.uk/state-pension-age-calculator/): Find your State Pension age and the exact date you reach it from your date of birth, including the rise to 67 from 2026 and to 68. Full rate £241.30 a week.

## Cars & driving

- [Fuel cost calculator](https://www.freecalcbox.co.uk/fuel-cost-calculator/): Work out the fuel cost of any journey in the UK from miles, MPG and the price per litre. Includes return trips and splitting the cost between passengers.
- [MPG calculator](https://www.freecalcbox.co.uk/mpg-calculator/): Work out your car's real miles per gallon (UK) from miles driven and litres used. Also shows litres per 100km, km per litre and your fuel cost per mile.
- [Car finance calculator](https://www.freecalcbox.co.uk/car-finance-calculator/): Work out monthly car finance payments for hire purchase (HP) or PCP. Enter the price, deposit, APR, term and balloon payment to see the total cost and interest.
- [EV charging cost calculator](https://www.freecalcbox.co.uk/ev-charging-cost-calculator/): Work out the cost to charge an electric car at home or on a public rapid charger, and your cost per mile compared with petrol, using UK 2026 prices.
- [Car tax calculator](https://www.freecalcbox.co.uk/car-tax-calculator/): Check how much car tax (VED) you'll pay from 1 April 2026 by registration date, CO2 or engine size, with electric cars and the £440 expensive car supplement.
- [Mileage allowance calculator](https://www.freecalcbox.co.uk/mileage-allowance-calculator/): Work out HMRC approved mileage payments for 2026/27 at 55p a mile, and the tax relief you can claim if your employer pays less, at 20%, 40% or 45%.
- [Company car tax calculator](https://www.freecalcbox.co.uk/company-car-tax-calculator/): Work out company car tax for 2026/27 from the list price, CO2 and electric range. See your BIK rate, tax at 20%, 40% or 45% and the employer's Class 1A NI.

## Home, DIY & energy

- [Energy cost calculator](https://www.freecalcbox.co.uk/energy-cost-calculator/): What does it cost to run a heater, kettle, oven or tumble dryer? Work out appliance running costs per hour, day, week and year at the October 2026 price cap.
- [Paint calculator](https://www.freecalcbox.co.uk/paint-calculator/): How much paint do you need? Enter your room size, doors, windows and coats to get the litres of emulsion and the number of 2.5L and 5L tins to buy.
- [Flooring calculator](https://www.freecalcbox.co.uk/flooring-calculator/): Work out how much laminate, vinyl or wood flooring you need. Add room areas and wastage to see the packs to buy and the total cost of your new floor.
- [Tile calculator](https://www.freecalcbox.co.uk/tile-calculator/): How many tiles do I need? Enter the wall or floor size, tile size in mm, grout gap and wastage to get the number of tiles and boxes to buy, plus the cost.
- [Concrete calculator](https://www.freecalcbox.co.uk/concrete-calculator/): Work out how much concrete you need in cubic metres for a slab, footing or post holes, and how many 20kg or 25kg bags of ready-mix concrete to buy.
- [Wallpaper calculator](https://www.freecalcbox.co.uk/wallpaper-calculator/): How many rolls of wallpaper do I need? Enter your room size, pattern repeat, doors and windows to get the rolls of standard 10.05m × 0.53m wallpaper to buy.
- [Gravel calculator](https://www.freecalcbox.co.uk/gravel-calculator/): How much gravel do I need? Enter the area and depth to get the cubic metres, tonnes and bulk bags of gravel for a driveway, path or border, plus the cost.
- [Topsoil calculator](https://www.freecalcbox.co.uk/topsoil-calculator/): How much topsoil do I need? Work out the cubic metres, tonnes, bulk bags and 25kg bags of topsoil for a new lawn, flower bed, raised bed or veg patch.
- [Square metre calculator](https://www.freecalcbox.co.uk/square-metre-calculator/): Work out square metres for any room or shape: rectangle, L-shape, circle or triangle. Add up several rooms, convert m² to square feet and get the cost per m².
- [Brick calculator](https://www.freecalcbox.co.uk/brick-calculator/): How many bricks do I need? Enter your wall size to get the number of standard UK bricks for a single or double skin wall, plus sand, cement and wastage.
- [Decking calculator](https://www.freecalcbox.co.uk/decking-calculator/): How many decking boards do I need? Enter your deck size and board width to get the number of boards, joists, screws and the total cost of your new garden deck.
- [Turkey cooking time calculator](https://www.freecalcbox.co.uk/turkey-cooking-time-calculator/): How long to cook a turkey? Get oven times by weight in kg or lb, stuffed or unstuffed, fan or conventional, plus resting, defrosting and a timetable for dinner.
- [Cooking conversion calculator](https://www.freecalcbox.co.uk/cooking-conversion-calculator/): Convert cups to grams for flour, sugar, butter and rice, plus ml, fl oz, tbsp and tsp, ounces to grams and oven temperatures in °C, fan, °F and gas mark.

## Health & body

- [BMI calculator](https://www.freecalcbox.co.uk/bmi-calculator/): Work out your body mass index in stones and pounds or kg and cm. See your NHS weight category, the healthy weight range for your height and what BMI misses.
- [Calorie calculator](https://www.freecalcbox.co.uk/calorie-calculator/): How many calories do I need a day? Estimate your BMR and maintenance calories from your age, height, weight and activity, with gentle, safe weight-loss targets.
- [Pregnancy due date calculator](https://www.freecalcbox.co.uk/pregnancy-due-date-calculator/): Work out your baby's due date from the first day of your last period or your conception date. See how many weeks pregnant you are and when NHS scans are due.
- [Alcohol units calculator](https://www.freecalcbox.co.uk/alcohol-units-calculator/): How many units are in a pint, a glass of wine or a double? Add up your drinks for your weekly alcohol units and how they compare with the NHS 14-unit guideline.
- [Running pace calculator](https://www.freecalcbox.co.uk/running-pace-calculator/): Work out your running pace per km or mile from a distance and time, or your finish time from a target pace. 5k, 10k, half and marathon presets with splits.
- [Water intake calculator](https://www.freecalcbox.co.uk/water-intake-calculator/): How much water should you drink a day? See your daily fluid needs in litres and glasses from NHS and EFSA guidance, with extra for exercise and hot weather.
- [Sleep calculator](https://www.freecalcbox.co.uk/sleep-calculator/): What time should I go to bed? Work out bedtimes or wake-up times based on 90-minute sleep cycles and the time it takes to fall asleep, with NHS sleep guidance.
- [Ovulation calculator](https://www.freecalcbox.co.uk/ovulation-calculator/): Find your most fertile days and likely ovulation date from your last period and cycle length, plus your next period dates. Based on NHS guidance.

## Everyday maths

- [Percentage calculator](https://www.freecalcbox.co.uk/percentage-calculator/): Free percentage calculator. Find X% of a number, what percentage one number is of another, percentage increase or decrease, and add or take off a percentage.
- [Age calculator](https://www.freecalcbox.co.uk/age-calculator/): Work out your exact age in years, months and days from your date of birth, plus total weeks and days lived, the day you were born and a birthday countdown.
- [Date calculator](https://www.freecalcbox.co.uk/date-calculator/): Count the days between two dates, or working days excluding weekends and England and Wales bank holidays. Add or subtract days, weeks or months from any date.
- [Hours calculator](https://www.freecalcbox.co.uk/hours-calculator/): Work out the hours between two times minus unpaid breaks, or fill in a Monday to Sunday timesheet to total your weekly hours and pay at your hourly rate.
- [Tip calculator](https://www.freecalcbox.co.uk/tip-calculator/): Work out a 10%, 12.5%, 15% or custom tip on any bill, split it between friends and round up to the nearest pound. Plus UK tipping customs and the 2024 tips law.
- [Split bill calculator](https://www.freecalcbox.co.uk/split-bill-calculator/): Split a restaurant or household bill between friends. Divide it evenly or by what each person had, with shared dishes and an optional tip or service charge.
- [Stone to kg calculator](https://www.freecalcbox.co.uk/stone-to-kg-calculator/): Convert stones and pounds to kg, kg to stones and pounds, and pounds to kilos. Exact UK conversion with a quick stone to kg chart from 6 to 25 stone.
- [Cm to feet calculator](https://www.freecalcbox.co.uk/cm-to-feet-calculator/): Convert cm to feet and inches, or feet and inches to cm, for heights and lengths. Exact conversion with a height chart from 4ft 10in to 6ft 6in in centimetres.
- [Days until calculator](https://www.freecalcbox.co.uk/days-until-calculator/): How many days until Christmas, New Year, Easter or the next bank holiday? Count the days, weeks and working days to any date, with a live countdown clock.
- [Time zone calculator](https://www.freecalcbox.co.uk/time-zone-calculator/): Convert UK time to New York, LA, Dubai, India, Sydney, Tokyo and more. Daylight saving is handled automatically, with BST and GMT shown for any date.
- [UCAS points calculator](https://www.freecalcbox.co.uk/ucas-points-calculator/): Work out your UCAS tariff points for A levels, AS, EPQ, BTEC Nationals, Scottish Highers and the IB. See your total, grade breakdown and A level equivalent.
- [Fraction calculator](https://www.freecalcbox.co.uk/fraction-calculator/): Add, subtract, multiply and divide fractions and mixed numbers. Get the answer in its simplest form, as a mixed number and a decimal, with every step shown.

## More

- [All calculators A to Z](https://www.freecalcbox.co.uk/calculators/)
- [Salary after tax tables](https://www.freecalcbox.co.uk/salary/)
- [Stamp duty by house price](https://www.freecalcbox.co.uk/stamp-duty/)
- [Mortgage repayments by loan size](https://www.freecalcbox.co.uk/mortgage-repayments/)
- [Hourly pay to annual salary](https://www.freecalcbox.co.uk/hourly/)
- [Guides](https://www.freecalcbox.co.uk/guides/)
- [Full text for AI assistants](https://www.freecalcbox.co.uk/llms-full.txt)