United Kingdom calculators
Quick, clear answers for money, work, home and everyday life — with the right currency, tax labels, and examples for United Kingdom.
Available calculators
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Age Calculator
Find out your exact age in years, months, days, weeks, and days alive — plus how long until your next birthday.
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BMI Calculator
Work out your body mass index from height and weight — in metric (cm/kg) or imperial (ft+in/lb), with the WHO category band.
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Break-Even Calculator
Find the number of units you need to sell to cover fixed costs — and how many more to hit a target profit.
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Calorie Needs Calculator
Work out your BMR and total daily energy needs from age, sex, height, weight, and activity level — using the Mifflin-St Jeor equation.
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Compound Interest Calculator
See how your savings, ISA, pension, or investment pot could grow over time.
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Days Between Dates Calculator
Count the exact number of days, weeks, months, and years between any two dates.
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Deadline Calculator
Add or subtract any number of days, weeks, months, or years from a start date — and see the resulting deadline.
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Flooring Calculator
Work out the floor area, waste allowance, and exact packs of laminate, LVT, or vinyl flooring you need to buy.
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Gross Margin Calculator
Enter a selling price and the cost of goods sold to find your gross margin — and the equivalent markup, side by side.
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Hourly to Salary Calculator
Work out the annual, weekly, and monthly equivalent of an hourly rate — at any working pattern, gross of tax.
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Loan Repayment Calculator
Work out your monthly payment on a personal loan, car finance, or debt consolidation — and see how paying a little extra each month gets you debt-free sooner.
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Markup Calculator
Enter cost and selling price to find the markup percentage — and the gross margin it works out to, side by side.
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Meeting Cost Calculator
Work out the real cost of a meeting in pounds — and watch it tick up live as the meeting runs. Especially eye-opening for recurring weekly standups.
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Mortgage Payment Calculator
Work out your monthly mortgage payment, total interest, and loan-to-value ratio — and see how overpaying could shorten your term and save you thousands.
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Moving Cost Calculator
Get a rough estimate of your removals cost based on home size, hours, and distance — with a typical low–high range.
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Notice Period Calculator
Find out your last working day from the date you hand in notice and your contractual notice period.
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Paint Calculator
Work out how much paint you need for a room — given wall dimensions, doors, windows, and the number of coats.
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Percentage Calculator
Work out a discount, a price change, a margin, or any other percentage in seconds — five tools on one page.
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Rent Affordability Calculator
Work out how much rent you can comfortably afford from your gross income — at the 30% rule of thumb or any other threshold.
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Reverse VAT Calculator
Have a VAT-inclusive price? Work backwards to find the net amount and the VAT — at 20%, 5%, or any other rate.
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Running Pace Calculator
Calculate running pace, time, or distance from any two of the three — with race-time projections for 5K, 10K, half marathon, and marathon.
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Salary to Hourly Calculator
Convert an annual salary to an hourly, weekly, and monthly figure — at any working week, gross of tax.
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Steps to Miles Calculator
Turn step counts into distance — at walking, jogging, or running pace — using a stride estimate from your height.
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VAT Calculator
Add VAT to a net price, or work out the net from a VAT-inclusive total — at 20%, 5%, or any other rate.
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Working Days Calculator
Count working days (Monday to Friday) between two dates — with optional UK bank holiday exclusion.
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Why use Online CalcKit?
- • No sign-up, no tracking-heavy ads — just clear answers.
- • Mobile-friendly: get a result on your phone in seconds.
- • Plain-English explanations of what each number means.
- • Region-specific defaults, currency, and tax labels for United Kingdom.