Calculators that just work.
Fast, accurate tools for freelancers, your money, and home projects — answers as you type, on any device.
Browse calculators ↓Personal Finance
Compound Interest Calculator
See how much your savings or investment grows over time with compound interest and regular monthly contributions.
Open calculator →Loan Repayment Calculator
Work out your monthly repayment on a loan or mortgage from the amount, interest rate, and term.
Open calculator →Savings Goal Calculator
Find out how much to save each month to reach a savings target by a set date.
Open calculator →Home & DIY
Appliance Running Cost Calculator
Work out what any appliance costs to run per hour, day, month and year, from its wattage and your electricity unit rate.
Open calculator →Flooring Cost Calculator
Estimate the total cost of flooring a room from its area and the price per square metre.
Open calculator →Heat Pump Running Cost Calculator vs Gas Boiler
Compare what a heat pump costs to run against a gas boiler, using your own heat demand, COP and current unit rates.
Open calculator →Is a Heat Pump Worth It in 2026? Grant & Payback Calculator
See if a heat pump is worth it in 2026 with the current UK Boiler Upgrade Scheme grant (£7,500) or the US $2,000 federal credit applied. Calculates your real payback period.
Open calculator →Paint Coverage Calculator — How Much Does a Tin Cover?
How much does 5L of paint cover? Work out the area a tin of paint covers in square metres, for any tin size, number of coats and surface type.
Open calculator →Paint Quantity Calculator
Estimate how many litres of paint you need for a room based on wall area, number of coats, and paint coverage.
Open calculator →Solar Panel Payback Calculator
Free solar panel payback calculator. Work out your solar payback period year by year, with UK and US 2026 incentives, rising energy prices and panel degradation included.
Open calculator →Are Solar Panels Worth It in the UK in 2026?
Is solar worth it in the UK in 2026? See your lifetime return after the 0% VAT relief, rising energy prices and panel degradation — not just the payback year.
Open calculator →Wallpaper Calculator — How Many Rolls Do I Need?
Work out how many rolls of wallpaper you need from your room dimensions, allowing for pattern repeat and wastage.
Open calculator →Freelance & Business
Freelance Day Rate Calculator
Work out the day rate you need to charge to hit your target annual income, accounting for unpaid days, expenses, and tax.
Open calculator →Hourly to Salary Calculator
Convert an hourly wage into an equivalent annual salary based on the hours you work each week.
Open calculator →Profit Margin Calculator
Calculate your gross profit and profit margin percentage from revenue and cost.
Open calculator →VAT Calculator
Add or check VAT on a price. Works out the VAT amount and the gross total from a net figure.
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