Calculators
Everyday maths with the working shown under every answer, calculated on your device as you type.
Percent of a number, what-percent and percentage change, each with the formula written out.
Monthly payment, amortisation table, overpayment savings and a borrowing estimator.
Monthly payment and true cost from amount, APR and term, plus car finance with balloons.
England and NI SDLT band by band: movers, first-time buyers and the additional-property surcharge.
UK-sensible tipping with per-person splits, and an uneven bill splitter for real tables.
Days between dates, add or subtract days, and UK working days with bank holidays.
US 4.0 scale with weighted Honors and AP modes, semester and cumulative.
Numbers to numerals and back with strict validation, date formatting and the 1-100 chart.
UK salary after tax: tax codes, Scottish bands, NI, pension, student loans, bonuses and hourly mode.
Add or remove VAT at 20%, 5%, zero or custom, with reverse and flat-rate scheme modes.
Metric and imperial including stones and pounds, NHS bands with honest caveats.
Exact age in years, months and days, age on any date, and day-of-week born.
Growth chart and year table with contributions, plus the savings-goal solver.
Being built for this category
This category is now complete, thirteen calculators from percentages to stamp duty, all above. The final phase adds utilities in other categories.