Quick, free tools for the maths you actually need. No ads, no tracking, no nonsense.
Instant results — no page load needed
Compare two sizes to find the better deal.
Full-page tools with detailed breakdowns
Repayment calculator with stamp duty, LTV ratio and amortisation table.
See how your money grows with visual charts and year-by-year breakdown.
2025/26 tax bands, NI, student loan, pension — full take-home breakdown.
NHS categories, healthy weight range, metric and imperial support.
Add or remove VAT at any rate. Quick lookup grid for common amounts.
60+ units across 7 categories. Instant conversion with formulas shown.
Calcify helps you make better buying decisions with instant, free calculators. Whether you're comparing perfume prices to find the best cost per ml, working out eBay fees before listing, or splitting a restaurant bill — we've got you covered.
Our cost per ml calculator is especially popular with fragrance buyers comparing different bottle sizes. Is the 200ml really better value than the 100ml? Plug in the numbers and find out in seconds.
All calculators work instantly in your browser. No sign-up, no ads, no data collection. Just quick maths when you need it.