From quick unit changes to complex engineering conversions, our free online conversion calculators give you precise answers instantly. Choose a tool, enter your values, and get clean, step-by-step results—no sign-up, no fuss. Perfect for students, shoppers, travellers, tradespeople, and anyone who needs reliable numbers on the spot.
Units: length, area, volume, weight/mass, temperature, speed, pressure
Math & angles: degrees ↔ radians, gradients, trigonometry helpers
Time: time zones, time add/subtract, days between dates
Finance: VAT/sales tax, currency (daily rates), discount/markup
Data & digital: bytes, KB/MB/GB/TB, bandwidth, DPI/PPI
Everyday: cooking measures, shoe/clothing sizes, paper sizes
Accurate: trusted formulas & up-to-date factors
Fast: answers in milliseconds with clear rounding
Flexible: switch units on the fly, copy results in one click
Friendly: mobile-ready layout and accessible design