Converters

Learn pressure unit relationships (Pa, kPa, bar, PSI, atm, mmHg), tyre pressure conversion, blood pressure interpretation, weather forecasting, and the difference between absolute and gauge pressure — with a free converter.

Learn how data storage units work, why your 1 TB drive shows as 931 GB, the difference between bits and bytes, and how to convert between any storage unit with a free converter.

Nanoseconds define CPU cache speeds; milliseconds define user experience; microseconds determine whether distributed database clocks can be trusted. Here's the computing time hierarchy, NTP clock synchronisation, why leap seconds cause outages, and what P99 latency means.

Learn why cooking measurements cause confusion across countries, what differs between US and Australian tablespoons and UK vs US pints, why weight beats volume for baking, and how to convert any recipe with a free cooking converter.

Doubling a recipe doesn't mean doubling every ingredient by the same factor — salt and spices that taste "right" at 1x can taste over-seasoned at a linearly-doubled 2x, leavening agents commonly scale by 75-90% rather than 100%, and baking time scales by far less than 2x because heat penetration relates to thickness squared, not to volume. Here's why each of these deviates from linear scaling, and why pan-size choice is inseparable from baking-time expectations.

A unit confusion caused the $327 million Mars Climate Orbiter to crash in 1999. Here's why metric dominates engineering globally, how manufacturing tolerances work, what CNC achieves, and why the US never fully metricated.

Your "100 Mbps" plan and your download manager's "12 MB/s" aren't a problem — they're almost exactly the same number, because internet speeds are measured in bits and file sizes in bytes, an 8x difference. Here's the Mbps-to-MB/s conversion, why "theoretical maximum" and "actual" speed differ for reasons unrelated to units (overhead, server limits, Wi-Fi, "up to" advertising), and why upload speeds are often a separate, much lower number worth checking.

Radio waves, WiFi, visible light, X-rays, and gamma rays are all the same phenomenon at different frequencies. Here's the full electromagnetic spectrum, why 5G uses higher frequencies than 4G, what WiFi bands mean, and why ionising radiation is dangerous when radio waves aren't.

Learn how to convert between millimetres, centimetres, metres, kilometres, inches, feet, yards, and miles — with real examples for construction, furniture, running, and everyday use.

Learn the US vs UK volume measurement differences, why a UK pint is 20% larger than a US pint, how to convert cups and gallons for cooking and fuel, and how to use a free volume converter for any scenario.