Speed Converter
Articles, guides, and in-depth tips for the Speed Converter — everything you need to get the most out of it.
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Triple Your Speed, Use 27 Times More Power — The Physics of Aerodynamic Drag and Why High-Speed Transport Is So Hard
Why Mach 1 at Cruising Altitude Is 163 km/h Slower Than Mach 1 at Sea Level — Aviation Speed Explained
Mach 1 at sea level is 1,225 km/h; Mach 1 at cruising altitude is only 1,062 km/h — because the speed of sound decreases with temperature, and temperature drops with altitude. Mach number is more useful than km/h for aviation because it directly measures proximity to compressibility effects. Here's the four speed regimes (subsonic, transonic, supersonic, hypersonic), why swept wings delay transonic effects, and why both aviation and maritime navigation use knots for the same geometric reason.
Why 60 km/h on a Narrow Road Feels Faster Than 100 km/h on a Motorway: The Psychology of Speed
A Formula 1 car's 360 km/h and a narrow country road's 60 km/h can feel similarly alarming — because speed perception isn't a direct reading of velocity. It's constructed from optic flow (how fast the visual scene changes), reference objects, and adaptation state. Here's why motorways feel slower than they are, the speed-adaptation illusion at exits, and why knots and Mach aren't just alternative units but reflect physically meaningful properties of their respective domains.
Animal Speeds and the Physics of Locomotion: Why Cheetahs Tire in 30 Seconds and Humans Are Elite Endurance Runners
A cheetah can't outsprint a horse over a mile, and a peregrine falcon at 320 km/h is faster than both but only in a gravity-assisted dive. Here's why cheetahs tire after 30 seconds, how the pronghorn evolved to outrun extinct North American cheetahs, and why humans are actually elite endurance animals.
The Physics of Speed Limits: Stopping Distances, Kinetic Energy, Knots, and Mach
Stopping distance scales with the square of speed — going from 30 mph to 40 mph increases stopping distance by 57% and kinetic energy by 78%. Here's the physics behind speed limits, why knots are used at sea and in aviation, and what Mach numbers mean.
Speed Converter — km/h, mph, m/s & Knots for Roads, Weather & Sports
Learn speed unit conversions (km/h, mph, m/s, knots), road trip speed limit equivalents, cyclone wind speeds, sports performance benchmarks, and why aviation uses knots — with a free speed converter.
Speed Converter — km/h, mph, m/s, Knots & Mach Explained
Learn how to convert between km/h, mph, m/s, and knots — with real examples for driving abroad, weather forecasts, aviation, and physics — plus a free speed converter.
