Speed Calculator

Speed Calculator is a clean, fast tool for working out speed, distance and time — and for converting between speed units — completely offline. Whether you are planning a drive, checking a runner's pace, or doing physics homework, this app gives you the answer the moment you type.

ONE RELATIONSHIP, THREE ANSWERS
Speed equals distance divided by time. Tell the app which one you are solving for, enter the other two, and it does the rest:
• Speed = distance ÷ time
• Distance = speed × time
• Time = distance ÷ speed

MIX AND MATCH UNITS
Every field has its own unit, so you can combine them freely:
• Distance: meters, kilometers, miles, feet
• Time: seconds, minutes, hours
• Speed: m/s, km/h, mph, knots, ft/s
Behind the scenes everything is converted to metres and seconds, so a result is always correct no matter how you mix the units. Your answer is shown in the unit you choose, with a couple of handy equivalents alongside.

SPEED UNIT CONVERTER
A dedicated Convert tab turns any speed into every other unit at once — m/s, km/h, mph, knots and ft/s — perfect for quick checks.

LEARN AS YOU GO
A built-in Learn tab explains, in plain language, the speed–distance–time triangle, the difference between average and instantaneous speed, and the unit conversions worth remembering (1 m/s = 3.6 km/h, 1 knot = 1.852 km/h, and more).

CLEAR, NOT CLEVER
A time or speed of zero is rejected instead of producing a divide-by-zero error, and invalid input is flagged rather than guessed. What you see is exactly what the numbers work out to.

PRIVACY
The app collects no personal data and works fully offline — your inputs never leave your device. Ads are served by Google AdMob, which may collect and use an advertising identifier (advertising ID) and related data as described in Google's policies. The app itself requests only the INTERNET permission, used solely to load ads.

Light and dark themes, a tiny download, and no clutter. Download Speed Calculator and solve with confidence.