Tools
Speed tools
53 free speed tools in one place. A live GPS speedometer, unit converters, automotive and running calculators, all running in your browser with nothing to install.
Live speedometer & vehicle pages
Read your real GPS speed in the browser, with guides tuned to each vehicle.
- GPS Speedometer The live speedometer. Real-time GPS speed in MPH or KPH, no install.
- GPS accuracy test Your live accuracy radius, rated, with update rate, altitude and heading.
- GPS coordinates finder Find, convert, copy, and share latitude and longitude in DD, DMS, and DDM.
- Motorcycle speedometer Live GPS speed plus why bike dashes over-read 5 to 10 percent.
- Bicycle speedometer GPS speed with no wheel magnet or circumference calibration.
- Boat speedometer Speed Over Ground for boats, kayaks, and jet skis.
- Online odometer GPS trip meter: distance travelled, elapsed time, average and top speed.
- Drive time by distance How long a drive takes, from 1 to 1000 miles, with a table by average speed.
- Car speed test Check your car speedometer accuracy against GPS in 10 minutes.
- Train speed test Measure train speed through the window with phone GPS.
Speed unit converters
Convert between every common speed unit, live.
- Speed converter (all units) mph, km/h, knots, m/s, fps, and Mach in one live tool.
- MPH to KPH Miles per hour to kilometers per hour, with table.
- KPH to MPH Kilometers per hour to miles per hour, with table.
- Knots to MPH Nautical miles per hour to mph.
- Knots to KPH Nautical miles per hour to km/h.
- m/s to MPH Meters per second to miles per hour.
- m/s to KPH Meters per second to kilometers per hour.
- FPS to MPH Feet per second to miles per hour, with 88 fps = 60 mph.
- Mach to MPH Mach number to miles per hour at sea level.
- Wind speed converter mph, km/h, knots, m/s, and the Beaufort scale.
- Running pace converter min/km, min/mile, mph, and kph, all linked.
Automotive calculators
Acceleration, drag racing, gearing, tires, fuel, and braking.
- 0-60 mph calculator Acceleration time, g-force, and 0-100 km/h equivalent.
- Quarter mile calculator 1/4 mile ET and trap speed from weight and horsepower.
- Gear ratio calculator Road speed from RPM, tire size, gear, and final drive.
- Tire size calculator Speedometer error from a tire or wheel change.
- Speedometer error calculator Dashboard vs GPS: your error percentage and a correction table.
- MPG calculator Fuel economy across MPG, L/100km, km/L, plus trip cost.
- MPGe to kWh/100mi converter EV efficiency across MPGe, kWh/100mi, Wh/mi, mi/kWh, kWh/100km.
- EV charging stop calculator How cruising speed changes your stops and your arrival time.
- Stopping distance calculator Reaction plus braking distance by speed and surface.
- Road trip cost calculator Fuel, driving time, MPG, and L/100 km for four countries.
- UK speeding fine calculator Estimate the England and Wales court band, fine, points, or ban.
- Australia speeding fine calculator Indicative offence band, demerits, and suspension risk by state.
- Canada speeding fine calculator Provincial offence band, demerits, and excessive-speed risk.
Running & fitness
Pace, race prediction, heart rate, and calories.
- Marathon pace calculator Required pace and splits for any race distance.
- Race time predictor Predict 5K, 10K, half, and marathon from one result.
- Multipoint pace calculator Segment splits and average pace across checkpoints.
- Heart rate zones calculator 5 training zones in bpm from your age.
- Calories burned running MET-based kcal from weight, distance, and pace.
- Calories burned cycling MET-based kcal with road grade adjustment.
RV, towing & camping
Match a tow vehicle, plan state rules, budget the drive, and size off-grid resources.
- RV towing capacity calculator Check payload, tow rating, GVWR, and GCWR together.
- Trailer tongue weight calculator Compare hitch or pin weight with the loaded trailer.
- RV payload calculator Subtract passengers, cargo, hitch, and tongue weight.
- RV trip cost calculator Towing fuel, campground nights, propane, fees, and tolls.
- Towing speed limits by state Search trailer speed rules across all 50 states.
- Trailer brake laws by state Compare common thresholds and performance-based rules.
- RV water tank calculator Fresh-water days, reserve, and carried water weight.
- RV solar calculator Estimate panels, battery amp-hours, and inverter size.
- RV generator size calculator Running watts, startup surge, and 30 vs 50 amp context.
- Boondocking calculator Find whether water, waste, battery, or propane runs out first.
Physics & general
The everyday speed, distance, and time math.
Guides & reference
The background reading behind the tools.
- How GPS speed works The satellite physics behind your phone speed reading.
- Google Maps speedometer Turn it on for iPhone or Android, and fixes when it does not show.
- Blog Articles on GPS accuracy, calibration, and speed.
- Speed limits by country Urban, rural, and motorway limits for 18 countries.
- US state speed limits Interstate, city, and school-zone limits state by state.
- US city speed limits Street, school-zone, and highway limits city by city.
- Speeding ticket cost What a ticket really costs by state, speed, and zone.
- UK van speed limits Motorway, dual and single carriageway limits by van type.
- UK towing speed limits Caravan and trailer speed and motorway lane rules.
- Australia school zone times Typical active hours, speeds, and exceptions by state.
- Canada school zone limits School-zone speeds and activation rules by province.
- Speeding ticket points by state How all 50 states treat an ordinary speeding conviction.
- Reckless driving speed by state Notable statutory thresholds and high-speed criminal risk.
- How fast does a golf cart go Speeds by cart type, standard to street-legal LSV.
- Average walking speed MPH by age and pace, plus how to measure yours.
- Average running speed MPH by fitness level, beginner to elite.
- What does X mph feel like Sensory context for 30, 60, 100, and 200 mph.