Compute running pace and speed from distance and time in km or miles. Check splits for a 5K tune-up — free, local, no signup.
Convert step counts to kilometers and miles plus calorie estimates from height-based stride. Log daily steps with distance context — free, local, no signup.
Estimate cycling burn from weight, speed, and distance with speed-based MET bands. Price a 40 km weekend ride in calories — free, local, estimate only.
Compute ideal sleep bedtimes counting back in 90-minute cycles — whole and half-cycle rows (2 to 5 cycles) minus a 15-minute buffer. Wake refreshed at cycle ends, not mid-dream — free, local, no signup.
Estimate travel time from distance and speed — with optional arrival time and traffic buffer. Add traffic buffers and arrival targets for realistic plans — free, local, no signup.
Compute semester GPA from course grades and credit hours with weighted math. Students check what an A in a 4-credit lab does before finals — free, no signup, runs locally.
Total minutes divided by distance: 5 km in 25 minutes is exactly 5:00/km at 12.00 km/h. Enter hours, minutes, and seconds separately for precise splits.
Both — toggle the unit and the same time converts: 5:00/km equals about 8:03/mi. Even pacing beats fast starts — first-km discipline decides finish times.
Presets cover 5K in 25 min, 10K in 50 min, and marathon 42.2 km in 3:30 (4:59/km). Start from one and adjust the time to your own target.
No — math runs locally in your browser. Nothing leaves your device.
Heart Rate Zone Calculator
Calculate heart rate training zones by age. Find your target heart rate ranges for different exercise intensity levels. Health data never leaves your device — every calculation runs locally in your browser.
Steps to Distance
Convert step counts to kilometers and miles plus calorie estimates from height-based stride. Log daily steps with distance context — free, local, no signup.
Last updated October 2026