Norwegian 4x4 Pace Calculator: Speed & Interval Distance
Turn a pace you already know into treadmill speed and distance for each four-minute interval. Enter a 5K time, mile pace or treadmill speed below. The results are unit conversions, not a test of your fitness or a target you must hit.
Published September 12, 2026 · Last updated October 23, 2026 · By Archline Labs LLC · Editorial methodology
Calculate your pace and four-minute distance
Use decimal minutes: 25:30 = 25.5 minutes; 8:30/mile = 8.5. All values stay in your browser.
Enter a positive value equivalent to 1–35 km/h. Check your units and decimal minutes.
This converts your reference pace; it does not predict the speed that will put you in your heart-rate zone. Begin conservatively, then adjust by effort and heart rate across all four intervals.
Put your pace into a guided workout
Use your result as a starting reference. Ramp4x4 guides the interval timing and heart-rate targets on iPhone and Apple Watch; adjust your pace as your effort changes.
Choose a starting pace you can repeat
A recent 5K gives a familiar reference, not a prescribed 4x4 pace. If you are unsure, start slower than that reference. Keep the first interval controlled and adjust only after your breathing and heart rate have had time to respond. On later intervals, reduce speed if you cannot repeat the full four minutes with stable form.
How the calculation works
5K speed in km/h = 300 ÷ finish time in minutes. Pace in seconds per kilometre = 3600 ÷ km/h. One mile is 1.609344 km. Four-minute distance = speed × 4/60. A 25-minute 5K is 12 km/h, 5:00/km and 800 metres in four minutes at that same pace. These are unit conversions, not a prediction of fitness or VO2 max.
Heart rate decides the adjustment
The usual work target is 85–95% of maximum heart rate, but heart rate rises gradually. Avoid sprinting to force it into the band at the start. See NTNU CERG's interval guidance and our seven-workout heart-rate analysis, which is an individual example rather than a population benchmark.
Treadmill or outdoor running?
Use the treadmill speed and incline guide for console settings, or the running guide for terrain and pacing. Incline, heat, fatigue and fitness can change the effort at the same speed.