Running Pace Calculator

A running pace calculator helps you figure out how fast you're running by computing one of three variables — pace, time, or distance — when you provide the other two. It's useful for race planning, training, and tracking progress over time.

Select what you want to calculate (Pace, Finish Time, or Distance), choose your distance unit (miles or km), then fill in the two known values. The calculator will instantly compute the third value along with estimated finish times for common race distances.

The core formula is: Pace = Total Time ÷ Distance. From there, Finish Time = Pace × Distance, and Distance = Total Time ÷ Pace. All three are algebraically related, so knowing any two lets you solve for the third.

A good 5K time varies by fitness level. Beginners often target 10–12 min/mile (37–45 minutes total), intermediate runners aim for 8–10 min/mile (25–37 minutes), and competitive runners look to break 7 min/mile (under 22 minutes). Any pace that challenges you personally is a good pace.

To finish a marathon in exactly 4 hours, you need to maintain a pace of approximately 9:09 per mile or 5:41 per kilometer. Even a few seconds per mile faster can provide a comfortable cushion for rest stops or slower miles.

Pace is expressed as time per unit distance (e.g., 8:30 per mile), while speed is expressed as distance per unit time (e.g., 7 mph). Runners typically use pace because it's easier to monitor during a run — a slower pace number means you're running faster.

Use whichever unit matches your training environment and race events. Most US-based runners use miles, while runners in most other countries and international races typically use kilometers. This calculator supports both — just select your preferred unit at the top.

Yes. The pace/time/distance formula works for any consistent-speed activity. Just enter the relevant time and distance values regardless of whether you're running, walking, hiking, or cycling.