Pace Calculator
Solve for pace, time, or distance — then see your estimated finish times.
Solve for Any Value
Enter any two fields — the third will be calculated.
Estimated Finish Times
Based on your pace above. Update the table any time.
| Distance | −10 s | −5 s | Target | +5 s | +10 s |
|---|---|---|---|---|---|
| Enter a pace and press Go | |||||
How the Math Works
Pace = Time ÷ DistanceDivide total seconds by kilometres (or miles) to get seconds per unit, then format as mm:ss.
Time = Pace × DistanceMultiply pace (in seconds/unit) by distance to get total seconds, then convert to hh:mm:ss.
Distance = Time ÷ PaceDivide total seconds by pace (in seconds/unit) to get the distance covered.
Why Use a Running Pace Calculator?
Whether you’re training for your first 5K or aiming for a personal best in the marathon, knowing your running pace is essential. A pace calculator takes the guesswork out of your race strategy by instantly determining:
- Your Target Pace: If you have a specific finish time in mind, calculate exactly how fast you need to run each kilometre or mile.
- Your Finish Time: Wondering what your finishing time will be if you run a 5:30 min/km pace? Our tool estimates your total time instantly.
- Your Distance: If you ran for 45 minutes at a steady pace, find out exactly how far you travelled.
How to Calculate Running Pace
Your running pace is the average amount of time it takes to cover a specific distance (usually a mile or a kilometre). The mathematical formula is simple:
Pace = Time ÷ Distance
For example, if it takes you 50 minutes to run 10 kilometres, your pace is 50 ÷ 10 = 5:00 min/km. Our calculator handles all the complicated conversions between hours, minutes, and seconds so you can focus entirely on your training plan.
Planning for Popular Race Distances
Understanding how your pace scales across different distances is crucial for avoiding burnout on race day. Use the Estimated Finish Times table above to see how a consistent pace translates to standard distances:
- 5K (5 kilometres / 3.1 miles): A fast, high-intensity distance. Often used as a benchmark for your aerobic capacity.
- 10K (10 kilometres / 6.2 miles): Requires a balance of speed and endurance. Your 10K pace is typically slightly slower than your 5K pace.
- Half Marathon (21.1 kilometres / 13.1 miles): An endurance event where pacing strategy becomes critical to avoid “hitting the wall.”
- Marathon (42.2 kilometres / 26.2 miles): The ultimate test of aerobic endurance. Even a 5-second difference per kilometre can heavily impact your final finish time.
By regularly tuning your target pace based on your recent training runs, you can set realistic, achievable goals for your upcoming races.
Frequently Asked Pacing Questions
Q: How fast do I need to run a 25-minute 5K?
To run a sub-25 minute 5K, you need to maintain an average pace of 5:00 min/km (or about 8:03 min/mile).
Q: What pace is a sub-4 hour marathon?
Breaking the 4-hour marathon barrier requires an average pacing of 5:41 min/km (or 9:09 min/mile) for the entire 42.2 kilometres. It’s often recommended to train at a slightly faster pace to account for water station slowdowns.
Q: How fast do I need to run a 50-minute 10K?
You will need to run exactly 5:00 min/km (or 8:03 min/mile) to hit 50 minutes flat.
Q: What pace do I need for a 2-hour half marathon?
To break the 2-hour mark in a half marathon (21.1 km), you need to maintain an average pace of 5:41 min/km (or 9:09 min/mile). Fun fact: this is the exact same pace required for a sub-4 hour full marathon!
Q: What is a “good” running pace for a beginner?
For a beginner, a conversational pace (where you can speak full sentences without gasping) is ideal. This typically falls anywhere between 6:00 to 7:30 min/km (9:30 to 12:00 min/mile), but this varies greatly based on age, fitness level, and terrain. Always prioritize consistency over speed when starting out!
Q: Is there a smarter way to predict my race times than doing the math?
Absolutely! While a simple pace calculator is great for basic math, a real race prediction requires analyzing your personal training history. The Apex Run app includes a built-in Race Predictor feature that automatically evaluates your past runs, current fitness level, and recovery metrics to forecast your finish times for 5Ks, 10Ks, half marathons, and full marathons—without you calculating a thing!