Running Pace Calculator

Calculate pace, finish time, or distance, plus predicted race times for every distance.

Find Pace

Find Finish Time

Find Distance

Race Distance

5K

10K

Half

Full

Finish Time

Hrs

Min

Sec

Race Distance

5K

10K

Half

Full

Your Pace (per km)

Min

Sec

Time Ran

Hrs

Min

Pace (per km)

Min

Sec

Calculate

Your Pace-min/km

Predicted Race Times

Recalculate

Quick Start Guide

1. 1 Select Your Mode: Choose one of the three tabs at the top: Find Pace, Find Finish Time, or Find Distance depending on what data you want to calculate.
2. 2 Choose a Distance: Tap one of the quick-select race benchmarks (5K, 10K, Half, or Full Marathon) or input your specific targets in the panel.
3. 3 Enter Your Metrics: Fill in your hours, minutes, or seconds using the clean numerical fields provided.
4. 4 Hit Calculate: Tap the main calculation button to instantly reveal your custom target split alongside a full breakdown of predicted race finish times for alternative distances.

Pro Pacing Tip The race predictions utilize the Riegel formula. For the most accurate estimations, make sure the benchmark performance you enter comes from a recent, similarly paced training block or competitive event.

Running Pace Calculator: Find Your Perfect Training and Race Pace

Pace is the language of running. Whether you are training for your first 5K or chasing a marathon PR, knowing your pace — and what it predicts for other distances — is one of the most useful pieces of data a runner can have. This calculator works three ways: find your pace, predict your finish time, or calculate how far you ran.

The Relationship Between Pace and Distance

A common mistake among newer runners is training at race pace every run. This approach leads to burnout, overuse injuries, and frustratingly slow progress. Elite runners know that the vast majority of training miles should feel easy — significantly slower than race pace.

The 80/20 principle holds across almost every level of running performance. About 80 percent of weekly mileage should be at a comfortable, conversational pace — which corresponds to Zone 2 on your heart rate scale. The remaining 20 percent is where the hard work happens: tempo runs, intervals, and race-pace efforts in Zones 4 and 5.

Knowing your pace from a recent race or time trial lets you calculate what your easy training pace should actually be. For most runners, the easy pace is 60 to 90 seconds per mile slower than 5K race pace. Many runners are genuinely surprised by how slow this feels — and how much better they perform when they respect it.

Using the Riegel Formula for Race Predictions

The calculator uses the Riegel formula to predict finish times for races of different distances. The formula accounts for the fact that longer races require proportionally more time per mile — fatigue, fueling, and pacing strategy all shift the equation. The exponent in the formula (1.06) captures this nonlinear relationship.

Race prediction formulas are most accurate when your known performance is a recent, well-paced race at a distance similar to your target. A 5K time predicts 10K times well. A 10K time predicts half marathon times reasonably well.

Training Paces for Different Goals

Once you have your baseline pace, you can derive paces for different workout types. Easy runs are conversational — full sentences with no struggle. Tempo runs are comfortably hard, sustainable for 20 to 40 minutes. Intervals are at 5K pace or faster. Long runs are at easy pace, focusing on time on feet rather than speed.

Tracking these sessions in the Weekly Workout Log gives you a record of whether you are hitting the right pace for each session type — and whether the progressive overload is happening week to week.

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Use the Running Pace Calculator above to find your pace, predict race finish times, or calculate your running distance in three different modes.