Training Pace Calculator - Race Time to Zone Pace Chart

A training pace calculator is a running tool that turns one recent race time into a personal chart of five training pace zones - Easy, Marathon, Threshold, Interval, and Repetition - so every workout is paced to your current fitness instead of guesswork. Enter a 5K, 10K, half marathon, or marathon result and you get back per-mile or per-kilometer paces plus equivalent times at other race distances, which removes the math you would otherwise do by hand before every interval session.

• • Plan a weekly training block: Use your easy and threshold paces to schedule long runs, tempo runs, and recovery days without re-checking a paper pace chart.
• • Predict equivalent race times: Convert a recent 10K finish into a predicted half marathon or marathon time so you can pick realistic goal races for the season.
• • Pace interval workouts: Use the Interval and Repetition pace outputs to dial in track repeats and short hill sprints without overshooting your target effort.
• • Switch between mile and kilometer paces: Toggle the output unit between min/mile and min/km when your watch, club, or training plan uses a different measurement system.

Most runners anchor training pace to a recent race because race effort is reproducible and already calibrated to current VO2max. The calculator uses that anchor to derive a threshold velocity and widens the chart into the slower Easy and Marathon paces and faster Interval and Repetition paces of a Daniels training week.

Re-run the calculator at the start of your cycle and after every key race so paces track real fitness.

If you want split-by-split race execution in addition to a zone chart, our Running Pace & Race Split Calculator turns the same finish time into per-mile splits for race day.

The training pace calculator combines a basic time-and-distance formula with Riegel's 1981 race-time scaling model and Jack Daniels' VDOT intensity framework so the outputs trace back to peer-reviewed endurance science.

• Race distance: Miles of the anchor race. Use 3.107 for 5K, 6.214 for 10K, 13.109 for half marathon, 26.219 for marathon.
• Finish time: Total time in hours, minutes, and seconds for the anchor race.
• Zone model: Daniels' VDOT zones (recommended) or Riegel scaling for equivalent race times.
• Pace unit: Display paces in minutes per mile or minutes per kilometer.

Every result traces to your anchor race, so a 5K upgrade from 25:00 to 22:30 moves the entire chart instead of staying frozen.

According to V.O2, Daniels' training pace zones sit at 59-74% of vV̇O2max for Easy, 75-84% for Marathon, 83-88% for Threshold, and 97-100% for Interval; the calculator's 70/80/86/98% midpoints sit at the centers of those published ranges.

According to V.O2 (Jack Daniels' VDOT running app), Daniels' Easy/Marathon/Threshold/Interval zones sit at 59-74%, 75-84%, 83-88%, and 97-100% of vV̇O2max; the 70/80/86/98% midpoints of those ranges are the values the calculator uses to anchor each weekly zone.

Once you know your Marathon zone pace, the Marathon Pace Calculator builds full per-mile and per-kilometer splits for a goal marathon time.

These four concepts show up in every explanation of training pace zones and in every coach's pacing language, so it helps to anchor them once before you start using the chart.

A 'tempo run' almost always means threshold pace. 'Mile repeats' usually mean interval pace. A simple 'easy run' should match the easy pace output.

Re-run the calculator after every key race so the zones track real fitness changes; a chart built in April is rarely accurate for October.

Pace zones work best when paired with heart rate zones, so cross-check the chart with our Target Heart Rate Calculator for a full effort picture.

The calculator is built for runners who already have a recent race result and want a pace chart in under a minute.

1. 1 Pick your anchor race: Choose the most recent 5K, 10K, half marathon, or marathon result that reflects your current fitness, not a personal best from five years ago.
2. 2 Enter race distance: Type the distance in miles, or use a custom distance in miles if you raced a non-standard event like a 10-miler or 25K.
3. 3 Enter your finish time: Type the hours, minutes, and seconds from your anchor race. A 25:00 5K is 0 hours, 25 minutes, 0 seconds.
4. 4 Choose your pace unit and zone model: Switch between min/mile and min/km, and pick Daniels' VDOT zones or Riegel scaling for equivalent race times.
5. 5 Read your pace chart: The calculator returns Easy, Marathon, Threshold, Interval, and Repetition paces plus equivalent 5K, 10K, half marathon, and marathon times.
6. 6 Save the chart and re-run after key races: Screenshot or write the paces into your training log. Re-run the calculator after your next key race so the chart tracks real fitness changes.

A runner with a 22:30 5K wants a pace chart for the week. They enter 3.107 miles and 22:30 into the calculator, leave Daniels' zones selected, and get an Easy pace near 10:30, a Threshold pace near 8:30, and an Interval pace near 7:30, which they paste into Monday's tempo and Wednesday's interval workouts.

After your chart prints, dial in your goal race with the Half Marathon Pace Calculator so every workout lines up with your actual race plan.

A pace chart removes the largest source of failed workouts - running every day at roughly the same effort - and replaces it with specific targets you can actually hit on the track or trail.

• • Replaces guesswork with real numbers: Easy, tempo, and interval paces tie back to one anchor race, so you stop picking arbitrary targets and start running the pace your fitness supports.
• • Builds balanced training weeks: A pace chart makes it obvious when a week is too tempo-heavy or has too much easy mileage, because each workout type has its own dialed-in pace.
• • Reveals realistic race goals: Equivalent 5K, 10K, half, and marathon times let you pick goal races that match your current fitness instead of your hopeful ceiling.
• • Speeds up interval workouts: Interval and Repetition paces remove the on-track math, so you hit the right splits on the first 400 m instead of course-correcting by rep three.
• • Travels with you across units: Switching between min/mile and min/km means the same chart works in Europe, the US, or mixed training plans without re-typing numbers.
• • Tracks real fitness changes: Re-running after every key race keeps the chart honest, so training paces tighten when you get fitter instead of staying frozen to an old goal.

Runners who pace every workout by chart spend more days in the right zone, the largest predictor of consistent progress over a season.

The chart also gives a quick sanity check for any coach-assigned workout; if the prescribed pace is wildly different, ask before starting.

Pair the chart with our Running Calorie Calculator to estimate how many calories each paced workout will burn at your new zone targets.

A pace chart is a snapshot of one anchor race, so the inputs and assumptions you bring to the calculator shape how accurate the outputs are in real workouts.

• • The calculator assumes recreational runner physiology; sub-elite paces (under about 4:30 min/mile for men and 5:00 for women) should be treated as estimates.
• • Equivalent race times use Riegel's 1981 scaling, which under-predicts ultra distances; treat the marathon equivalent as a marathon estimate and longer custom distances as ultra estimates.
• • The chart assumes a flat, calm-weather race. If your anchor was run in 80-degree heat or on hills, scale your paces a few seconds slower until you re-anchor on calmer conditions.

According to Riegel (1981), in American Scientist, race time scales with distance to roughly the 1.06 power; the same 1.06 exponent is what this calculator uses to predict equivalent 5K, 10K, half, and marathon times, while longer custom distances are labeled as ultra estimates because the original model fits the mile-to-marathon range best.

According to NIST, one international mile equals exactly 1.609344 kilometers, which is the conversion constant used to switch between minutes per mile and minutes per kilometer pace outputs.

If your Interval and Repetition paces feel awkward, use the Stride Length Calculator to check whether your stride length matches your new zone targets.