Ultrarunning Calculators & Planning Tools
Free interactive tools to help you plan, prepare, and execute your multiday race.
Pace a timed race
Timed-Race Pace Calculator
Calculate overall and moving pace, hourly targets, lap counts, and printable splits for 24-hour, 48-hour, and 6-day events.
Try 120 km, 24 hours, and 2 stopped hours to see moving pace and lap targets.
Plan hourly loops
Backyard Ultra Calculator
Convert yards to distance, calculate loop pace and rest time, and build a printable hourly schedule.
Try a 50-minute yard: ten minutes remain before the next bell, or seven at base with the optional three-minute corral margin.
Check a fixed-distance route
Ultra Cutoff Planner
Plan checkpoint ETAs, aid-station stops, cutoff buffers, and a printable race pace band.
Enter checkpoint distances, cutoff times, and planned stops to identify small buffers.
Compare movement patterns
Run/Walk Calculator
Calculate true combined interval pace, projected finish time, and timed-event distance.
Enter your run and walk intervals and their separate paces to see the combined pace.
Print split times
Pace Band Generator
Turn a goal time into a printable wristband of elapsed times, with even, negative or fading splits and aid-station time.
Try a 4:00 marathon at even pace, or the 100-mile example with 150 minutes of stops and a 15% fade.
Adjust for heat
Heat-Adjusted Pace Calculator
Adjust pace and finish time for temperature and humidity, dew point or a WBGT forecast, with a printable heat chart.
Try 5:30/km at 25 °C and 60% humidity to see the heat-adjusted pace and a chart for every part of the day.
Plan race fueling
Running Calorie Calculator
Estimate calories burned from weight, distance, walking and climb, then plan carbs, gels and sports drink per hour.
Try 70 kg, 160 km and 24 hours to see the calories burned, gels needed and the gap a 50 g plan leaves.
Load before the race
Carb Loading Calculator
Turn body weight into a daily carbohydrate target for the last two days, split across meals, with a sized pre-race meal.
Try 70 kg at 10 g/kg for 48 hours to see grams per day, per meal and for the race-morning meal.
Measure fluid losses
Sweat Rate Calculator
Estimate sweat rate and sodium loss from a test run, then check a race drinking plan against your losses.
Enter weights before and after a two-hour run plus what you drank to see sweat rate and sodium lost per hour.
Organize support
Crew & Drop-Bag Planner
Build a printable operations sheet for crew points, arrival windows, bags, staged items, and actions.
Add a crew point, arrival window, bag, and actions to create a printable handoff sheet.
Choose an event
Race Finder & Comparison
Filter the researched event directory and compare up to three races across course, cutoff, terrain, and support.
Select a format and region, then compare up to three matching races side by side.
Pack for the format
Gear Checklist Generator
Generate a printable gear checklist customized for your event type — 24-hour, backyard ultra, 6-day, or stage race.
Choose your event type to create a checklist you can adapt and print.