All Free Running Calculators
Browse all 115 free calculators across 13 categories. Every tool is free, works on any device, and requires no signup.
Calculate running pace, speed, finish times and split strategies for any distance.
Pace Calculator
Calculate your pace per km or mile from distance and time.
Finish Time Calculator
Predict your finish time for any distance based on your pace.
Speed Calculator
Convert between pace and speed in km/h or mph.
Race Pace Calculator
Calculate the exact pace needed to hit your race goal time.
Negative Split Calculator
Plan a negative split strategy with faster second-half pacing.
Even Split Calculator
Calculate even splits for any race distance and target time.
Pace Converter
Convert pace between min/km, min/mile, km/h and mph.
Treadmill Pace Calculator
Convert treadmill speed settings to outdoor pace equivalents.
Track Pace Calculator
Calculate lap times for track sessions at your target pace.
Interval Pace Calculator
Work out interval times for 200m, 400m, 800m and 1000m reps.
Wind Adjusted Pace Calculator
Calculate effort-equivalent pace accounting for headwind, tailwind or crosswind conditions.
Predict race times using proven formulas like Riegel, VDOT and age grading.
Marathon Time Predictor
Predict your marathon time from a shorter race result.
Half Marathon Predictor
Predict your half marathon time from 5K or 10K results.
10K Predictor
Predict your 10K time from a 5K or parkrun result.
5K Predictor
Predict your 5K time from shorter or longer race results.
Parkrun Predictor
Predict your parkrun time from other race distances.
Ultra Predictor
Predict ultra marathon times for 50K, 50mi, 100K and 100mi.
Riegel Formula Calculator
Use the Riegel formula to predict race times from any distance.
VDOT Calculator
Calculate your VDOT score and equivalent race performances.
Age Grade Calculator
Calculate your age-graded performance percentage.
Equivalent Performance Calculator
Find equivalent performances across different race distances.
Race Predictor Calculator
Predict race times from a known result using the Riegel formula with age grading.
Race Percentile Calculator
Estimate your race percentile based on finish time, age and gender with age-graded comparison.
Negative Split Calculator
Calculate first/second half target splits for negative split race strategy.
Calculate training zones, threshold paces, heart rate zones and VO2 max.
Training Zone Calculator
Calculate your training pace zones from a recent race result.
Heart Rate Zone Calculator
Calculate heart rate training zones from your max or resting HR.
Threshold Pace Calculator
Estimate your lactate threshold pace from race results.
Easy Pace Calculator
Calculate your easy and recovery run pace range.
Tempo Pace Calculator
Calculate your tempo run pace for sustained threshold training.
Interval Calculator
Calculate interval training paces for VO2 max sessions.
Long Run Pace Calculator
Calculate your ideal long run pace range for endurance building.
Recovery Pace Calculator
Calculate your recovery run pace for active rest days.
Lactate Threshold Calculator
Estimate your lactate threshold from recent race performances.
VO2 Max Calculator
Estimate your VO2 max from race results or time trials.
Training Plan Builder
Generate a structured training plan with weekly mileage progression and taper schedule.
Run/Walk Interval Calculator
Calculate run/walk interval strategy with predicted finish time and heart rate targets.
Tempo Run Pace Calculator
Calculate tempo training pace from a recent race performance with session suggestions and heart rate targets.
Treadmill Incline Equivalence Calculator
Find the treadmill incline that matches your outdoor running effort with equivalence recommendations.
Long Run Fuelling Calculator
Calculate carb/fluid intake timing during long runs based on pace, duration, and conditions.
Jack Daniels VDOT Calculator
Calculate VDOT score and training paces from a recent race result using the Daniels method.
Tempo Run Calculator
Calculate tempo run pace ranges from recent 5K/10K time with warm-up/cool-down structure.
Calculate running distances, weekly mileage, elevation adjustments and track lanes.
Running Distance Calculator
Calculate distance covered from pace and time.
Weekly Mileage Calculator
Plan your weekly mileage across training days.
Monthly Mileage Calculator
Calculate your total monthly running volume.
Annual Mileage Calculator
Project your total annual running distance from weekly averages.
Elevation Gain Calculator
Calculate equivalent flat distance for hilly runs.
Trail Distance Calculator
Adjust trail distances for elevation and terrain difficulty.
GPS Accuracy Calculator
Estimate GPS measurement error on your running routes.
Route Planner Calculator
Calculate out-and-back or loop distances for your target mileage.
Track Lane Calculator
Calculate the exact distance for each lane on a standard track.
Stride Length Calculator
Calculate your stride length from steps and distance.
Ultra Checkpoint Calculator
Calculate checkpoint arrival times and cut-off margins for ultra marathons.
Calculate calorie burn, hydration needs, race nutrition and fuelling strategies.
Calorie Burn Calculator
Calculate calories burned during a run based on weight and pace.
Hydration Calculator
Calculate how much fluid you need before, during and after running.
Carb Loading Calculator
Calculate carbohydrate intake for race-week carb loading.
Race Nutrition Calculator
Plan your race-day fuelling strategy with gels, drinks and snacks.
Electrolyte Calculator
Calculate electrolyte replacement needs based on sweat rate.
Energy Gel Calculator
Calculate how many energy gels you need for your race distance.
Pre-Run Meal Calculator
Calculate when and how much to eat before a run.
Post-Run Recovery Calculator
Calculate your post-run protein and carb recovery needs.
Weight Loss Calculator
Calculate how running contributes to your weight loss goals.
BMR Calculator
Calculate your basal metabolic rate and daily calorie needs as a runner.
Track shoe mileage, find your size, plan rotations and gear up for any conditions.
Shoe Mileage Calculator
Track shoe mileage and estimate when to replace your running shoes.
Shoe Size Calculator
Convert running shoe sizes between UK, US and EU systems.
Shoe Rotation Calculator
Plan your shoe rotation schedule to extend shoe life.
Clothing Layer Calculator
Calculate what to wear based on temperature and conditions.
Reflective Gear Calculator
Check if you need reflective gear based on your running time.
Hydration Pack Calculator
Calculate the hydration pack capacity you need for long runs.
GPS Watch Battery Calculator
Estimate GPS watch battery life for your planned activity.
Running Belt Calculator
Calculate what running belt or vest capacity you need.
Plan safe return to running, recovery timelines and cross-training alternatives.
Return to Running Calculator
Plan a safe return-to-running schedule after time off or injury.
Recovery Time Calculator
Estimate recovery time needed between hard sessions.
Step Down Calculator
Calculate step-down weeks for safe mileage progression.
Cross Training Calculator
Calculate equivalent cross-training effort for running fitness.
Rest Day Calculator
Calculate optimal rest day frequency based on training load.
Ice Bath Calculator
Calculate optimal ice bath temperature and duration for recovery.
Compression Calculator
Calculate when to use compression garments for recovery.
Foam Rolling Calculator
Calculate foam rolling time per muscle group for recovery.
Foam Rolling Routine Calculator
Calculate foam rolling routine duration based on target muscle groups and tightness.
Plan race day strategy, taper schedules, goal times and logistics.
Race Day Calculator
Plan your race day schedule with wake-up, warm-up and start times.
Taper Calculator
Calculate your pre-race taper schedule and mileage reduction.
Peak Week Calculator
Plan your peak training week before the taper period.
Goal Time Calculator
Set a realistic race goal time based on training data.
Corral Calculator
Estimate your race corral placement based on predicted time.
Aid Station Calculator
Calculate when you will reach each aid station during your race.
Cutoff Time Calculator
Check if your pace meets race cutoff time requirements.
Race Weight Calculator
Estimate the time impact of race weight changes.
Travel Calculator
Plan race travel logistics with arrival and departure timing.
Bib Number Calculator
Look up bib number ranges for your estimated corral or wave.
Race Fuelling Calculator
Calculate calories, carbohydrate grams, gel count, water volume and electrolyte tablets for races from 5K to ultra marathon based on distance, target time, body weight and intensity.
Calculate lap times, lane staggers, wind corrections and track conversions.
Lap Time Calculator
Calculate target lap times for any track distance and goal time.
Split Time Calculator
Generate split times for track races with even or variable pacing.
Lane Stagger Calculator
Calculate stagger distances for each lane on a standard track.
Wind Correction Calculator
Adjust sprint times for wind speed to get true performance.
Relay Changeover Calculator
Calculate relay changeover zone timing and positioning.
Hurdle Spacing Calculator
Calculate hurdle placement and stride patterns for track events.
Photo Finish Calculator
Calculate time differences from photo finish pixel positions.
Track Conversion Calculator
Convert times between indoor and outdoor track distances.
Calculate cadence, stride frequency, ground contact time and running economy.
Steps to Distance Calculator
Convert step count to distance based on your stride length.
Cadence Calculator
Calculate your running cadence in steps per minute.
Stride Frequency Calculator
Calculate stride frequency and its relationship to speed.
Ground Contact Calculator
Estimate ground contact time from pace and cadence data.
Vertical Oscillation Calculator
Calculate vertical oscillation and its efficiency impact.
Running Economy Calculator
Estimate your running economy from VO2 and pace data.
Power Calculator
Estimate running power output in watts from pace and weight.
Efficiency Calculator
Calculate your overall running efficiency score.
Elevation-Adjusted Pace Calculator
Calculate flat-equivalent pace from hilly run data using total ascent and descent.
Running shoe rotation, replacement schedules and gear management calculators.
Lactate threshold, VO2max estimation and physiological benchmarks from race results.
Useful running reference guides, conversion charts and race data.
Heart Rate Training Zones
Heart rate zones 1-5 defined by % of max HR and heart rate reserve with perceived effort and typical activities.
Pace & Speed Conversion Chart
Convert running pace between min/km, min/mile, km/h and mph from 3:00/km to 8:00/km.
Race Distances Reference
Standard race distances in km and miles from 5K to ultra marathon with world records and amateur target times.
Running Shoe Size Chart
Running shoe size conversions between UK, EU, US sizes with foot length in cm.
Why Use RunCalcs?
Every calculator on this page is completely free, requires no signup, and works on any device. Get accurate results instantly with clear breakdowns you can trust.
RunCalcs gives you 115+ specialist calculators across 13 categories. Results include detailed breakdowns and let you input your own prices for cost estimates tailored to your needs.