Running Tools & Calculators

46 free, science-based calculators covering pace, training plans, nutrition, heart rate zones, and more. No sign-up required.

46

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5

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Performance

Pace Calculator

Convert between pace, speed, and time

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Performance

Race Time Predictor

Estimate race times based on recent performances

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Performance

GAP Calculator

Grade Adjusted Pace for hilly terrain

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Performance

Age-Grade Calculator

Performance comparison across age groups

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Performance

Pace Converter

Convert between different pace formats

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Performance

Split Time Calculator

Calculate split times for races

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Performance

Negative Split Calculator

Calculate negative split pacing strategy

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Performance

Weight vs Pace Calculator

Calculate how weight affects running pace

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Performance

Altitude Adjustment Calculator

Adjust pace for altitude effects

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Performance

Treadmill Incline Effort Calculator

Calculate equivalent outdoor effort on treadmill

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Performance

Wind Adjusted Pace Calculator

Calculate pace adjustments for headwinds and tailwinds

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Performance

Heat Adjusted Pace Calculator

Calculate pace adjustments for hot weather conditions

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Health & Body

BMI Calculator

Body mass index calculations with health categories

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Health & Body

Body Fat Calculator

Multiple methods for accurate body composition analysis

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Health & Body

Protein Intake Calculator

Calculate daily protein needs for fitness goals

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Health & Body

Fat Intake Calculator

Calculate optimal fat consumption for performance

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Health & Body

Carbohydrate Calculator

Calculate carb needs for training and racing

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Health & Body

Macro Calculator

Calculate macronutrient ratios for goals

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Health & Body

TDEE Calculator

Calculate Total Daily Energy Expenditure

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Health & Body

Running Calories Calculator

Calculate calories burned during running

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Health & Body

Body Surface Area Calculator

Calculate body surface area for medical purposes

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Health & Body

GFR Calculator

Calculate Glomerular Filtration Rate

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Training

Running Plan Generator

Customized training plans based on goals and race dates

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Training

Interval Generator

Create structured interval workouts for speed and endurance

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Training

Interval Designer

Design custom interval workouts

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Training

Training Paces Calculator

Determine optimal training paces for different workout types

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Training

Training Paces

Calculate training pace zones

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Training

Target Heart Rate Calculator

Calculate optimal training zones using multiple methods

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Training

Training Load Estimator

Estimate training load and recovery needs

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Training

Pace-HR Zone Translator

Translate between pace and heart rate zones

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Training

Run-Walk Calculator

Calculate run-walk intervals for training

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Training

Couch to 5K Generator

Structured beginner running programs

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Training

HYROX Workout Generator

Functional fitness and obstacle course training plans

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Training

Push-Pull Workout Generator

Generate push-pull strength training plans

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Training

Running Form Assessment

Assess and improve running form

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Training

Cadence Converter

Convert between cadence measurements

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Training

Pace Band Generator

Generate printable pace bands for races

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Training

Distance Converter

Convert between different distance units

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Training

Deck Workout Generator

Draw cards to generate random running workouts

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Training

Dice Workout Generator

Roll dice to generate random running workouts

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Challenges

100 Pushups Challenge

Progressive pushup training program

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Challenges

100 Pullups Challenge

Pullup strength building program

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Challenges

500 Squats Challenge

Lower body strength and endurance

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Challenges

2000 Jump Rope Challenge

Cardiovascular fitness and coordination

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Challenges

300 Situps Challenge

Core strength and endurance program

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Challenges

150 Bar Dips Challenge

Upper body strength and endurance

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Specialized

Race Day Weather

Weather impact on race performance

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Specialized

Red January

Red January running challenge tracker

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Frequently asked questions

Are the RunReps tools free to use?

Yes. All 46 tools on RunReps are free with no sign-up required. Use them on any device, as many times as you like.

How accurate are the running calculators?

RunReps calculators use established sports science formulas - the same methods used by coaches and exercise physiologists. Results are estimates; individual factors like fitness, terrain, and conditions always affect real-world performance.

Do the tools work on mobile?

Yes. Every tool is fully responsive and works on phones, tablets, and desktops.

Which tool should I start with?

If you are training for a race, start with the Running Plan Generator to build your schedule, then use the Training Paces Calculator to set your workout zones. If you just want to check a number, the Pace Calculator is the most commonly used tool on the site.