Run smarter. Train better.
Calculate your running pace, plan race times, understand your performance, and build better training habits with simple, free tools.
Search our six calculators and their tutorials. Looking for training articles? Find Articles →
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Running Calculators
Six practical tools to calculate, plan, and better understand your running.
Running Pace Calculator
Calculate your pace and average speed using your running distance and finishing time.
Open CalculatorRace Time Predictor
Estimate a possible finish time for a 5K, 10K, half marathon, or marathon.
Open CalculatorRunning Split Calculator
Create target split times and cumulative times for a planned race finish.
Open CalculatorRun/Walk Calculator
Plan alternating running and walking intervals for a timed workout.
Open CalculatorRunning Cadence Calculator
Calculate steps per minute and estimate average step length from your pace.
Open CalculatorTreadmill Pace Converter
Convert treadmill speed between km/h, mph, and running pace.
Open CalculatorHow to Use Our Calculators
Detailed tutorials for each tool, with formulas, examples, practical instructions, and FAQs.
How to Use the Pace Calculator
Learn how to enter distance and time, read your pace, convert speed, and understand your results.
Read TutorialHow to Use the Race Time Predictor
Understand race predictions, choose a previous result, compare distances, and interpret estimates.
Read TutorialHow to Use the Split Calculator
Create race splits step by step, understand cumulative times, and plan a consistent pace.
Read TutorialHow to Use the Run/Walk Calculator
Choose run and walk intervals, build a workout schedule, and understand your time totals.
Read TutorialHow to Use the Cadence Calculator
Measure your step rate, calculate SPM, and learn what cadence measurements tell you.
Read TutorialHow to Use the Treadmill Converter
Convert treadmill speed into pace, compare km/h with mph, and calculate training times.
Read TutorialThese six tutorials explain our tools. Our Guides section is a separate blog with articles about training, race preparation, pacing, and running tips.
Explore the Running Blog →Learn more about running
Explore our separate running blog covering 5K, 10K, half marathon, and marathon topics.
Find Articles →Questions? We've got answers.
Helpful answers about our calculators, tutorials, and running resources.
Are CalcStudio running calculators free?
Yes. CalcStudio's running calculators are designed to be free to use without a paid subscription.
Which calculator should I use first?
Start with the Running Pace Calculator if you know your distance and time. Use the Race Time Predictor for estimated future race results, or the Split Calculator to plan a target finishing time.
How accurate are race time predictions?
Race predictions are estimates based on mathematical models and your previous performance. Your actual result can vary with fitness, training, terrain, weather, pacing, and race conditions.
Do I need an account to use the tools?
No account is required to use CalcStudio's running calculators. Our planned Sessions and Planner tools will also be designed for direct use in your browser.
What is the difference between tool tutorials and Guides?
Tool tutorials are detailed instructions for using each CalcStudio calculator. Guides is our separate running blog, covering topics such as 5K training, 10K preparation, half marathons, marathons, and running strategies.
Can beginners use CalcStudio?
Yes. The tools and tutorials are designed to be understandable for runners with different experience levels. Training examples should be adapted to your individual ability, and they are not a substitute for personalized professional advice.