Runner’s Tool Kit · Free calculators and finders
Running Calculators and Tools.
Get the Answer You Need.
Start with one question. Find pace, splits, training zones, a weekly plan, marathon preparation, shoes, a GPS watch, or what to wear without opening every tool.
Four common starting points
- Turn a goal time into pace and splits
- Predict a race from a recent result
- Build training and marathon plans
- Choose shoes, clothing, and a watch
18 free tools · No signup required · Mobile friendly
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View all 18 tools in one list
Pace and race
Training and fitness
Marathon planning
Start here
What do you need help with today?
Choose the question that sounds most like yours. You do not need to use every calculator.
Pace, predictions, and effort
Most useful running calculators
These six tools cover the numbers runners check most often during training and race preparation.
PACE
Goal time to pace
Race pace
Race Pace Calculator
Turn a finish goal into target pace, cumulative splits, and a printable pace wristband.
TIME
Recent result to prediction
Race prediction
Race Time Calculator
Estimate another race distance and compare standard and more conservative predictions.
SPLIT
Kilometres, miles, or custom
Race checkpoints
Running Split Calculator
Build checkpoints for an even, negative, or more conservative race plan.
TREAD
Speed and pace conversion
Indoor running
Treadmill Pace Calculator
Convert treadmill speed to pace, pace to speed, and estimate indoor distance.
HR
Max HR and reserve
Heart rate
Heart Rate Zone Calculator
Compare Max HR and heart rate reserve zones, including a clearer Zone 2 estimate.
ZONES
Easy to interval pace
Training pace
Running Training Zones
Use a recent result to estimate easy, long run, tempo, interval, and race pace ranges.
Training and fitness
Build the plan and check the goal
Use these tools when you need intervals, a fitness estimate, a weekly schedule, or a reality check on a new personal best goal.
WALK
Beginner intervals
Beginner and returner
Run Walk Calculator
Plan running and walking intervals for training, longer runs, or race day.
VO2
Aerobic fitness estimate
Fitness check
VO₂ Max Calculator
Estimate aerobic fitness from a field test or a recent race result.
PLAN
5K to marathon
Weekly schedule
Training Plan Creator
Build a personalised plan around your race date, distance, fitness, and schedule.
PR
PB and goal comparison
New tool
PR and PB Goal Calculator
Compare a recent result with a goal distance, goal time, and optional race date.
Not sure which number to follow during a workout? Read Heart Rate Zones vs Pace Zones before choosing one.
New featured tool
Marathon Countdown and Race Week Planner
Enter your marathon date once. Get a dated checklist for training priorities, travel, pace, fuel, race morning, and packing as the race gets closer.
- Dated countdown tasks
- Race morning timeline
- Pace and fuel snapshot
- Interactive packing list
Race planning
Choose the race, practise the fuel, and review the result
The countdown planner connects the details. These three tools help before and after it.
FUEL
Gels, carbs, and electrolytes
Marathon nutrition
Marathon Fueling Calculator
Turn a carbohydrate target, finish time, and gel choices into a plan to practise.
RACE
Location, month, and course
Choose an event
Marathon Finder
Find a marathon that fits your preferred timing, location, course, and goal.
REVIEW
After a difficult race
Race debrief
Missed Goal Race Debrief
Review goal choice, training, pacing, fueling, conditions, recovery, and execution.
Shoes, watches, and clothing
Match the gear to the runner and the conditions
Use these tools to narrow the options before opening individual buyer guides or reviews.
SHOE
Support, fit, and use
Shoe selection
Running Shoe Finder
Narrow down shoe type by support, cushioning, fit, surface, and training use.
MILES
Track more than one pair
Shoe lifespan
Shoe Mileage Tracker
Save multiple pairs and set an inspection reminder for each shoe.
WEAR
Temperature and conditions
Running clothing
Running Outfit Calculator
Choose layers and accessories for the temperature, wind, rain, run length, and effort.
WATCH
Budget, battery, and goals
GPS watches
Running Watch Finder
Match your training, battery, navigation, music, and budget needs to a watch.
Simple race workflow
Planning a race from a recent result?
Use the tools in this order. Stop as soon as you have the answer you need.
1
Predict a finish
Estimate a realistic target from a recent result.
2
Set the pace
Turn the finish goal into minutes per kilometre or mile.
3
Build the splits
Create the checkpoints you want to see on race day.
4
Build the training
Create a weekly plan around the goal and race date.
Running calculator FAQ
Choosing and using the tools
Which running calculator should I use?
Use Race Pace when you already have a goal time. Use Race Time when you have a recent result and want to predict another distance. Use the Split Calculator when you need exact checkpoints. Use Training Zones when you want workout paces.
What should a beginner use first?
Start with the Run Walk Calculator if you are building running time gradually. The Treadmill Pace Calculator and Heart Rate Zone Calculator can also help keep early training controlled.
Are running calculators accurate?
They are planning tools, not guarantees. Good inputs matter, and predictions can still be affected by fitness, heat, hills, wind, fatigue, fueling, and the course.
What should I use for a 5K?
Use Run Walk if you are new, Race Pace if you have a goal time, Race Time if you have a recent result, and the Split Calculator for kilometre or mile checkpoints.
What is the difference between the PR Goal Calculator and Race Time Calculator?
The PR Goal Calculator compares an equivalent performance with a specific goal and optional race date. The Race Time Calculator gives a more detailed set of predictions for other distances.
Do I need all of these tools?
No. Use the tool that answers your current question. Return when the next training or race decision comes up.