Runner’s Toolkit · Free Calculators

Free tools to
train smarter
and race faster.

Four free calculators that take the guesswork out of training and racing. No more scribbling pace math on your hand mid-run.

Browse Calculators → Where do I start? ↓
100% Free No signup required Coach-approved formulas
The Toolkit

Four calculators. Four answers.

Each tool solves one specific problem. Pick the one that matches what you’re trying to figure out.

Race Pace Calculator

Know exactly what pace you need

Enter your target finish time and distance, and instantly see your required pace per mile or kilometer — plus splits for every mile marker. No more mental math at mile 18.

Perfect For Race day planning · pacing strategy · setting realistic goals
Calculate Your Pace →

Finish Time Predictor

Project your time for any distance

Curious what your half marathon potential is based on that 5K you just crushed? This calculator uses proven equivalency formulas to predict your finish time at any distance.

Perfect For Setting goal times · picking your next race · gauging your fitness
Predict Your Time →

Training Zones Calculator

Every run with a purpose

Your easy run pace and your tempo pace shouldn’t be the same (trust me on this one). Enter a recent race result and get personalized training zones so every run has a purpose.

Perfect For Structuring training weeks · avoiding burnout · building aerobic base
Find Your Zones →

Shoe Mileage Tracker

Know when it’s time for new kicks

Running in worn-out shoes is a fast track to injury. Track your mileage and get a heads-up when your shoes are ready for retirement — typically 300–500 miles depending on the shoe, your weight, and your running surface.

Perfect For Injury prevention · budgeting for new shoes · getting the most from your gear
Track Your Mileage →
Why it matters

Running by feel is great. Data is better.

These calculators aren’t about overcomplicating your training. They’re about giving you confidence.

Confidence on race day

Knowing your goal pace is realistic because you’ve done the math — not because you pulled a number out of thin air the night before the race.

Confidence in training

Understanding why Tuesday’s tempo run is faster than Sunday’s long run — and why running every session at moderate pace is the worst of both worlds.

Confidence in your gear

Replacing shoes before they wreck your knees, not after. The best runners aren’t just fit, they’re informed. These tools help you become both.

Ready for the full package?

Skip the calculators. Get a complete training plan.

These calculators each answer one question. The Training Plan Creator answers all of them at once — it builds a fully periodized plan with pace zones, weekly mileage, and strength sessions included. Same science, zero math.

Build Your Free Plan →
FAQ

Questions about the tools

Are these running calculators accurate?
Yes. The calculators use established formulas trusted by coaches and athletes worldwide — including the Riegel formula for race predictions and standard VDOT-based training zones. That said, every runner is unique. Use these as guidelines, not gospel.
Which calculator should I use first?
Start with the Finish Time Predictor if you have a recent race result. It’ll give you realistic goal times for your next race. Then use the Race Pace Calculator to map out your splits and the Training Zones Calculator to structure your training.
How often should I replace my running shoes?
Most running shoes last 300–500 miles, but this varies based on your weight, running surface, and the shoe itself. The Shoe Mileage Tracker factors these in to give you a personalized estimate.
Do I need a GPS watch to use these tools?
Nope. While a GPS watch helps you track pace during runs, you can use these calculators with just your race times and distances. They’re designed to be simple and accessible. That said, if you’re serious about training, a watch pays for itself in data.
Can I use these for trail running or ultras?
Yes. The calculators work for any distance. Just keep in mind that trail and ultra pacing is more variable due to terrain and elevation — use these numbers as a baseline and adjust for conditions on the day.
Do I need to sign up or pay for anything?
No. Every calculator on this page is free, no signup required. If you want training tips and new tool announcements in your inbox you can subscribe to the newsletter below — totally optional.