Aaerix
23,000+ runners using this week

Running Calculators that Change Your Stats

Essential calculators and utilities to help you train smarter and run faster.

👉 Calculate My Target Pace📊 Predict My Marathon Time🧭 Build My Race Day Plan
5:20
TARGET PACE /KM
3:42:30
PREDICTED FINISH
152
BPM // Z3 THRESHOLD
1,240
CALORIES BURNED KCAL
Essential · Key Tools

🔥 Key Tools

01

⏱️ Pace Calculator

Calculate the perfect running pace for your target time and distance. Check min/km and mph easily.

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02

🏁 Race Predictor

Predict your half marathon and full marathon times based on your latest 5K or 10K race results.

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03

❤️ HR Zone Calculator

Set effective aerobic and anaerobic training zones using your max and resting heart rate.

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Full Suite · All Tools

🛠 Collection of All Running Tools

⏱️ Target Pace Calculator
🏁 Race Time Predictor
❤️ HR Zone Calculator
🧭 Race Day Planner
🔄 Distance / Speed Converter
🏋️ Treadmill Pace Calculator
🫁 VO2 Max Calculator
🔥 Calorie Burn Calculator
Get Started · Training Plans

🏃 Training Plans

TRAINING PLAN · 01

Couch to 5K

An 8-week entry program that helps you go from walking to finishing 5km.

DURATION
8 weeks
FINISHERS
12,400+
TRAINING PLAN · 02

👟 Bridge to 10K

An upgraded 10km training plan for those who have finished 5km.

DURATION
10 weeks
FINISHERS
6,800+
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Train smarter.

No signup · 100% free · No data stored

👉 Calculate My Target Pace📊 Predict My Marathon Time

Aerix is a free running training platform offering various tools like pace calculators, marathon predictors, heart rate zone calculators, treadmill pace calculators, and distance converters. We help everyone from beginners to marathoners set scientific training plans.