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TimeMaster Pro

Precision Timing Tools

⚡ Pace Calculator

Pace per Km
--:--
min/km
Pace per Mile
--:--
min/mi
Speed
--
km/h
400m Split
--:--
per lap
🏃
Start 25% 50% 75% Finish

Pace Comparison

Your Pace
--:--
Beginner
6:00/km
Intermediate
5:00/km
Advanced
4:00/km

❓ Frequently Asked Questions

How accurate is the race time predictor?
Our race time predictor uses scientifically-validated formulas like the Riegel formula and Cameron formula, which are accurate within 3-5% for most runners. Accuracy depends on your training specificity - predictions work best when comparing similar race distances (e.g., 10K to Half Marathon) and assume proper training for the target distance.
What is a good running pace for beginners?
For beginners, a good running pace is typically 10-12 minutes per mile (6:15-7:30 min/km). This conversational pace allows you to build endurance without overexertion. Focus on time on feet rather than speed initially. As fitness improves, paces naturally become faster.
How do I calculate my race splits?
Enter your target finish time and race distance in our Split Calculator. It automatically calculates even pacing splits for each kilometer or mile. For negative splits (running second half faster), use our Advanced Mode which lets you set differential pacing strategies.
Can I compare my time with world records?
Yes! Our World Record Comparison feature shows how your time compares to current world records and age-group records. It calculates your percentage behind the record and provides age-graded scores to compare performances across different ages and genders fairly.
What are training zones and how do I calculate them?
Training zones are intensity ranges based on your threshold pace or heart rate. Our calculator identifies 5 zones: Recovery (very easy), Aerobic (easy pace), Tempo (comfortably hard), Threshold (hard), and Anaerobic (very hard). Enter a recent race time to automatically calculate your personalized zones.

🎯 Complete Running Calculator for Serious Runners

TimeMaster Pro Race Time Calculator is the ultimate tool for runners, coaches, and athletes. Whether you're training for your first 5K or aiming for a Boston Marathon qualifying time, our suite of calculators provides precise data to optimize your training and racing strategy.

⚡ Pace Calculator

Calculate your exact running pace for any distance and time combination. Get instant conversions between min/km and min/mile, speed in km/h or mph, and track-specific 400m lap splits. Perfect for track workouts and race planning.

🔮 Race Predictor

Using scientifically-validated algorithms, predict your finish time for any race distance based on a recent performance. Our calculator uses the Riegel formula (T2 = T1 × (D2/D1)^1.06) adjusted for real-world racing conditions.

⏱️ Split Planner

Create detailed kilometer-by-kilometer or mile-by-mile split charts for your next race. Choose from even pacing, negative splits (fast finish), or positive splits strategies. Export your splits to your watch or print them for race day.

💓 Training Zones

Calculate personalized heart rate and pace zones based on your threshold. Train smarter with scientifically-backed zones: Recovery, Aerobic, Tempo, Threshold, and Anaerobic. Compatible with Garmin, Polar, and other GPS watches.

🏆 World Records

Compare your personal bests against world records, national records, and age-graded standards. See exactly how many percentage points you are behind Eliud Kipchoge or Sifan Hassan!

Trusted by: Marathon runners, triathletes, track athletes, running coaches, and fitness enthusiasts worldwide. Completely free, no registration required, and works offline once loaded.