Science-Backed Running Tools
Built by Runners, for Runners
Calculate pace, VDOT, race predictions, training zones — and chat with AI for personalized advice. Free, no ads, no account required.
See It in Action
Powerful calculators with beautiful, intuitive interfaces.
Know Your Running Fitness
Enter any race result and instantly get your VDOT score — the gold standard for measuring running fitness.
- ✓Jack Daniels' proven formula
- ✓VO₂max estimation
- ✓Age & gender grading
- ✓Share results
Everything You Need to Train Smarter
More than just a pace calculator. Run Studio gives you the tools serious runners need.
Pace / Time / Distance
Convert between pace, time, and distance instantly. Supports miles, kilometers, and custom distances.
VDOT & Race Predictions
Jack Daniels' VDOT formula with race time predictions for 5K through marathon distances.
Age-Graded Performance
See your percentile ranking and performance category based on World Masters Athletics data.
Training Paces & HR Zones
Personalized paces and heart rate zones for Easy through Repetition training. Max HR or Karvonen methods.
AI Running Assistant
Chat with AI for personalized running advice, training recommendations, and answers to your questions.
Treadmill Converter
Convert outdoor pace to treadmill speed with incline adjustments for equivalent effort.
Weather & Altitude
Adjust paces for heat, humidity, and elevation. Know your realistic targets for any conditions.
Splits & Pace Bands
Generate race splits with even or negative split strategies. Print pace bands for race day.
Boston Qualifier
Check your BQ status with historical cutoff analysis and acceptance probability.
Why Run Studio?
Most running tools force you to create an account, watch ads, or hand over your email. We built the tool we wanted to use: clean, fast, and honest.
Always Free
All calculators accessible forever. No paywalls or premium tiers.
No Ads
Ever. We don't believe in ad-supported running tools.
No Account Needed
Instant access to everything. Sign up only for profiles.
Privacy-First
Cookie-free analytics. No data collection or sale.
PWA Ready
Install like an app. Works offline at the track or gym.
Lightning Fast
Instant calculations. No page loads or waiting.
Join the Running Community
Create your runner profile, track your PRs, and see how you stack up against other runners on our community leaderboard. Share your results with training partners or on social media.
Runner Profiles
Create your profile to track PRs, save your VDOT progression, and share achievements.
Community Leaderboard
Compare your VDOT with other runners. Filter by age group and gender to find your ranking.
Shareable Results
Generate shareable cards and links for your calculations. Perfect for social media or forums.
Leaderboard
AI-Powered Training Plans
Smart training plans personalized to your fitness level, goals, and schedule. Join the waitlist to be first in line.
AI-Powered Training Plans
Smart training plans personalized to your fitness level, goals, and schedule.
Garmin & COROS Sync
Connect your watch to automatically import workouts and track progress.
Flexible Pricing
Choose what works for you—one-time purchase or subscription options available.
Get Early Access
Be the first to know when AI training plans launch.
Built on Proven Science
Our calculators use Jack Daniels' VDOT methodology, World Masters Athletics age-grading data, and peer-reviewed exercise physiology research. Every formula is transparent and cited.
Ready to Train Smarter?
Join runners using Run Studio to calculate paces, predict race times, and optimize their training.
Try Run Studio Free