About Run Studio
Free running tools. No ads. No BS.
Most running tools today force you to create an account, watch ads, or hand over your email just to calculate a simple pace. We built the tool we wanted to use: clean, fast, and honest.
✓ Always Free
All calculators accessible. No paywalls or premium tiers.
✓ No Ads
Ever. We don't believe in ad-supported running tools.
✓ No Account Needed
Instant access to everything, no signup required.
✓ Privacy-First
Calculator data stays on your device. Cookie-free analytics.
✓ Mobile-Optimized
Works perfectly on your phone at track or gym.
✓ Lightning Fast
Instant calculations with no page loads or waiting.
- ✓Pace/Time/Distance Calculator - Convert between pace, time, and distance instantly
- ✓VDOT & VO2max - Jack Daniels' formula with improved VO2max accuracy using ability-based running economy
- ✓Smart Training Pace Ranges - Unlike most calculators that only provide ranges for Easy pace, we provide ranges for ALL training zones. Your threshold isn't a rigid 6:45/mi—it's a zone that adapts to real conditions like fatigue, weather, and how you feel, while still delivering the right training stimulus.
- ✓CV & VO2max Training Paces - Research-backed Critical Velocity and VO2max paces for precise interval training
- ✓Grade Adjusted Pace (GAP) - Hill running adjustments to show flat-ground equivalent effort for uphill and downhill training
- ✓Age Grading - World Masters Athletics (WMA) age-graded performance comparison accounting for age and gender, with percentiles, performance categories, and equivalent times for fair comparisons
- ✓Boston Qualifier Analysis - Data-driven BQ predictions with historical acceptance probability based on 6 years of actual BAA cutoff data, personalized to your age group and gender
- ✓Race Time Predictor - Predict performance across different distances
- ✓Heart Rate Zones - Calculate training zones using multiple methods
- ✓Treadmill Incline Calculator - Set treadmill incline to match outdoor effort, or find equivalent outdoor pace for your treadmill workouts
- ✓Bidirectional Altitude Adjustment - Train at altitude, race at sea level? Or vice versa? We adjust both ways for accurate paces
- ✓Heat & Humidity Adjustment - Dew point-based heat stress adjustments to account for temperature and humidity impact on performance, helping you set realistic paces for hot weather training and racing
- ✓Cadence & Stride Length Calculator - Enter your cadence (steps per minute) or stride length to see the complementary metric for each training pace
- ✓Mobile-First Design - Perfect for planning workouts on the go, at the track, or in the gym
- ✓One-Click Copy - Instantly copy all results to share with coaches, paste in training logs, or save to notes
- ✓Data Persistence - Your inputs save automatically. No account needed.
- ✓Smart Pacing Strategies - Generate splits with even pace or customizable negative split percentages for optimal race execution
- ✓Printable Pace Bands - Generate print-ready pace bands with your splits to tape to your forearm on race day. Supports even and negative split strategies.
- ✓Shareable Results - Generate a shareable link for your VDOT calculations to share with coaches, training partners, or on social media
- ✓Runner Profiles - Create your profile to save PRs, track your VDOT progression, and share your achievements with a public profile link
- ✓Community Leaderboard - Compare your VDOT and performances with other runners. Filter by age group, gender, and location to see where you stand
- ✓USMC PFT/CFT Calculator - Score your Physical Fitness Test and Combat Fitness Test with altitude adjustments, 5K row option, and personalized improvement recommendations
- ✓Desktop Studio Mode - On larger screens, collapsible side panels give you quick access to your training paces, HR zones, and calculator history while you work
- ✓Calculator History - Save calculations to your history and restore any previous result with one click to pick up where you left off
- ✓Training Notes - Keep personal notes alongside your training data. Jot down race strategies, workout reflections, or coaching feedback
Install Run Studio on your device for instant access from your home screen. No app store required!
📱 iOS (iPhone/iPad)
- Open run.introversion.ai in Safari
- Tap the Share button at the bottom
- Scroll down and tap "Add to Home Screen"
- Tap "Add" - the app will appear on your home screen
🍎 Mac (macOS Sonoma+)
- Open run.introversion.ai in Safari
- Click File → Add to Dock in the menu bar
- Name the app and customize the icon (optional)
- Click "Add" - the app appears in your Dock and Applications
🤖 Android
- Open run.introversion.ai in Chrome
- Look for the "Install" button in the header
- Or tap the menu (⋮) and select "Install app"
- Tap "Install" - the app will appear on your home screen
💻 Desktop (Chrome/Edge)
- Open run.introversion.ai in Chrome or Edge
- Click the "Install" button in the header
- Or click the install icon in your browser's address bar
- Click "Install" - the app will launch like a native application
Once installed, Run Studio loads instantly from your home screen like a native app.
Run Studio is created by Introversion AI, a team passionate about building accessible tools for athletes. We're runners ourselves and understand the frustration of cluttered, ad-filled calculators—this tool is our contribution to the running community.
Core promise: All running calculators will always be free—no ads, no paywalls. We're exploring optional premium features like AI-powered coaching based on community feedback. If we build them, they'll help fund keeping these tools free forever.
Our calculators are based on proven running science and peer-reviewed exercise physiology research. All formulas and methodologies are cited with scientific sources.
Run Studio is actively being improved based on feedback from the running community. If something is confusing, if you'd like different tools, or if the calculations don't match your training needs, we want to hear about it.