PaceBib · Built for iPhone
Your race goal.
On a ruler.
PaceBib brings the Marathon Pace calculator to iPhone. Slide the ruler, roll the digits, or enter an exact finish time. Your pace, splits, and equivalent race times update together.
Marathon · Half marathon · 10K · 5K
Coming soon on the App Store
Try the web calculatorRequires iOS 18 or later. Works offline.
From a goal to a race plan
Take your splits with you
Plan even or negative splits. Share a pace-band image, save it to Photos, or keep it on your lock screen for race day.
Check your Boston margin
Compare your marathon goal with your age-group standard. See your qualifying margin, a historical-model admission estimate, and a more conservative target.
Find the pace behind a speed
Switch between min/km, min/mi, km/h and mph. See finish times at that pace, with an optional treadmill-to-road estimate.
Screenshots show example settings. Boston admission estimates use historical data and cannot guarantee acceptance. PaceBib is independent and is not affiliated with the Boston Athletic Association.
Ready when you are
Native haptics help you feel the ruler move. Dark appearance, system text sizes, VoiceOver controls, and 21 interface languages support the way you use your iPhone. Equivalent race times and training pace ranges help you plan your next session.
Training paces, race equivalents, and treadmill adjustments are estimates for planning. Conditions and individual training affect your results.
Your settings stay local
Calculate offline, with no account, ads, or third-party analytics. Your settings and optional BQ profile are stored locally in the app. Apple device or iCloud backups may include that data.