Offtrack - PAX Calculator

Calculate PAX and Pro Solo Index times instantly during live SCCA Autocross and Pro Solo events.

PAX Calculator is the essential timing companion for SCCA autocross competitors, designed specifically for real-time use at the track. Whether you're competing in a local autocross or a Pro Solo event, get instant indexed times to see exactly where you stand against competitors across different classes.

REAL-TIME CALCULATIONS • Instant PAX and PSI (Pro Solo Index) calculations as times are posted • Compare your indexed time against competitors in different classes • See what raw time others need in different classes to match your performance • Perfect for live timing scenarios when you need answers fast

COMPETITOR COMPARISON • Track multiple competitors simultaneously • Add names and times to see head-to-head comparisons • Understand exactly how much time you need to gain or can afford to lose • Make strategic decisions between runs based on real data

CLASS ANALYSIS • Compare your performance across all SCCA classes • Discover which classes you'd be competitive in • Plan your next car build with data-driven insights • Explore class equivalency with accurate calculations

BUILT FOR THE TRACK • Clean, distraction-free interface designed for quick glances • Dark mode support for early morning and late evening events • Works perfectly on both iPhone and iPad • No internet connection required - all calculations run locally

ALWAYS UP TO DATE • Current 2026 SCCA PAX and Pro Solo Index values • Covers all SCCA autocross classes • Both street and modified categories included • We didn't forget the ladies index classes, like some other apps

Whether you're a seasoned autocrosser tracking your competition, a newcomer learning how classes compare, or a crew chief managing multiple drivers, PAX Calculator gives you the timing intelligence you need to compete smarter.

PERFECT FOR: • Live timing at autocross events • Pro Solo competitions • Between-run strategy • Post-event analysis • Car class decision making • Understanding competition gaps

No ads. No subscriptions. Just fast, accurate calculations when you need them most.

PAX Calculator is an independent app created for SCCA autocross competitors. Not affiliated with or endorsed by the Sports Car Club of America.