About 42Cal
A clearer way to choose your next race.
42Cal is an independent race directory and running toolkit. We help runners discover marathons, half marathons, 10Ks, 5Ks, and ultramarathons around the world, then compare the practical details that affect race-day decisions.
What we publish
Our race pages organize dates, locations, registration status, distances, course and elevation details, entry information, weather context, and participation data when those facts are available. Our free calculators help runners turn a race goal into useful pace, training, fueling, and course-planning decisions.
Independent and runner-first
42Cal is not a race organizer and a listing is not an endorsement. We do not sell race entries. Race details can change, so runners should confirm deadlines, policies, and registration terms on the organizer's official website before making travel or purchase decisions.
How to reach us
Corrections, partnership questions, and general feedback are welcome at info@42cal.com. For details on sourcing and review, read our race data methodology.