Calculators & tools
The numbers behind a smart marathon: what your current fitness is worth over 26.2, and what it takes to get to Boston. Built on the same data as the rest of the site, with the caveats spelled out.
Race time predictor
Turn a recent 5K, 10K, or half marathon into an equivalent time at every distance — including an honest marathon range, not just the optimistic number.
Boston qualifier calculator
Your exact 2026 BQ standard by age and gender, the pace it demands, and whether your time survives the real acceptance cutoff — not just the published table.
Tools that feed into race choice
A prediction or a BQ standard is only half the answer — the other half is where you run it. Every result here links into the rest of the site: the flattest courses, the full Boston qualifying tables, and course-adjusted pacing plans for every race we cover.