Free tools
Training tools that just work
No signups, no ads — the calculators and charts we wish every runner and lifter had bookmarked. Built by the team behind Reysa.
Running pace calculator
Distance, time, or pace — enter two, get the third, with full splits.
Open →Marathon pace calculator
Goal time in, required pace and every split out.
Open →Half marathon pace calculator
The pace your goal half demands, km and miles.
Open →Running pace chart
Every pace from 3:00 to 8:00 /km with 5K–marathon finish times.
Open →Marathon pace chart
Finish times 2:30–6:30 with paces and splits for each.
Open →Half marathon pace chart
Finish times 1:10–3:30 with paces and splits for each.
Open →One-rep max calculator
Estimate your 1RM from any set — four formulas, training percentages.
Open →Stop calculating, start tracking
Reysa logs your runs and lifts — pace, splits, and progress, automatically.