Enter data
Export
Download logs, personal bests, shoes and races in one JSON file.
Import
Maximum file size: 1 MB. Import replaces current lists after confirmation.
Reset
Delete only local BiegajTo data.
Running tool
Data backup and restore
Download a local data backup or restore it from a validated JSON file.
🔒 Data and calculations stay in your browser.
What to do next
Compare another scenario, save a workout or prepare a race pace plan. Do not increase load only because a calculator shows an ambitious result.
Advertisement — outside the tool