# Free Training Tools - Trainingload.ai Last updated: 2026-05-23 Trainingload.ai provides free endurance training calculators and file converters for runners, cyclists, triathletes, coaches, and self-coached athletes. These tools support training load management, threshold estimation, zones, race-performance interpretation, and activity-file handling. Tools hub: https://www.trainingload.ai/tools Related product context: https://www.trainingload.ai/training-load Training glossary: https://www.trainingload.ai/docs/metrics ## Tools ### FTP Calculator Upload GPX, FIT, or TCX activity files to estimate FTP, Critical Power, W', and running W/kg reference. Primary URL: https://www.trainingload.ai/ftp-calculator Localized URLs: - en: https://www.trainingload.ai/ftp-calculator - ja: https://www.trainingload.ai/ja/ftp-calculator - zh: https://www.trainingload.ai/zh/ftp-calculator - zh-hant: https://www.trainingload.ai/zh-hant/ftp-calculator ### Critical Power Calculator Enter max mean power points to estimate Critical Power, W', Pmax, and eFTP. Primary URL: https://www.trainingload.ai/critical-power-calculator Localized URLs: - en: https://www.trainingload.ai/critical-power-calculator - ja: https://www.trainingload.ai/ja/critical-power-calculator - zh: https://www.trainingload.ai/zh/critical-power-calculator - zh-hant: https://www.trainingload.ai/zh-hant/critical-power-calculator ### Lactate Threshold Calculator Estimate LTHR, FTP, and threshold pace from practical field-test data. Primary URL: https://www.trainingload.ai/lactate-threshold-calculator Localized URLs: - en: https://www.trainingload.ai/lactate-threshold-calculator - ja: https://www.trainingload.ai/ja/lactate-threshold-calculator - zh: https://www.trainingload.ai/zh/lactate-threshold-calculator - zh-hant: https://www.trainingload.ai/zh-hant/lactate-threshold-calculator ### VDOT Calculator Estimate VDOT from race performance and generate equivalent performances and training paces. Primary URL: https://www.trainingload.ai/vdot-calculator Localized URLs: - en: https://www.trainingload.ai/vdot-calculator - ja: https://www.trainingload.ai/ja/vdot-calculator - zh: https://www.trainingload.ai/zh/vdot-calculator - zh-hant: https://www.trainingload.ai/zh-hant/vdot-calculator ### VO2 Max Calculator Estimate VO2 max from distance, time, pace, resting heart rate, or fitness data. Primary URL: https://www.trainingload.ai/vo2-max-calculator Localized URLs: - en: https://www.trainingload.ai/vo2-max-calculator - ja: https://www.trainingload.ai/ja/vo2-max-calculator - zh: https://www.trainingload.ai/zh/vo2-max-calculator - zh-hant: https://www.trainingload.ai/zh-hant/vo2-max-calculator ### Power Zones Calculator Generate cycling or running power zones from FTP, CP, or threshold power. Primary URL: https://www.trainingload.ai/power-zones-calculator Localized URLs: - en: https://www.trainingload.ai/power-zones-calculator - ja: https://www.trainingload.ai/ja/power-zones-calculator - zh: https://www.trainingload.ai/zh/power-zones-calculator - zh-hant: https://www.trainingload.ai/zh-hant/power-zones-calculator ### Heart Rate Zones Calculator Calculate heart-rate training zones using HRR, LTHR, or max-heart-rate methods. Primary URL: https://www.trainingload.ai/heart-rate-zones-calculator Localized URLs: - en: https://www.trainingload.ai/heart-rate-zones-calculator - ja: https://www.trainingload.ai/ja/heart-rate-zones-calculator - zh: https://www.trainingload.ai/zh/heart-rate-zones-calculator - zh-hant: https://www.trainingload.ai/zh-hant/heart-rate-zones-calculator ### Max Heart Rate Calculator Compare common HRmax formulas and generate practical training heart-rate zones. Primary URL: https://www.trainingload.ai/max-heart-rate-calculator Localized URLs: - en: https://www.trainingload.ai/max-heart-rate-calculator - ja: https://www.trainingload.ai/ja/max-heart-rate-calculator - zh: https://www.trainingload.ai/zh/max-heart-rate-calculator - zh-hant: https://www.trainingload.ai/zh-hant/max-heart-rate-calculator ### Activity File Converter Browse all free GPX, FIT, and TCX activity-file converters. Primary URL: https://www.trainingload.ai/converter Localized URLs: - en: https://www.trainingload.ai/converter - ja: https://www.trainingload.ai/ja/converter - zh: https://www.trainingload.ai/zh/converter - zh-hant: https://www.trainingload.ai/zh-hant/converter ### FIT to GPX Converter Convert Garmin FIT activity files into map-friendly GPX files. Primary URL: https://www.trainingload.ai/fit-to-gpx Localized URLs: - en: https://www.trainingload.ai/fit-to-gpx - ja: https://www.trainingload.ai/ja/fit-to-gpx - zh: https://www.trainingload.ai/zh/fit-to-gpx - zh-hant: https://www.trainingload.ai/zh-hant/fit-to-gpx ### GPX to FIT Converter Convert GPX activity or route files into FIT files for compatible sports workflows. Primary URL: https://www.trainingload.ai/gpx-to-fit Localized URLs: - en: https://www.trainingload.ai/gpx-to-fit - ja: https://www.trainingload.ai/ja/gpx-to-fit - zh: https://www.trainingload.ai/zh/gpx-to-fit - zh-hant: https://www.trainingload.ai/zh-hant/gpx-to-fit ### TCX to GPX Converter Convert TCX training exports into GPX tracks for mapping and sharing. Primary URL: https://www.trainingload.ai/tcx-to-gpx Localized URLs: - en: https://www.trainingload.ai/tcx-to-gpx - ja: https://www.trainingload.ai/ja/tcx-to-gpx - zh: https://www.trainingload.ai/zh/tcx-to-gpx - zh-hant: https://www.trainingload.ai/zh-hant/tcx-to-gpx ### GPX to TCX Converter Convert GPX files into Garmin Training Center XML TCX files. Primary URL: https://www.trainingload.ai/gpx-to-tcx Localized URLs: - en: https://www.trainingload.ai/gpx-to-tcx - ja: https://www.trainingload.ai/ja/gpx-to-tcx - zh: https://www.trainingload.ai/zh/gpx-to-tcx - zh-hant: https://www.trainingload.ai/zh-hant/gpx-to-tcx ### FIT to TCX Converter Convert FIT activity files into readable TCX XML activity files. Primary URL: https://www.trainingload.ai/fit-to-tcx Localized URLs: - en: https://www.trainingload.ai/fit-to-tcx - ja: https://www.trainingload.ai/ja/fit-to-tcx - zh: https://www.trainingload.ai/zh/fit-to-tcx - zh-hant: https://www.trainingload.ai/zh-hant/fit-to-tcx ### TCX to FIT Converter Convert TCX activity files into FIT files for compatible training workflows. Primary URL: https://www.trainingload.ai/tcx-to-fit Localized URLs: - en: https://www.trainingload.ai/tcx-to-fit - ja: https://www.trainingload.ai/ja/tcx-to-fit - zh: https://www.trainingload.ai/zh/tcx-to-fit - zh-hant: https://www.trainingload.ai/zh-hant/tcx-to-fit ### FIT Course Converter Convert GPX or TCX route/course files into Garmin-compatible FIT course files. Primary URL: https://www.trainingload.ai/fit-course-converter Localized URLs: - en: https://www.trainingload.ai/fit-course-converter - ja: https://www.trainingload.ai/ja/fit-course-converter - zh: https://www.trainingload.ai/zh/fit-course-converter - zh-hant: https://www.trainingload.ai/zh-hant/fit-course-converter ## How these tools fit Trainingload.ai - Threshold calculators help set FTP, CP, LTHR, VDOT, VO2 max, power zones, and heart-rate zones. - File converters help athletes work with GPX, FIT, and TCX activity data before deeper analysis. - Product pages connect tool outputs back to plans, completed workouts, training load, PMC, zones, and AI coach review. - Glossary pages explain the terms behind the tools: training load, PMC, CTL, ATL, TSB, FTP, CP, LTHR, and VO2 Max.