Scenario inputs

Source clock at the selected distance. Example: 16:00. No seconds rollover or unit suffix.

Estimated XC time

Enter a time

Enter complete positive seconds, M:SS.xx or H:MM:SS.xx. Seconds must be below 60.

Course factors are assumptions, not measured terrain costs or official qualifying conversions.

Separate distance from terrain

Equal distances use no Riegel distance change. Track → XC adjusts the distance first, then multiplies by the course factor. XC → track removes the factor at the source distance, then adjusts distance. Unrounded seconds drive the calculation; clocks round for display.

The Fast / firm / flat choice still applies ×1.03: it is not a flat-to-flat identity setting. For a distance-only comparison, use the Riegel race-time predictor. Footing, weather, measurement and individual preparation can overwhelm these assumed percentages; no course-normalized ranking, record or athlete-specific guarantee follows from them.