Weekly Mileage Buildup Calculator

How it is calculated

You give your current weekly distance D, the number of weeks n and the weekly increase p in percent. With f = 1 + p/100, next week's distance is D × f and the distance after n weeks is D × fn, because each week grows from the week before (compound growth, not a fixed number of kilometres added). Results are shown to one decimal, labelled km. If the increase is left empty it defaults to 10 %. Current distance must be above zero, and weeks must be a whole number from 1 to 1,000. An increase of −100 % or less shows no result, while a smaller negative figure such as −10 gives a cutback ramp. The tool does not insert cutback weeks by itself, and it labels the result km even if you entered miles.

Common mistakes

• Entering the increase as a fraction, such as 0.1 for 10 %. The field is in percent, so 0.1 means a 0.1 % rise per week and the plan barely moves.
• Expecting a straight-line plan of +3.2 km each week. The increase compounds, so later weeks add more kilometres than the first ones.
• Treating the projected number as a target for every week. A pure 10 % ramp with no cutback weeks is hard to sustain; this tool shows the pure ramp only.
• Typing a fractional number of weeks such as 8.5. Weeks must be whole, so use 8 or 9.
• Starting from your best week ever rather than the mileage you actually run now. The projection is only as realistic as the current figure.