Generic browser based speed, distance and time calculators written in javascript by
Nigel Jones for performance oriented cyclists and other racers.

If you can run Windows applications you might prefer a nicer and more compact version of these calculators that ships with my bike gear calculator or the additional functionality of my power calculator.
Better still if your sport does involve bicycles my fixed wheel gear calculator does some very similar calculations in a manner that is more comprehensive because it does take your bicycle gearing and cadence into account but is obviously more complex as a result.

If you can't run windows applications, and/or your sport doesn't involve bicycles so the additional functionality of GearCalc and
PowerCalc isn't of interest to you use these for free.

Time Calculator

Calculates time required to ride a fixed distance in a given average speed. Formula: Time = Distance ÷ Speed

Distance Calculator

Calculates distance covered from average speed and time elapsed. Formula: Distance = Speed × Time