How fast should you run to finish a marathon in 3 hours? Or 10 km in 45 minutes? What is your total time if your pace is 4 minutes and 35 seconds per kilometer? With a very simple interface you can:- Enter distance and pace to calculate total time- Enter distance and total time to calculate paceThis is the perfect companion to RunKeeper, Runmeter, Runtastic, MapMyRun or any other GPS enabled app that measures your pace. Preset distances for marathon and half marathon or custom distances in kilometers or miles.