Marathon time calculates your estimated finish time for a full marathon in real-time. This is a great tool when striving for a new personal goal. Include this App in your running mode and use it pace yourself to reach your goal.
Suunto Ambit Collection, Suunto Movescount App
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This race time predictor is very slow to react. Perhaps good for a course on rolling hills, as it's based on average pace for the total race, rather than what you're currently running. I've created a more responsive one, based on your current average pace over the most recent 30 seconds. http://www.movescount.com/apps/app10054536-Half_Marathon_Race_Predictor_30s_Avg
If it's only calculating with your Avg speed it's not really that interesting. Maybe people would be more interested in knowing what the minimum speed for the rest of the race needs to be to reach their goal. For example: your goal is 3h and you still need to run 10k and you're already running 2h15; so you need to run the rest in 4'30"/km or faster.
Everything every runner always wanted to have:
1) Four estimates (5k, 10k, Half, Full Marathon) in a singe APP: http://www.movescount.com/apps/app10012615-MarathonhalfM10k5k_time_estimator_in1
2) Riedel's formula: http://www.movescount.com/apps/app10016363-Marathon_Time_Estimates_Riedel_and_Speed
3) Cooper Test: http://www.movescount.com/apps/app10013191-Cooper_Test_estimate_HR_time_left
4) Cardiac Drift: http://www.movescount.com/apps/app10012137-4in1_Interval_Training_Cardiac_Drift_oth
I don't like this app - the estimate is based on the AVG_SPD for the whole distance covered so far. It is rather difficult (and not recommended) to keep a steady speed during the whole marathon (see, e.g.: http://www.runnersworld.com/race-training/marathon-pace-perfect) and usually you will run the 1st half a bit faster than the 2nd one. That means that the app by Movescount will be showing you too optimistic results.
As a prep for marathon try interval training with this APP: http://www.movescount.com/apps/app10012137-4in1_Interval_Training_Cardiac_Drift_oth - it's a multi-APP - you have Cardiac Drift (comparison of performance, i.e. the ratio SPEED/HR between intervals), Karvonen HR%, max HR, max Speed in one app. And also timers for interval and rest periods.
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