Running Calculator
Finish Time Matrix
Enter your target pace and get a full matrix of projected finish times, from 1km to 50km, with ±20 second pace variations shown side by side.
Target pace column highlighted · Other columns: ±5, ±10 and ±20 seconds
Pacing questions
How do I read a finish time matrix?
Find the column for your target pace, then read down to your distance. The columns to its left and right are the same distance run 5, 10 or 20 seconds per kilometre (or per mile) faster or slower, so you can see what drifting off target actually costs before you are standing on the start line.
How much does 10 seconds per kilometre cost over a marathon?
About seven minutes. Ten seconds across 42.195 km adds up to 7 minutes 2 seconds. Over a half marathon it is 3 minutes 31 seconds, and over 10 km it is 1 minute 40 seconds. Pace decisions that feel small in the first few kilometres are rarely small by the finish.
Should I aim for even splits?
Even or very slightly negative splits are what most well-executed marathons look like. Starting 10 seconds per kilometre faster than target feels free for the first hour and is usually repaid with interest after 30 km. This matrix is most useful read backwards: choose the finish time you want, then find the pace you have to hold from the first kilometre.
Crenoe
Knowing the pace is the easy part.
Holding it for the whole race is the hard part, and that is built in the twelve weeks before it. Crenoe writes those weeks for you, every session to race day, then adapts them each morning to the load you are actually carrying.
Plan to race day
Daily adaptation
Target pace per session
Start with Strava
Free forever. PRO free for 7 days, no card.