Running Pace and Race Finish Time Calculator
Estimate race finish time, or average pace for a target result on a specified distance.
Welcome to roddornorn
Latest widgets:
Running Splits Calculator: Equal, Negative, Positive Splits
Running splits calculator estimates your finish time or required pace for a target result in a race, and provides a flexible break down into manageable splits. The tool will make planning a pacing strategy for a race much easier.
Latest news:
TCS London Marathon (April 26, 2026) - a brief results overview
London Marathon 2026 became the race that combined an incredible amount of achievements in a single day.
Running races in Europe in March 2026: A brief results overview
March 2026 was tightly packed with awesome races. Here's a short hand-picked list of half-marathon and marathon events in Europe.
Latest blog posts:
Dual Axis Plot Tool - Cut-off values
In the earlier blog post we continued sharing more details on a browser-based Dual Axis Plot widget, which allows to plot metrics like speed, heart rate or cadence simultaneously over the route sections. In this post we'll provide a bit more details on how to use cut-off values.
Dual Axis Plot Tool - Basic plot controls
In the previous blog post we introduced a small browser-based Dual Axis Plot widget, which allows to overlay two metrics at once, smooth noisy readouts, and apply basic data preprocessing techniques to the specified metrics (speed, heart rate, cadence, etc) over the route sections. In this post we'll provide a bit more details on how to use plot controls.