Race Equivalent Time Estimator
Estimate equivalent time and pace for 1–20 target distances using the fixed Riegel exponent 1.06. Fixed Riegel benchmark: exponent 1.06. Independent primary research by Blythe and Király, PLOS ONE (2016), describes this model; individual variation remains. Similar race conditions and fitness are assumed. No individual guarantee. Choose Parkrun / 5 km to set the target list to 5 km. This is an estimate, not a performance guarantee.
A QUICK WALKTHROUGH
How to use this tool
- Enter the required decimal values.
- Enter 1–20 comparison values, separated by commas or new lines.
- Calculate, inspect every row, and copy or download the same report.
Formula
T2=T1(D2/D1)^1.06; p2=60T2/D2
Assumptions
Fixed Riegel benchmark: exponent 1.06. Independent primary research by Blythe and Király, PLOS ONE (2016), describes this model; individual variation remains. Similar race conditions and fitness are assumed. No individual guarantee.
Results
Calculated. Values show full JavaScript numeric precision.
Model
Fixed Riegel benchmark: exponent 1.06. Independent primary research by Blythe and Király, PLOS ONE (2016), describes this model; individual variation remains. Similar race conditions and fitness are assumed. No individual guarantee. https://doi.org/10.1371/journal.pone.0157257
Parkrun / 5 km
Choose Parkrun / 5 km to set the target list to 5 km. This is an estimate, not a performance guarantee.
GOOD TO KNOW
Common questions
How are results calculated?
T2=T1(D2/D1)^1.06; p2=60T2/D2 Fixed Riegel benchmark: exponent 1.06. Independent primary research by Blythe and Király, PLOS ONE (2016), describes this model; individual variation remains. Similar race conditions and fitness are assumed. No individual guarantee.
Are results guaranteed?
No. This is a local planning calculation, not a guarantee of an individual race outcome.