⚡ Calculate Your Race Times

KNOW YOUR
PACE.

Enter your pace, get finish times for every distance instantly. Built for runners and triathletes.

Your Pace
min
sec
per kmper mile
h
min
sec
km/h
5K
25:00
5 kilometers
10K
50:00
10 kilometers
HALF
1:45:29
Half Marathon
FULL
3:30:59
Full Marathon
Pace / km
5:00 min/km
Pace / mile
8:03 min/mi
Speed
12.0 km/h
Speed
7.5 mph

KILOMETER SPLITS

KMSplit TimeCumulative
KM 525:0025:00
KM 1025:0050:00
KM 1525:001:15:00
KM 2025:001:40:00
KM 2525:002:05:00
KM 3025:002:30:00
KM 3525:002:55:00
KM 4025:003:20:00

🏟️ STADIUM SEGMENTS

100m
30.0s
¼ lap
200m
1:00.0
½ lap
400m
2:00.0
1 lap
800m
4:00.0
2 laps
1000m
5:00.0
2½ laps
If this tool saves you time, buy me a coffee ☕
🎯 Race Time Predictor

PREDICT YOUR
FINISH.

Enter a recent race result and get predicted times for all distances using the Riegel formula.

Your Known Result
h
min
sec
📐

Riegel Formula: T₂ = T₁ × (D₂/D₁)1.06
Developed by Pete Riegel (1977), used by coaches worldwide. The exponent 1.06 accounts for the proportionally greater effort required per km at longer distances.

Predicted Times
DistanceFinish TimeAvg Pacevs Your Pace
1K
1km
4:21
4:21/km
-0:39/km
5K
5km
23:59
4:48/km
-0:12/km
10K
10km
50:00
5:00/km
← your result
Half Marathon
21.1km
1:50:19
5:14/km
+0:14/km
Marathon
42.2km
3:50:01
5:27/km
+0:27/km