Time Trial Pace Calculator Formula
Understand the math behind the time trial pace calculator. Each variable explained with a worked example.
Formulas Used
Average Speed
avg_speed = round(speed_mph * 100) / 100Average Speed
avg_speed_kph = round(speed_mph * 1.60934 * 100) / 1005-Mile Split
split_5mi = round(5 / speed_mph * 60 * 10) / 1010-Mile Split
split_10mi = round(10 / speed_mph * 60 * 10) / 10Variables
| Variable | Description | Default |
|---|---|---|
distance_miles | TT Distance(miles) | 25 |
target_minutes | Target Time(min) | 60 |
speed_mph | Derived value= distance_miles / (target_minutes / 60) | calculated |
How It Works
How Time Trial Pacing Works
Formula
Speed = Distance / Time
Split Time = Split Distance / Speed
Time Trial Strategy
The key to a fast time trial is even pacing. Start at your target speed and hold it steady. Going too hard in the first half leads to a disproportionate slowdown in the second half.
Worked Example
A 25-mile cycling time trial with a 60-minute target.
- 01Speed = 25 / (60/60) = 25.00 mph
- 02Speed in km/h = 25 * 1.609 = 40.23 km/h
- 035-mile split = 5 / 25 * 60 = 12.0 min
- 0410-mile split = 10 / 25 * 60 = 24.0 min
Frequently Asked Questions
What is a good 25-mile time trial time?
For competitive cyclists: under 55 minutes is strong, under 50 minutes is excellent, and under 45 minutes is elite.
Should I pace evenly in a time trial?
Yes. Research shows even pacing or slight negative splits produce the fastest times.
How does wind affect time trial strategy?
On an out-and-back course, push slightly harder into the headwind and ease off with the tailwind. The net effect of equal headwind and tailwind is always negative.
Ready to run the numbers?
Open Time Trial Pace Calculator