Time Trial Pace Calculator Formula

Understand the math behind the time trial pace calculator. Each variable explained with a worked example.

Use the Time Trial Pace Calculator

Formulas Used

Average Speed

avg_speed = round(speed_mph * 100) / 100

Average Speed

avg_speed_kph = round(speed_mph * 1.60934 * 100) / 100

5-Mile Split

split_5mi = round(5 / speed_mph * 60 * 10) / 10

10-Mile Split

split_10mi = round(10 / speed_mph * 60 * 10) / 10

Variables

VariableDescriptionDefault
distance_milesTT Distance(miles)25
target_minutesTarget Time(min)60
speed_mphDerived 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.

distance_miles = 25target_minutes = 60
  1. 01Speed = 25 / (60/60) = 25.00 mph
  2. 02Speed in km/h = 25 * 1.609 = 40.23 km/h
  3. 035-mile split = 5 / 25 * 60 = 12.0 min
  4. 0410-mile split = 10 / 25 * 60 = 24.0 min

Ready to run the numbers?

Open Time Trial Pace Calculator