Step 1: Tell the calculator "What You Are Trying To Find"
Step 2: Enter the two other variables (Time, Distance, Pace) into the appropriate fields.
Step 3: Select your units, and the pace calculator will give you the third variable.

What Are You Trying To Find?  

Time(hours:minutes:seconds)

Distance

Pace (hours:minutes:seconds)

: : : :
  Miles
Meters
Yards
Kilometers
Mile
400m
Kilometer