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Calcimator

Heat-Adjusted Pace Calculator

Calculate how heat and humidity affect your running pace. Get an adjusted target pace and heat risk assessment for hot weather running.

Inputs

°F
%
miles

Results

Heat-Adjusted Pace

9:21

Normal Pace8:00
Pace Slowdown16.9%
Slowdown per Mile81 sec
Heat Index89°F
Dew Point71°F
Heat Risk LevelHigh
Normal Finish Time48:00
Adjusted Finish Time56:07
Time Added8.1 min
How to Use This Calculator
  1. Enter your Normal Pace in minutes and seconds per mile.
  2. Set the Temperature in °F and Relative Humidity percentage.
  3. Enter your Planned Distance in miles.
  4. Review the Heat-Adjusted Pace, Slowdown Percent, and adjusted Finish Time.
  5. Check the Heat Risk Level and Dew Point to decide whether to modify your effort.

What each input means

Normal Pace Minutes
Minutes portion of your pace per mile in ideal conditions (50-60°F). This is your cool-weather baseline.
Normal Pace Seconds
Seconds portion of your normal pace per mile.
Temperature
Current or forecasted air temperature in Fahrenheit. Performance starts declining above 55°F.
Relative Humidity
Relative humidity percentage. Higher humidity impairs sweat evaporation, increasing heat stress.
Planned Distance
Distance of your planned run in miles. Longer runs are more affected by heat.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Normal Pace Minutes = 8, Normal Pace Seconds = 0, Temperature = 85, Relative Humidity = 60 = 5 input(s) provided
  2. Calculate Heat-Adjusted Pace
    Heat-Adjusted Pace = formatPace(adjustedPace)
    9:21 = 9:21
  3. Calculate Normal Pace
    Normal Pace = formatPace(basePace)
    8:00 = 8:00
  4. Calculate Pace Slowdown
    Pace Slowdown = sd
    16.9 = 16.9

Engine last updated . Checked against 1 independently-derived test — how we verify calculators.

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