The running tools

The Tools section expands the calculator with extra running resources. Here's what each one does. (More tools are planned.)

Heart Rate

Calculates personalized heart-rate training zones , another way to guide workout intensity when heart rate is useful or pace isn't the best measure.

Heat Adjuster

Estimates how heat and humidity can affect running pace, so you can adjust your expectations and effort for challenging conditions.

Altitude Adjuster

Helps account for the effects of elevation when evaluating or planning running performances at different altitudes.

Can You BQ?

Compares your marathon performance or goal against the applicable Boston Marathon qualifying standard. Meeting a standard doesn't necessarily guarantee entry into the race.

Nutrition

Provides estimates for daily calorie and macronutrient needs based on the information you enter.

Power Zones

Provides personalized running power zones for runners who use running power as part of their training.

Race Split Sheet

Turns a race goal into pacing checkpoints to help you plan and monitor your pacing on race day.