Running Calories & Race Energy Calculator
Compute running energy expenditure based on distance and pace, plan race-day fuel requirements, and estimate science-backed calorie burn using heart rate data
Weight in pounds (lbs)
Format: MM:SS (e.g. 9:30 or 5:45)
Total Estimated Calories Burned
595 kcal
Estimated Run Duration: 47 mins 30 secs
Burn Rate: ~119 kcal/mile • Equivalent to ~2.1 Slices of Pizza
Calories Per Distance Unit
119 kcal / mi
Energy cost per mile/kilometer
Total Run Duration
47:30
Calculated from distance and pace
Average Speed
6.32 mph
Ground speed velocity
Food Equivalency
2.1 Slices Pizza
Based on ~280 kcal per standard slice
Race Distance & Nutrition Strategy
Projected Finish Time & Total Energy Output
1h 57m 51s (1,572 kcal)
Recommended Fuel: 3 Energy Gels (60g carbs/hr)
Hydration Target: 400–600 ml fluids + electrolytes per hour
Estimated Finish Time
1:57:51
Target duration at set pace
Total Energy Expenditure
1,572 kcal
Total caloric burn during race
Carb Fueling Recommendation
3 Gels (90g total)
Consume every 45 mins after 1st hour
Fluid Intake Strategy
800–1,200 ml total
Sip small amounts frequently
Science-Backed Heart Rate Calorie Burn (Keytel et al.)
Total workout time
Average beats per minute
Heart Rate Based Energy Expenditure
562 kcal
Zone 4 Threshold Effort (~12.5 kcal/min)
Formula: Keytel (2005) Individualized Oxygen Consumption Mapping
Total Calories Burned
562 kcal
Personalized cardiovascular burn
Burn Rate Per Minute
12.49 kcal/min
Energy expenditure velocity
Cardio Training Zone
Zone 4 (Threshold)
High intensity aerobic effort
Method Accuracy
High Precision
Accounts for age, sex, weight & HR