Planning a backpacking trip or long day hike? The Trail Calorie Calculator helps you estimate your total daily energy expenditure on the trail based on your body weight, pack weight, hiking speed, terrain grade, and duration. Whether you're a thru-hiker, weekend warrior, or scout leader, knowing your calorie burn is essential for packing enough food and avoiding bonking.
This tool uses the widely accepted Pandolf equation, which accounts for the metabolic cost of walking with a load on varying slopes. Simply enter your details, and the calculator will break down your estimated calories burned per hour and total for the day. Use the results to plan your meal quantities, snacks, and hydration strategy for a safe and energetic adventure.
🥾 Trail Calorie Calculator
📊 Results
How to Use This Tool
Enter your body weight, pack weight, average hiking speed, terrain grade (as a percentage, e.g. 5 for a 5% incline), and the duration of your hike. Use the unit dropdowns to switch between metric and imperial. Click Calculate to see your estimated total calorie burn and breakdown. Use the preset buttons for quick examples.
Formula Explained
This calculator uses the Pandolf equation, a widely accepted metabolic cost model for loaded walking. The formula calculates metabolic power (in watts) as:
M = 1.5W + 2.0(W+L)(v/3.6)² + (W+L)(v/3.6)³ / (3.6²)
G = G% × (W+L) × 9.81 × (v/3.6)
Total Power = M + G (watts)
Where W = body mass (kg), L = load mass (kg), v = speed (km/h), G% = grade fraction.
Calories per hour are derived by converting watts to kcal/h (1 watt = 3.6 kJ/h, 1 kcal = 4.184 kJ). The total is then multiplied by the number of hours hiked.
Worked Examples
Example 1: A 70 kg hiker carrying a 15 kg pack, hiking at 5 km/h on a 5% grade for 6 hours.
M = 1.5×70 + 2×(85)×(1.389)² + 85×(1.389)³ / 12.96 ≈ 105 + 328 + 18 = 451 W
G = 0.05 × 85 × 9.81 × 1.389 ≈ 57.9 W
Total = 509 W → 509 × 3.6 / 4.184 ≈ 438 kcal/h → 438 × 6 = 2,628 kcal
Example 2: A 60 kg hiker with a 10 kg pack, speed 6 km/h, 2% grade, 4 hours.
M = 1.5×60 + 2×(70)×(1.667)² + 70×(1.667)³ / 12.96 ≈ 90 + 389 + 25 = 504 W
G = 0.02 × 70 × 9.81 × 1.667 ≈ 22.9 W
Total = 527 W → 527 × 3.6 / 4.184 ≈ 453 kcal/h → 453 × 4 = 1,812 kcal
Tips & Best Practices
- Weigh your pack fully loaded with water and food for accuracy.
- Use a GPS or phone app to track your average speed and elevation gain.
- Terrain grade can be estimated from elevation gain / distance (e.g., 300 m gain over 6 km = 5% grade).
- Add 10-20% to the calculated calories to account for rest breaks, uneven terrain, and metabolic inefficiency.
Frequently Asked Questions
How accurate is the Pandolf equation? It was validated in laboratory and field studies and is considered reliable for steady-state hiking on groomed trails. It may underestimate on very rough terrain or overestimate on flat, hard surfaces.
Should I eat back all the calories I burn? Most hikers aim for a moderate deficit of 200-500 kcal/day to avoid weight gain while maintaining energy. Adjust based on your goals.
What about downhill sections? The equation assumes positive grade. For descents, energy expenditure is lower (about 60-70% of uphill). For a balanced route, use the average grade.
Can I use this for running or cycling? No — this tool is specifically for walking with a load. For running, see our Sports Calorie Calculator.