Calculate Maintenance Calories with Zone 2 Training
The complete formula for accurate TDEE based on your aerobic training volume.
The Zone 2 TDEE Formula
TDEE = BMR × Activity Multiplier + Zone 2 Direct Burn + EPOC
Zone 2 volume determines your multiplier: 2-3 hrs/week (1.375), 4-5 hrs/week (1.55), 6+ hrs/week (1.725)
Step 1: Calculate Your BMR
Use the Mifflin-St Jeor equation (most accurate for general population):
Mifflin-St Jeor Formula:
Men:
BMR = (10 × weight kg) + (6.25 × height cm) - (5 × age) + 5
Women:
BMR = (10 × weight kg) + (6.25 × height cm) - (5 × age) - 161
Example: A 35-year-old male, 180 lbs (81.6 kg), 5'10" (178 cm):
BMR = (10 × 81.6) + (6.25 × 178) - (5 × 35) + 5 = 1,816 calories
Step 2: Apply Zone 2 Volume Multiplier
| Zone 2 Volume | Activity Level | Multiplier |
|---|---|---|
| 0-1 hours/week | Sedentary/Lightly Active | 1.2 - 1.375 |
| 2-3 hours/week | Lightly Active | 1.375 |
| 4-5 hours/week | Moderately Active | 1.55 |
| 6+ hours/week | Very Active | 1.725 |
*Assumes desk job. Add 0.1-0.15 if you have an active occupation.
Step 3: Calculate Zone 2 Direct Calorie Burn
400-500
Walking (Zone 2)
per hour
500-600
Cycling (Zone 2)
per hour
450-550
Swimming (Zone 2)
per hour
Formula: Weekly Zone 2 Calories = Hours × Calories/Hour
Example: 4 hours cycling × 550 cal/hr = 2,200 calories/week (314 calories/day)
Step 4: Add EPOC (Afterburn Effect)
Zone 2 training elevates metabolism for 2-4 hours post-exercise. Calculate daily EPOC:
Complete Calculation Example
Profile: 35M, 180 lbs, 4 hrs Zone 2 cycling/week
1. BMR: 1,816 calories
2. Base TDEE (1.55): 1,816 × 1.55 = 2,815 calories
3. Zone 2 Direct Burn: 4 hrs × 550 cal ÷ 7 days = +314 calories/day
4. EPOC (4 hrs/week): +85 calories/day
Total Maintenance: ~3,214 calories/day
Frequently Asked Questions
Should I eat back Zone 2 calories?
If your goal is maintenance, yes—eat your full TDEE including Zone 2 burn. For weight loss, create a 300-500 calorie deficit from your calculated maintenance.
How often should I recalculate?
Recalculate every 4-6 weeks if your Zone 2 volume changes significantly, or if your weight changes by 5+ pounds. Small adjustments prevent plateaus.
Does Zone 2 affect muscle gain calories?
Yes—add 200-300 calories above your Zone 2 maintenance for lean muscle gain. The aerobic base supports recovery and nutrient partitioning.