Calculate calories burned doing leg extensions from body weight, effort level, and session time, or from machine weight, reps, sets, and range of motion.
Leg Extension Calories Burned Formula
The basic calculator uses a standard 18-inch movement path for each rep.
C = W × R × 0.00268
The advanced calculator adjusts for a custom range of motion.
C = W × R × D × 0.00179
- C = calories burned
- W = loaded machine weight in pounds
- R = total reps
- D = one-way movement distance in feet
Example: 100 lb × 10 reps × 0.00268 = 2.68 calories.
Leg Extension Calories Per 10 Reps
| Loaded Weight | Calories for 10 Reps | Calories per Rep |
|---|---|---|
| 50 lb | 1.34 | 0.13 |
| 100 lb | 2.68 | 0.27 |
| 150 lb | 4.02 | 0.40 |
| 200 lb | 5.36 | 0.54 |
What Is a Leg Extension?
The leg extension is a machine-based isolation exercise that trains knee extension. It primarily targets the quadriceps, especially the rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius.
Leg Extension Quick Facts
- Main muscle group: quadriceps
- Primary joint action: knee extension
- Common training ranges: 10 to 15 reps for moderate sets, 15 to 20 reps for lighter burn sets
- Higher load, more reps, and longer movement distance all raise calories burned
- Basic mode is best for quick set logging on standard selectorized machines
How to Use the Calculator
- Select Basic for a standard 18-inch movement path.
- Enter the loaded machine weight and your total reps.
- Select Advanced if you want to enter a custom range of motion.
