Enter your machine weight and total reps to calculate your calories burned doing leg extensions. At a standard 18-inch range of motion, 100 lb burns about 0.27 calories per rep, or about 2.68 calories for 10 reps.
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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.
