1RM Leg Press Calculator
The Leg Press 1RM Calculator helps you estimate the maximum weight you can push on the leg press machine for one full repetition. Instead of testing your true one rep max (which can be unsafe), this calculator uses your submaximal lifts (weight + reps) to give you an accurate estimate of your strength. After you calculate, our AI iPersonalized Coach will appear to give you personalized training tips on how to improve your leg press strength safely and effectively.
How to Use the Leg Press 1RM Calculator
Enter the weight you lifted on the leg press.
Enter the number of repetitions performed.
Hit “Calculate” to get your estimated 1RM.
Get Tips from your personalized AI Coach in the results area.
Why Use a Leg Press 1RM Calculator?
- Track lower body progress: See how your strength develops over time.
- Safer than max testing: Avoid joint and back strain from pushing your absolute limit.
- Plan your workouts: Know exactly what weight range to use for hypertrophy, endurance, or strength training.
- Balance your lifts: Compare your leg press strength to your squat to find weaknesses.
Leg Press vs Squat Strength Ratio
How much should I leg press compared to my squat?
Most lifters can leg press 1.8 - 2.5 times their squat 1RM. For example, If you squat 100 kg, you will likely leg press between 180 - 250 kg. This is because the leg press provides stability, removes the balance factor, and allows greater loading. The difference is that squats require core strength, balance, and stabilization while leg press isolates the quads, glutes, and hamstrings while supporting the back.
Heavy leg press numbers do not always mean stronger legs. They can sometimes hide weaknesses in balance and stability. So, use both squat and leg press together. The squat builds functional strength, while the leg press allows higher volume leg training without overloading your lower back.
Safety Tips for Heavy Leg Pressing
- Do not lock out your knees at the top instead keep a slight bend.
- Keep your lower back pressed firmly against the pad.
- Control the weight on the way down; don’t let it “crash.”
- Warm up properly before heavy sets.
- Avoid extremely deep ranges if it causes hip or knee pain.