Perform fast calculations with our user-friendly online calculator! Conveniently crunch numbers and solve equations instantly. Ideal for quick math tasks, our tool simplifies your daily computations effortlessly. Try our intuitive calculator for accurate results on the go!
Easily calculate your one rep max with our free online Max Repetition Calculator. Fast, accurate, and perfect for bench, squat, deadlift, and more.
Want to know how much you can lift for just one powerful rep? Whether you're a beginner or an experienced lifter, understanding your one rep max (1RM) is key to building strength and tracking progress. That's why we created this easy-to-use Max Repetition Calculator to help you calculate your 1 rep max for exercises like the bench press, squat, deadlift, or any lift based on your current performance.
No complex math. No guessing. Just input your weight and reps, and let the calculator do the work.
A One Rep Max, or 1RM, is the maximum amount of weight you can lift for one full repetition of a given exercise. This is a common strength benchmark in weight training and fitness. It helps lifters:
Let’s say you can bench press 150 pounds for 6 reps. Your 1RM will be higher than 150 because you're not maxing out. Our calculator will estimate your true max based on that input.
Not everyone wants to max out in the gym – it can be risky and tiring. A 1RM calculator gives you a safe and quick estimate of your maximum strength based on reps you can do comfortably.
This tool is perfect for exercises like:
It also works great for 5x5 workouts, strength splits, and general progressive overload tracking.
Using the Max Repetition Calculator is simple:
The tool will instantly give you your estimated 1 Rep Max (1RM).
You’ll also get weight percentages to use in your training — like 70% of your 1RM, which is ideal for building endurance or muscle.
The most common formula used in our tool is the Epley Formula:
1RM = Weight × (1 + Reps ÷ 30)
So, if you lifted 100 pounds for 8 reps:
1RM = 100 × (1 + 8 ÷ 30)
1RM = 100 × 1.2667 = 126.67 lbs
This formula is widely used by coaches and athletes because it balances accuracy and ease of use.
We also support other formulas like Brzycki, Lombardi, and O'Conner in our backend to give the most reliable average.
Here's a quick reference if you're lifting without a calculator:
| Reps | % of 1RM |
|---|---|
| 1 | 100% |
| 2 | 95% |
| 3 | 93% |
| 4 | 90% |
| 5 | 87% |
| 6 | 85% |
| 7 | 83% |
| 8 | 80% |
| 9 | 77% |
| 10 | 75% |
So, if your 1RM is 200 pounds, then lifting 150 pounds would be around 75% of your max ideal for 10 reps.
Our Max Repetition Calculator is a fast, safe, and reliable way to estimate your 1 rep max without lifting to failure. Whether you’re building strength, planning a program, or just curious about your potential, this tool has your back.
Stop guessing and start lifting smarter. Input your stats and find out what you're really capable of today.
It estimates your maximum lifting capacity for one rep, helping you plan training zones.
Use the calculator with your 5-rep weight. It will convert it to an estimated 1RM, and you can reverse-calculate from that.
Usually around 10 reps at 70% of your 1RM, depending on your fitness level.
It means adding small, gradual increases (like 1–2%) to your lifts to improve safely over time.
Not always. That’s why using a repetition calculator is the safer method to estimate your strength.