One-Rep Max Calculator — Fast, Free & Accurate Online Calculator
Estimate your one-rep max from any completed set using the Epley and Brzycki formulas. See your full training-percentage table — free, instant and 100% in your browser.
Whether you are completing a quick one-off task or managing high-volume everyday workflows, the EZPZTool One-Rep Max Calculator delivers fast, reliable, and 100% private results right inside your browser.
Why Use EZPZTool's One-Rep Max Calculator?
Unlike traditional web utilities that require file uploads to remote cloud servers, enforce daily usage quotas, or bombard you with intrusive ads and subscription paywalls, EZPZTool processes everything directly on your machine.
- Total Privacy: Your data never transmits across the network or gets logged in cloud databases.
- Lightning Fast Speed: Instantaneous processing powered by your device's multi-core hardware.
- Zero Installation: Works directly in Chrome, Edge, Safari, Firefox, and mobile browsers.
- Completely Free: No accounts, no signups, and no hidden trial limitations.
How to Use the Tool in 3 Simple Steps
- Open the One-Rep Max Calculator in any modern browser.
- Provide Your Input or Files: Drag and drop your file or enter the required parameters into the intuitive interface.
- Get Instant Results: View, copy, or download your processed results in one click.
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Frequently Asked Questions
How accurate is an estimated one-rep max?
Epley and Brzycki formulas are well-validated for sets of up to about ten reps and give a useful training estimate. They are not a substitute for a real tested 1RM.
Which formula should I use?
Epley is the most common default. The Average option blends Epley and Brzycki and is a good middle ground for newer lifters.
Why does the table show rep counts per percentage?
The percentages map to common training loads — 85 percent of 1RM is roughly a five-rep working weight — so you can plan sets straight from the table.