🏋️One-Rep Max Calculator
Estimate 1RM using Epley, Brzycki, and Lander formulas.
🆓 Free🔒 Secure⚡ Instant📱 Mobile-friendly🚫 No signup
Calculate your one-rep max online for free using three lifting formulas.
Epley Formula116.7 kg
Brzycki Formula112.5 kg
Lander Formula113.7 kg
Average Estimate114.3 kg
How to Use One-Rep Max Calculator — Step by Step
- 1Enter the weight you lifted and the number of reps completed
- 2Click 'Calculate 1RM' — your estimated one-rep maximum is calculated using the Epley formula
- 3View your training percentages — 60%, 70%, 80%, 90% of 1RM
- 4Use the percentages to plan strength training program loads
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Frequently Asked Questions
Is this tool completely free?
Yes. All ToolNest tools are 100% free with no signup required, no account, and no watermarks added to output files.
Are my uploaded files secure and private?
All uploads use HTTPS encryption during transfer. Files are processed on secure isolated servers and automatically deleted within 2 hours of upload.
Does this tool work on mobile phones?
Yes. ToolNest works on any modern browser on iPhone, Android, tablet, or desktop — no app download or plugin needed.
Do I need to create an account?
No. Just open the tool, upload your file, and download the result. No email, no signup, no password.