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One Rep Max (1RM) Calculator

Calculate your maximum single-rep lifting capacity (1RM) using Epley and Brzycki strength equations. Includes a complete training percentage table for workout planning.

Measurement System:

Weight Lifted & Repetitions

Estimated One Rep Max (1RM)
115 kg

Average of Epley (117kg) and Brzycki (113kg) formulas.

Working Weight Percentages

100%1 rep
115 kgMaximal Strength
95%2 reps
109 kgHeavy Strength
90%3-4 reps
104 kgPower / Strength
85%5-6 reps
98 kgHypertrophy / Power
80%7-8 reps
92 kgMuscle Growth
75%9-10 reps
86 kgHypertrophy
70%11-12 reps
81 kgEndurance / Volume

How to One Rep Max (1RM) Calculator

Simple 3-step guide to instant conversion

1

Input Weight Lifted

Enter the weight you lifted in kg or lbs.

2

Input Completed Reps

Enter how many clean repetitions you achieved with good form.

3

Get 1RM & Percentage Table

Plan strength, power, and hypertrophy training blocks accurately.

Why Calculate 1RM from Submaximal Reps?

Testing a true one-rep maximum barbell lift carries substantial neurological fatigue and injury risk. Using scientific submaximal prediction formulas allows lifters to calculate their 1RM with precision from a safe 3 to 8 rep set.

Calculates 1RM from submaximal sets (1 to 15 reps) safely
Validated Epley & Brzycki strength formula computations
Comprehensive percentage load chart (100%, 95%, 90%, 85%, 80%, 75%, 70%)
Supports barbell bench press, back squats, deadlifts, and overhead press

One Rep Max (1RM) Calculator – Complete User Guide & Health Breakdown

Estimate your 1RM (maximum single-repetition lift) safely using validated Epley and Brzycki strength equations with training percentage tables.

The Science of One Rep Max (1RM) Estimation (Epley & Brzycki Formulas)

Testing a true 1RM with maximal weight carries substantial injury risk, especially on heavy compound movements like the squat, bench press, and deadlift. Our calculator uses the scientifically validated Epley equation (1RM = weight × (1 + reps/30)) and Brzycki formula (1RM = weight × (36 / (37 - reps))) to accurately predict your maximum single lift from submaximal sets of 2 to 10 repetitions.

Strength Training Percentage Chart: 60% to 95% Repetition Ranges

Periodized strength programs (such as 5/3/1, Wendler, and powerlifting blocks) prescribe working sets as percentages of your 1RM. EasyConverty generates an instant percentage breakdown from 95% down to 60%, showing you the exact barbell loads to program for hypertrophy, power, and maximum strength.

How to Safely Test and Progress Your Maximum Lifts

Input your heaviest recent set with clean form (e.g. 225 lbs for 5 reps). The calculator outputs your theoretical 1RM (approx. 262 lbs) and allows you to track strength progression over time without risking joint trauma.

Quick Comparison

EasyConverty vs. Other Online Converters

See why running One Rep Max (1RM) Calculator directly on your device is faster, safer, and 100% free.

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100% Private (0 uploads)
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Instant (Zero wait)
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Up to 50 files batch
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Frequently Asked Questions About One Rep Max (1RM) Calculator

Which 1RM formula is most accurate?+

The Epley and Brzycki equations are the gold standards in sports science, with high correlation for sets performed between 2 and 10 repetitions.

What percentage of 1RM builds muscle best?+

Hypertrophy is most efficiently stimulated with training loads between 70% and 85% of your 1RM for sets of 6 to 12 repetitions.

How does EasyConverty convert files with One Rep Max (1RM) Calculator?+

EasyConverty runs client-side WebAssembly, Canvas, and JavaScript libraries directly inside your web browser. When you select your files, they are decoded and processed in your local computer RAM without transmitting a single byte to an external server.

Is One Rep Max (1RM) Calculator 100% free with no hidden charges?+

Yes! There are no subscription tiers, paywalls, or trial periods. You can convert unlimited files completely free.

Are my private photos and documents secure?+

Yes, 100% secure. Because no file is ever uploaded to any cloud storage or server, your confidential documents remain strictly under your personal control at all times.

Can I batch convert multiple files at once?+

Yes, you can upload multiple files simultaneously and download them individually or as a single ZIP archive.

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