Train Smart. Lift Strong. Stay Injury-Free.

Our Mission

1RepCalculator.com was built on one goal:
To help lifters of all levels train smarter, not just harder — using proven strength science, safe programming, and personalized data.

We believe your fitness progress shouldn’t rely on guesswork. That’s why our free One Rep Max Calculator is designed to give you precise estimates that support safe, effective strength training for real, lasting results.

Meet the Creator — Jason McAllister

Hi, I’m Jason McAllister, the guy behind the keyboard and the barbell here at 1RepCalculator.com.

I’ve spent over 17 years in strength and conditioning, working as a certified personal trainer, competitive powerlifter, and strength coach in both collegiate gyms and commercial fitness centers across the U.S.

Over the years, I saw the same issue pop up with clients again and again:
They had the motivation, but not the structure.

They lifted heavy but didn’t know what weight to use each week, how to avoid injury, or when to increase the load. That’s when I realized — more people need access to real training tools and easy-to-understand guidance.

So, I built this platform.

Built on Science, Backed by Experience

Everything you read or calculate on this site is rooted in proven training methodologies — from the Brzycki formula to periodization principles trusted by elite coaches.

But it’s also tested in the real world — in home gyms, commercial gyms, and platforms where athletes chase personal bests.

Whether you’re chasing a 315 lb squat or doing your first strength cycle, this site will help you train with purpose — without risking burnout or injury.

Why Trust Us?

We focus on three things that make our site Google-trusted and user-loved:

  • Real-Life Experience – Years of hands-on coaching and strength training.

  • Accurate, Up-to-Date Calculators – No fluff. Just proven math.

  • 100% Original Content – No copy-paste advice. All writing is fact-checked, clear, and made for real humans.

What You’ll Find Here

  • The most accurate One Rep Max Calculator available — built using industry-standard formulas

  • Evidence-based training advice

  • Simple breakdowns of 1RM, training percentages, and muscle-building cycles

  • Helpful FAQs, gear guides, and safe lifting tips

We’re constantly improving the tools and content to support your strength journey.

Final Word from Jason

“Strength is earned, not gifted — but that doesn’t mean it has to be confusing. If I can help just one more lifter stay injury-free while hitting their personal bests, this entire project will be worth it.”
— Jason McAllister, CPT, Strength Coach

Thanks for visiting 1RepCalculator.com.
Train smart. Lift heavy. And check back often — we’re just getting started.