About us
About Us
Free strength calculators for lifters who want honest numbers — no account, no app to install, and no guesswork about what to put on the bar.
Every tool on this site answers one simple question: how strong are you, really — and what should you lift next?
Why this site exists
Why This Site Exists
Most percentage-based programs assume you already know your 1RM. They do not tell you how to find it, how reliable the number is, or what to do when the calculator you used gives a different result from the one your training partner used. This site exists to close that gap.
The calculators take the weight and reps from a set you have already done and return a working 1RM estimate, alongside a full percentage table you can actually train from. No max-day test required. No guesswork on what to put on the bar on Tuesday.
And the guides explain the parts a calculator cannot, because knowing your 1RM is only useful if you know what to do with it.
Who is behind it
Who Is Behind It
This site is built and run by people who train with barbells and program off percentages — in commercial gyms and home setups, through real training cycles, testing true maxes and estimating them, and paying close attention to how percentage-based loading actually behaves from week to week.
We are not researchers or academics, and we do not pretend to be. What we bring is practical: years of working through the same problems every serious lifter runs into when they try to program intelligently off a number they are not entirely sure is accurate.
Why We Built These Tools
The calculators we found were either cluttered with ads and popups, running a single formula with no explanation of which one, or built by people who clearly had not thought about how a lifter actually uses the output. Most gave you a number and stopped there. None showed you the spread across formulas, so you had no way to gauge how reliable the estimate was. None connected the estimate to a training percentage table in a way that was actually useful.
We built these tools to do all of that in one place: an estimate you can check, a percentage and rep-max table that updates from your input, and guides that explain the reasoning behind the number. The goal is simple — a number you can trust enough to train with, and the understanding to use it well.
What you will find here
What You Will Find Here
RPE Calculator
Rate a set by how hard it felt, and get your estimated max plus the weight for any target RPE — built on the Reactive Training Systems chart.
1RM Percentage Calculator
Turn your max into exact training weights for every percentage, with training zones, rounding, and a printable table.
Rep Range to 1RM Converter
Convert any set — reps and weight — into an estimated max, or work backwards from a percentage to the reps it allows.
Powerlifting Total Calculator
Add your squat, bench press, and deadlift into one total, plan your attempts, and check your weight class.
Strength Standards Calculator
Compare each lift against your bodyweight and see your level, from beginner to elite, with the gap to the next band.
Wilks Score Calculator
Score your total with the Wilks 2020 formula, so you can compare lifters across bodyweights on one scale.
DOTS Score Calculator
Score your total with the DOTS formula — the standard many federations use today — with men’s and women’s coefficients.
The Guides
The guides cover the topics a calculator cannot: what a 1RM actually means, how each formula was developed and where it breaks down, how to test safely, how to read strength standards relative to your bodyweight, and how to build a program around the number you have. They are written for lifters who want to understand the reasoning, not just copy a template.
Editorial standards
Editorial Standards
Pages on this site name real formula authors with their publication years, name specific programs correctly, and draw on published research. When evidence is mixed or unsettled, that is stated directly rather than smoothed over. No studies are invented. No anecdotes are fabricated. When a formula has a known limitation, we say so and explain why.
These calculators give estimates, not guarantees. An estimated max is a starting point for training, not a promise of what you can lift on meet day — and no calculator can judge your technique, your fatigue, or your health on a given day. Nothing here is personal coaching, and nothing here is medical advice.
Who this site is for
Who This Site Is For
This site is built for lifters who already train and want to train more intelligently:
- Intermediate lifters running percentage-based programs who need exact training weights.
- Powerlifters tracking competition lifts and comparing scores across weight classes.
- CrossFitters managing loading across multiple movements.
- Coaches who need a quick, honest reference for their athletes.
If you are looking for motivational content or beginner workout plans, this is not the right place. If you want to understand your numbers and use them properly, it is.
Get in touch
Get in Touch
Email us with feedback on a calculator, corrections to a guide, or suggestions for topics we have not covered. Email is not a coaching service — we do not write personal programs by email.
Email: [email protected]
Response time is typically within 2 business days.