Set of Five Finder
5 Rep Max Calculator
Enter any weight and rep count and get your 5 rep max, the heaviest set of five you should be able to hit, plus your 1RM, 3RM and 10RM alongside it, back-off set weights and the plates to load.
Working Weights Around Your 5RM
A top set and the back-offs that follow it, all sets of 5.
| Intensity | Weight | Use it for |
|---|---|---|
| 100% of your 5RM | 231 lb | The top set, all out |
| 97.5% of your 5RM | 225 lb | Back-off set 1 |
| 95% of your 5RM | 219 lb | Back-off set 2 |
| 92.5% of your 5RM | 214 lb | Back-off set 3 |
| 90% of your 5RM | 208 lb | Back-off set 4 |
A true 5RM is one hard set. For five sets of five, work from the 90 percent row and add weight once every rep is there.
How the 5 Rep Max Calculator Works
Any set in, a hard set of five out.
Your 5RM is the heaviest weight you can lift for five clean reps and no sixth. The calculator turns the set you entered into a one-rep max using five established prediction formulas, then runs those same equations backwards to the five-rep mark and averages the results. A set of five typically lands somewhere near 86 or 87 percent of a one-rep max.
Entering 245 lb for 3 reps gives a one-rep max near 266 lb and a 5RM near 231 lb. Because the conversion is symmetrical, entering a set of five returns almost exactly the weight you typed, which is a handy way to see the maths behaving itself.
Five long established prediction equations, Epley, Brzycki, Lombardi, Lander and Wathan, averaged in both directions. For coaching and testing standards the recognised professional body is the National Strength and Conditioning Association (NSCA). Estimates are guidance, not coaching or medical advice.
Why the 5RM Is the Most Useful Number in the Gym
Heavy enough to build strength, light enough to repeat.
Sets of five are the backbone of nearly every program that has survived contact with real lifters. Five reps is heavy enough that the weight has to be respected, and light enough that you can take several sets of it, twice a week, for months. That combination is what makes strength move.
It is also the safest useful test. A set of five leaves the bar moving until the very end, so you get a genuine read on your strength without the risk profile of a single. Linear progression programs, five sets of five, three sets of five, and the first week of a 5/3/1 cycle all live in this range, which is why a trustworthy 5RM tells you more about what to load tomorrow than a max single does.
If you keep one number in your training log, keep this one. A 5RM that goes up every few weeks is the clearest evidence that a program is working, and it needs no peaking, no singlet and no spotter shouting.
Programming From Your 5RM
What to do with the number once you have it.
For a straight five by five, do not use your 5RM as the working weight. A true 5RM is one hard set, and five sets of it does not exist. Take 85 to 90 percent of it for the first block, get all twenty five reps, then add weight. The back-off rows in the table above are the same idea in one place.
For a single top set of five followed by volume, the 5RM is the target on your best day and slightly under it on an average one. Leave a rep in reserve on the top set for most of the training block and spend that rep only when the block is ending.
Recalculate whenever a set of five goes better than expected. That is the honest trigger, and it beats retesting on a schedule.
What the Estimate Cannot See
Where a converted set of five drifts.
How close you took the entered set to failure decides everything. Stop three reps early and the estimate reads low. Grind out a last rep that bent in half and it reads high, because that rep was not a rep. The formulas cannot tell the difference, so you have to.
Conditioning also plays a part by the time you reach five reps. Two lifters with the same single can be ten pounds apart at five reps because one of them trains sets of five constantly and the other never does. Take the estimate, test it with one honest set, and trust what happened over what was predicted.
More Rep Max Tools
The rest of the family, all from the same set.
Frequently Asked Questions
What lifters ask about sets of five.
What is a 5 rep max?
A 5RM is the heaviest weight you can lift for five clean reps with nothing left for a sixth. It is the most common way to gauge working strength because it is heavy without being risky.
What percentage of my 1RM is a 5 rep max?
A set of five is usually around 86 to 87 percent of a one-rep max. It varies between lifters and lifts, which is why this calculator averages five formulas rather than using one fixed number.
Should I use my 5RM as the weight for 5x5?
No. A 5RM is one hard set. For five sets of five, start at 85 to 90 percent of it, complete all the reps, then add weight. Using your true 5RM for all five sets usually falls apart by the third.
How do I test my 5 rep max?
Warm up properly, work up in threes, then take one all-out set of five at the estimate above. If the fifth rep moves well, add a small amount and try again after full rest, but keep it to one or two attempts.
How often should I recalculate it?
Whenever a working set of five goes better than expected, which for most lifters is every few weeks. Rebasing your percentages on a fresh number keeps the rest of your training honest.