221 lb works out to 2x45 per side plus the bar — call it 225 lb in practice, since gyms rarely stock the odd change. 6 reps sits comfortably inside the 2-to-10 range these formulas were fitted on, so this estimate is about as reliable as the method gets. Your 185 lb set represents about 84% of the estimated max.
How far 221 lb can be trusted
Six reps is where the equations start to separate. The 12 lb between 213 and 225 lb is wider than the same lifter would see from a triple, because past five reps the different curve shapes behind each formula begin to matter. Conditioning also starts to leak into the answer: a six-rep set asks something of your work capacity that a single does not, and lifters who are strong but poorly conditioned come out under-estimated here.
Training loads from a 221 lb max
Programmes are written as percentages of the max, not as absolute weights. From 221 lb, rounded to the nearest 5 lb:
| Percentage | Load | Typical set |
|---|---|---|
| 95% | 210 lb | Heavy single |
| 90% | 200 lb | Doubles and triples |
| 85% | 190 lb | Sets of four to five |
| 80% | 175 lb | Sets of six |
| 75% | 165 lb | Sets of eight |
| 70% | 155 lb | Volume work, ten or more |
221 lb loads as 2x45 per side plus the bar, or 225 lb on the bar. Round every figure in that table to the nearest 5 lb and stop there — the seven formulas disagree by 12 lb on this set, so chasing a two-pound difference is chasing noise. If your gym stocks 2.5 lb pairs, save them for the top two rows, where a small miss costs the most reps.
The formulas behind this answer, and their limitations
The table above the fold is Epley (1985), Brzycki (1993), Lombardi (1989), O'Conner (1989), Wathan (1994), Lander (1985) and Mayhew (1992), each applied to 185 lb for 6 reps; the headline figure is their median. All seven assume a set taken close to failure with clean technique. At 6 reps you are still inside the fitted band, but conditioning is now affecting the result alongside strength, and the seven have begun to curve away from each other. They also under-rate strong, experienced lifters, who hold a higher percentage of max at any rep count than the regression average. The full account — the populations behind each equation, what a bounced rep does to it, and why we stop at ten reps — is set out on the methodology page. Warm up thoroughly and use safety bars or a spotter before going anywhere near 221 lb. This is a training estimate, not medical advice.