Strength

Dumbbell Bench Max Calculator

Updated 1 Nov 2026 · Source: Epley, Brzycki and Lombardi formulas ↗

Enter the weight of one dumbbell and the reps you pressed. You get an estimated max per dumbbell, the total for both hands, and a weight to try for a heavy single.

Worked example

Epley: 60 × (1 + 8 ÷ 30) = 76.0 lb
Brzycki: 60 × 36 ÷ (37 − 8) = 74.5 lb
Lombardi: 60 × 8^0.10 = 73.9 lb
Average of the three: (76.0 + 74.5 + 73.9) ÷ 3 = 74.8, shown as 75 lb

Estimated max per dumbbell from common sets

Dumbbell (lb)	5 reps	8 reps	10 reps	12 reps
25	29	31	33	34
35	40	44	46	48
45	52	56	59	62
55	64	69	72	76
65	75	81	85	89
75	87	93	98	103
85	98	106	111	117
100	116	125	131	137

Do the math one dumbbell at a time

Each hand moves its own weight, so the rep formulas work on a single dumbbell just as they do on a barbell. The calculator averages three of them, Epley, Brzycki and Lombardi, for one dumbbell.

With the default set of 60 lb for 8 reps, the estimate is about 75 lb per hand, or 150 lb for the pair. Since most racks go up in 5 lb steps, 75 lb is a weight you can actually pick up.

Why two dumbbells do not add up to a barbell max

A barbell ties your hands together, so the stronger side can help the weaker one and the bar follows one path. With dumbbells, each arm has to steady its own weight in every direction. Your chest and shoulders also stretch deeper at the bottom, and getting two heavy bells into place before the first rep takes effort.

All of this means the pair total is not your barbell max, and there is no fixed ratio between them. To estimate a barbell number, test a barbell set in the bench press calculator.

The jump problem on a dumbbell rack

A 5 lb step per hand sounds small, but it is a 10 lb jump for the pair. At 25 lb dumbbells that is a 20% jump; at 75 lb it is under 7%. With light dumbbells, the next pair can simply be too big a step.

When the next pair is out of reach, add reps before weight. Moving from 8 to 10 or 12 reps with the same dumbbells is a valid way to apply progressive overload.

How to get a useful test set

Use a set of 3 to 8 reps; accuracy drops above about 10.
Stop the set when your form changes, not at a forced last rep.
Keep a spotter close for heavy sets, and know how to lower the dumbbells safely to the floor beside you.

Reading the chart below the calculator

The chart lists estimated maxes per dumbbell for sets of 5, 8, 10 and 12 reps. A set of 45 lb dumbbells for 10 reps points to a max near 59 lb, and 100 lb for 5 reps points to about 116 lb.

If your gym has kilogram dumbbells, switch the unit to kg, or check the conversions on the dumbbell weight chart.

Dumbbell Weight Chart, Bench Press Calculator, Bench Press Standards, Leg Press Calculator

Questions

Should I enter the weight of both dumbbells?

No, enter one dumbbell. The calculator doubles the estimate for you and shows the pair total on its own line.

Can I work out my barbell bench from my dumbbell bench?

Not reliably. Balance, range of motion and setup differ, so the only good barbell number comes from a barbell set.

Does this work for incline dumbbell presses?

The math is the same, so you can use it for an incline press too. Just keep each estimate tied to the exercise and bench angle you tested.

How we calculate: every formula, with its author and year, is on our method page; data sources and their licenses are on sources.

This page uses data from the OpenPowerlifting project, https://www.openpowerlifting.org.

gymnical.com gives estimates from published formulas and public data. It is not medical advice and not a training prescription. Last reviewed November 2026.