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Dumbbell to barbell calculator

Enter a dumbbell bench press set: the weight of one dumbbell, your reps, and how many you had left. In studies that tested both lifts in the same lifters, the pair of dumbbells came to 80 to 83% of the barbell max, so the calculator turns your set into a barbell bench max, a likely range, and barbell loads for your next session.

Example result

Estimated barbell bench press 1RM

~95.5kg

Likely range

94–97.5kg

Sets of 8, 2 in reserve

72.5kg

30 kg × 8 with 2 in reserve points to a 39 kg dumbbell bench press (per dumbbell) max.

barbell bench press working loads, rounded to 2.5 kg
Reps	RIR	Load
5	2	80 kg
8	2	72.5 kg
10	2	70 kg
12	2	67.5 kg

Build a barbell bench press session

Dumbbell to barbell examples

Four lifters moving from dumbbells to a barbell, each with a different reason and a different next step.

Example 1

Switching to a barbell program

An intermediate lifter starting a barbell plan after a year of dumbbell pressing: 40 kg dumbbells for 5 with 2 left.

dumbbell bench press (per dumbbell) weight
40 kg
Reps completed
5
Reps in reserve
2
- Estimated barbell bench press 1RM~118 kg
- Likely range115.5–120 kg
- Sets of 8, 2 in reserve90 kg
The range is narrow because the studies agree closely, but the barbell is still new. Run the sets of 8 for two weeks and let the reps in reserve, not the estimate, decide when to add 2.5 kg.

Build a barbell bench press session Open with these numbers
Example 2

Home dumbbells to a gym bench

A lifter who trained at home with 80 lb dumbbells, 6 reps with 1 left, and just joined a gym.

dumbbell bench press (per dumbbell) weight
80 lb
Reps completed
6
Reps in reserve
1
- Estimated barbell bench press 1RM~236 lb
- Likely range231–240 lb
- Sets of 8, 2 in reserve180 lb
A converted max is a starting point, not a test. Open with the sets of 8, then after two weeks take one heavier set of 3 to 5 and run it through the bench press calculator for a real barbell number.

Build a barbell bench press session Open with these numbers
Example 3

First time under the bar

A woman who presses 16 kg dumbbells for 6 with 2 left and wants to try the barbell bench.

dumbbell bench press (per dumbbell) weight
16 kg
Reps completed
6
Reps in reserve
2
- Estimated barbell bench press 1RM~48.5 kg
- Likely range47.5–49.5 kg
- Sets of 8, 2 in reserve37.5 kg
Her working sets land under 40 kg, so a 20 kg bar with small plates is the start. If the gym's lightest jump is 2.5 kg, she adds reps before weight.

Build a barbell bench press session Open with these numbers
Example 4

Too many reps to convert

A beginner who did 50 lb dumbbells for 10 with 1 left.

dumbbell bench press (per dumbbell) weight
50 lb
Reps completed
10
Reps in reserve
1
- Estimated barbell bench press 1RM~164 lb
Eleven reps to failure is too many for a reliable estimate. Pick up the next dumbbells, do a set of 5 to 8 with 1 or 2 left, and enter that instead.

Build a barbell bench press session Open with these numbers

Barbell to dumbbells: the reverse conversion

Going the other way, each dumbbell max is about 40.8% of the barbell max (40 to 41.5%). The last column is the pair to pick for sets of 8 with 2 reps left, rounded to 2.5 kg or 5 lb dumbbells.

Barbell bench max to dumbbells, per dumbbell
Barbell bench 1RM	Dumbbell max, each	Likely range	Sets of 8, 2 in reserve, each
60 kg	24.5 kg	24–25 kg	20 kg
80 kg	32.5 kg	32–33 kg	25 kg
100 kg	41 kg	40–41.5 kg	32.5 kg
120 kg	49 kg	48–50 kg	37.5 kg
140 kg	57 kg	56–58 kg	45 kg
135 lb	55 lb	54–56 lb	40 lb
185 lb	75 lb	74–77 lb	60 lb
225 lb	92 lb	90–93 lb	70 lb
275 lb	112 lb	110–114 lb	85 lb
315 lb	128 lb	126–131 lb	100 lb

Why the barbell number is higher

With dumbbells, each arm balances its own weight. In a study of 12 trained men, the dumbbell pair came out 17% below the barbell max, while the chest and front shoulder worked just as hard in both. A 2012 study of 56 men put the barbell about 20% ahead.

So a dumbbell press isn't weaker chest work, it's a harder balance task. For the dumbbell max itself, use the dumbbell bench press calculator.

How the conversion works

First your set becomes a dumbbell max with the RIRLift app's formula: Epley, counting the reps you had left. Then the per-dumbbell max is doubled and divided by the share the pair came to in the two studies: 83% (Saeterbakken and colleagues) and 80% (Jackson), averaged to 81.5% for the headline, with the two ends as the range.

Working loads come back from that barbell max through the same formula, rounded to 2.5 kg or 5 lb.

dumbbell max = weight × (1 + (reps + RIR − 1) ÷ 30)
barbell max = dumbbell max × 2 ÷ 0.815

30 × (1 + (8 + 2 − 1) ÷ 30) = 39 kg
39 × 2 ÷ 0.815 = 95.7, shown as 95.5 kg

Technique for both presses

The lift you enter

Flat Dumbbell Press

Chest

Dumbbells lowered to chest level give a real number; half reps stopped high inflate it. Count only reps where the handles reach your chest.

How to do it

Sit on the end of a flat bench with the dumbbells standing on your thighs, then lie back and use your knees to help them up to your chest as your back reaches the bench.
Plant your feet, squeeze your shoulder blades back and down, and press the bells up until they sit over your chest with your palms facing your feet.
Lower the dumbbells under control, letting your elbows travel down and out at roughly a 45-degree angle from your torso.
Stop when the handles reach chest level and you feel a stretch across the chest, with your forearms vertical.
Press back up, bringing the bells slightly toward each other at the top without clanking them together.

Cues

Shoulder blades pinned
Forearms vertical
Press up and in

Common mistakes

Flaring the elbows straight out to the sides: tuck them partway so your upper arms point a little toward your hips.
Picking up dumbbells you cannot get into position: if the kick-up is a struggle, the set will be too; go lighter.

Full dumbbell bench press guide

The lift you get

Barbell Bench Press

Chest

The converted max assumes a full bench: bar to the chest, no bounce. Hold the barbell to that standard and your first sessions will match the numbers.

How to do it

Lie on the bench with your eyes just under the bar and plant your feet flat, a little wider than your hips.
Pull your shoulder blades together and down into the bench, keeping a small arch in your lower back with your glutes on the pad.
Grip the bar a little wider than shoulder width and lift it out so it sits over your shoulders.
Lower the bar under control to your lower chest, elbows about 45 degrees from your sides.
Touch your chest without bouncing, then press up and slightly back toward the hooks.

Cues

Shoulder blades pinned
Elbows at 45 degrees
Touch, then press

Common mistakes

Bouncing the bar off the chest, which adds reps the muscles didn't earn.
Lifting the hips to finish a rep: that rep doesn't count toward a max.

Full bench press guide

Make it fit you

Enter one dumbbell

The weight is per dumbbell, the number stamped on one handle. A pair of 30 kg dumbbells is entered as 30.
Use a set of 3 to 8

Heavy dumbbells are awkward to get into position, so lifters often use high reps. Past 10 reps to failure the estimate stops being useful; pick heavier dumbbells for the test set.
Start at the sets of 8

Your first barbell sessions are practice as much as work. Begin at the sets-of-8 load and add weight when every set finishes with 2 or more reps left.
Fractional plates

Light benchers moving to a 20 kg or 45 lb bar can find 2.5 kg jumps too big. Use 0.5 or 1.25 kg plates, or add a rep per set before adding weight.
Going back to dumbbells

Use the reverse table above, then pick the closest pair your gym has and adjust reps to land at 2 in reserve.

Questions

How do I convert dumbbell bench to barbell bench?

Double your dumbbell max and divide by 0.815, or enter a set above. In two studies, the dumbbell pair came to 80 to 83% of the barbell max.

Is dumbbell bench weight per hand or both combined?

Per hand here, the weight of one dumbbell. That is how the calculator, the reverse table and the RIRLift app all count it.

If I press 70 lb dumbbells, what can I bench?

That depends on the reps. 70 lb dumbbells for 8 with 2 left converts to about a 223 lb barbell bench max (219 to 228 lb); enter your own set above.

What dumbbells should I use if I bench 225?

About 92 lb each for a max, and 70 lb dumbbells for sets of 8 with 2 reps left. The reverse table has other numbers.

Why can I lift more with a barbell than dumbbells?

One bar is easier to balance than two separate weights. The chest works just as hard; the extra balance work is what costs load.

Sources

Track both presses in one place

Log load, reps and RIR on every dumbbell and barbell set and RIRLift keeps each lift's estimated max current, then sets the loads for your next session.

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Dumbbell to barbell calculator

Example result

Dumbbell to barbell examples

Switching to a barbell program

Home dumbbells to a gym bench

First time under the bar

Too many reps to convert

Barbell to dumbbells: the reverse conversion

Why the barbell number is higher

How the conversion works

Technique for both presses

Flat Dumbbell Press

How to do it

Cues

Common mistakes

Barbell Bench Press

How to do it

Cues

Common mistakes

Make it fit you

Enter one dumbbell

Use a set of 3 to 8

Start at the sets of 8

Fractional plates

Going back to dumbbells

Questions

Dumbbell bench press calculator

Bench press calculator

Barbell calculator

Smith machine bar weight

Dumbbell bench press guide

Bench press guide

Sources

Track both presses in one place

Dumbbell to barbell calculator

Example result

Dumbbell to barbell examples

Switching to a barbell program

Home dumbbells to a gym bench

First time under the bar

Too many reps to convert

Barbell to dumbbells: the reverse conversion

Why the barbell number is higher

How the conversion works

Technique for both presses

Flat Dumbbell Press

How to do it

Cues

Common mistakes

Barbell Bench Press

How to do it

Cues

Common mistakes

Make it fit you

Enter one dumbbell

Use a set of 3 to 8

Start at the sets of 8

Fractional plates

Going back to dumbbells

Questions

Related calculators and templates

Dumbbell bench press calculator

Bench press calculator

Barbell calculator

Smith machine bar weight

Dumbbell bench press guide

Bench press guide

Sources

Track both presses in one place