The short answer
Start a dumbbell press at about 35–40% of the barbell weight in each hand, a dumbbell row or lunge at 40–50%, and let the first set correct you. Those are starting points, not targets. The reps move up at the same time: 8–12 for most lifts, 10–15 once the rack runs out of dumbbells. Every lift below has a dumbbell version that keeps the pattern.
This is for the evening the rack is taken and for the hotel whose dumbbells stop at 25 kg.
Which dumbbell exercise replaces each barbell lift?
Each row pairs a lift with the dumbbell version that stays closest to it. The load column is where to pick up the first dumbbell. Do one set, then move one dumbbell up or down. The percentages are of the full bar load, bar included.
| Barbell lift | Dumbbell version | Start per hand (starting point) | What changes | Reps |
|---|---|---|---|---|
| Back squat | Goblet squat, one dumbbell at the chest | The heaviest you can hold at the chest | Deeper range, trunk works harder, load capped by the rack; past it, Bulgarian split squat | 8–15 |
| Front squat | Goblet squat, or two dumbbells on the shoulders | As above | Nearly the same pattern, less wrist strain | 8–15 |
| Deadlift | Dumbbell deadlift, two dumbbells outside the knees | Work up; two at the rack’s top past about 100 kg (220 lb) on the bar | Longer range because dumbbells sit lower than plates, grip gives out first; past the rack, single-leg RDL | 8–12 |
| Romanian deadlift | Dumbbell RDL, or single-leg RDL | 40–50% | Hands in front of the thighs, longer hamstring stretch, grip limits | 8–12 |
| Bench press | Dumbbell bench press | 35–40% | Longer range at the bottom, each arm stabilizes alone, getting into position is its own skill | 8–12 |
| Incline bench | Incline dumbbell press | 35–40% | As above; the shoulders choose their own path | 8–12 |
| Overhead press | Dumbbell shoulder press, seated or standing | 35–40% | No bar to steer around the face, more stability, often kinder on the shoulders | 8–12 |
| Bent-over row | One-arm dumbbell row, hand on the bench | 40–50% | One side at a time, hips supported, more range, less lower-back demand | 8–12 |
| Pendlay row | Two-dumbbell row from a dead stop on the floor | 40–45% | The dead stop stays, the load drops; chest-supported if the back is the limit | 8–12 |
| Hip thrust | Dumbbell hip thrust, one dumbbell across the hips | One dumbbell; past the rack, single-leg glute bridge | Load falls a long way; one leg at a time brings the effort back | 10–15 |
| Good morning | Dumbbell good morning, one dumbbell at the chest | One light dumbbell | Shorter lever with the load at the chest; past about 20 kg (44 lb), the single-leg RDL is the better swap | 10–15 |
| Barbell curl | Dumbbell curl, alternating or together | 40–45% | Wrists turn freely, each arm works alone, the strong side cannot cheat | 8–12 |
| Skull crusher | Dumbbell skull crusher, neutral grip | 40–45% | Elbows and wrists freer; the neutral grip is easier on the elbows | 10–15 |
| Barbell shrug | Dumbbell shrug | 40–45% | Arms at the sides, slightly longer range, grip gives out first | 10–15 |
| Upright row | Dumbbell upright row, or lateral raise | 35–40% | Wider hand path, easier on the shoulders; the lateral raise is usually the better swap | 10–15 |
| Lunge | Dumbbell walking or reverse lunge | 40–50% | Load at the sides lowers the center of mass, balance is easier, grip limits | 8–12 each leg |
| Split squat | Bulgarian split squat, dumbbells at the sides | 40–50% | Same pattern; the raised rear foot adds range | 8–12 each leg |
| Barbell calf raise | Single-leg dumbbell calf raise, free hand on the rack | The heaviest dumbbell you can hold | One leg takes the whole load, so the dumbbell needs to be far lighter than the bar was | 10–20 each leg |
| Push press | Dumbbell push press | 35–40% | Same leg drive, no rack needed, the catch overhead is easier to control | 6–10 |
| Zercher squat | Goblet squat | The heaviest you can hold at the chest | Same front-loaded pattern without the elbow discomfort; past the rack, split squat | 8–15 |
Racks step in 2 or 2.5 kg (5 lb), so the dumbbell the percentage names is rarely the one in your hand. Take the nearest one down. I would rather start a dumbbell light and move up between sets than open with a grind; an easy first set tells you more. “The rack’s top” means the heaviest dumbbell in that room, 40–50 kg (88–110 lb) in many commercial gyms and 20–25 kg (44–55 lb) in most hotels. And a word on where the percentages come from: no study I know of has measured a barbell-to-dumbbell conversion. The 35–40% is what coaches watch happen on first sets, year after year. Practice, not proof, which is why the column says starting point.
Why isn’t the dumbbell weight half the barbell weight?
A bar locks both hands to one object. The stronger side helps the weaker, and neither has to stop the weight drifting. Two dumbbells are two problems, and the arms solve them separately.
The range is longer, too. The bar stops on your chest; dumbbells go past it. The bottom of a dumbbell row or deadlift sits lower than a loaded bar ever does, and more range at the same load is more work per rep.
Then there is the setup. Kicking two 40s from your knees to the top of a press spends strength before the first rep counts, and on a hard set you feel exactly where it went.
The last reason is the rack itself. The ACSM position stand recommends raising load by 2–10% once you exceed the target reps by one or two on two consecutive sessions (Ratamess et al., 2009, Medicine & Science in Sports & Exercise). A 2 kg step on a 20 kg dumbbell is 10%, the top of that range. The one step a rack allows is often the largest step the guideline does.
Put together, the drop is biggest on presses, where stability costs most, and smallest on rows and lunges, where a bench or the floor does the bracing for you.
How much should I use? A worked example
You bench 80 kg × 8 (176 lb). The starting range for dumbbells is 35–40% per hand, which is 28–32 kg. Take the 30s (66 lb). If the first set of eight ends with about three reps still in you, that is the working weight, and it goes in the log as dumbbell bench press, 30 × 8. Easy? The next set is on the 32s. Five reps? The 28s. One dumbbell at a time, between sets.
The same day, your bent-over row is 70 kg × 8 (154 lb). Rows drop less: 40–50% is 28–35 kg, so start the one-arm row on a 32 (70 lb). Your reverse lunge with a 50 kg bar (110 lb) becomes 20–25 kg per hand; on a hotel rack that stops at 25, the 22.5s.
Warm up to the first working set the way you would with a bar. The warm-up sets calculator takes the working weight you have just chosen and gives the sets before it.
When is the dumbbell version better?
When one side has been hiding. The one-arm row, the Bulgarian split squat and the single-leg RDL show you a left-right difference the bar covers up, and because the strong side cannot take over, they close it.
When the shoulders complain. A dumbbell press lets the hands turn and the elbows travel in front of the body. A bar has to go around the chin, and the shoulder pays for that path. The upright row is the clearest case: most people who find the barbell version uncomfortable are fine with the dumbbell version or a lateral raise.
When there is no spotter. Failing a dumbbell bench press means lowering two dumbbells to the floor. Failing a barbell bench press alone at 9 p.m. in an empty gym is a different kind of problem.
When is the dumbbell version worse?
Anywhere the load has to be heavy. Two 40 kg dumbbells make an 80 kg deadlift (176 lb), which for someone pulling 140 kg (309 lb) is a warm-up set. The goblet squat ends when the dumbbell is too big to hold, long before the legs are done. Past the rack’s top dumbbell the two-handed versions stop counting, and the fix is the single-leg column in the table, where one leg takes everything. There is a grip problem in the same place: the dumbbell RDL and the shrug are over when the hands open, which is usually before the hamstrings or the traps are. Straps.
And if the goal is a bigger barbell bench or squat, the bar is the practice. Dumbbells keep the muscle through a few weeks away from it; the groove you have to go back and find.
What do I do when the dumbbells top out?
Progress the reps. An eight-week trial ran two groups through the same program, one adding load each week and the other adding reps at the same load. Muscle growth was the same in both; strength tilted slightly toward the group that added load (Plotkin et al., 2022, PeerJ). A rack that ends at 25 kg closes one of the two ways to progress. The other stays open.
The rule is the ACSM one. Pick the range, 8–12 or 10–15. Keep the weight until every set reaches the top of the range two sessions in a row, then take the next dumbbell and drop back to the bottom. If there is no next dumbbell, or the 32s and 34s have gone missing again the way they do at six o’clock, move to the one-sided version from the table, slow the lowering to three seconds, or pause a second at the bottom. The hotel gym guide works through all three on a rack that ends at 25 kg, and the 12-week beginner program lists a dumbbell version of every lift in it.
What BurnX does
In the app you set the equipment you have, and every lift in the week is written for it. If the rack is gone or the hotel has dumbbells only, you tell the coach, and it suggests the dumbbell version of each lift, as cards you accept or ignore. A swapped lift starts from what you actually lift on it, and from there it moves like every other lift: up when you did the work last week, a hold when you did not, under a hard ceiling. How BurnX decides next week’s weights has the rest.