How to Do Dumbbell Curls
A dumbbell curl is a biceps exercise done standing with a dumbbell in each hand. Keep your elbows at your sides, curl the dumbbells to your shoulders and have your palms facing up by the time your forearms are level. It trains the biceps, brachialis and brachioradialis. Most lifters do 3 sets of 8 to 15 reps.
- 1Start. Stand tall with a dumbbell in each hand, arms straight at your sides and elbows close to your body.
- 2Top. Keep your upper arm still, turn your palm up and curl the dumbbell to your shoulder. Alternating arms, as here, works the same way.
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How to do a dumbbell curl
- Stand tall with your feet hip-width apart and a dumbbell in each hand, arms straight at your sides.
- Turn your palms forward. If the dumbbells hit your thighs, start with your palms facing in and turn them up as soon as the dumbbells clear your legs.
- Pin your elbows to your sides. Curl the dumbbells toward your shoulders by bending only at the elbows, both together or one at a time.
- Stop when your forearms meet your biceps, before your elbows start to move forward. Squeeze for a second.
- Lower over 2 to 3 seconds until your arms are fully straight.
Where the dumbbell curl is hardest
A dumbbell pulls straight down, so the load on your biceps depends on how far the dumbbell sits in front of your elbow. With your arm straight it hangs right under the elbow and the biceps holds almost nothing. The curl is hardest with your forearm level and gets lighter again near the top, but only goes fully slack there if your elbows drift forward. A cable works differently: where you stand moves the hard part of the rep. Standing close to the stack gives almost the same curve as the dumbbell.
Straighten your arms fully every rep, even though the bottom is light. Training only the bottom half of a dumbbell preacher curl grew the biceps near the elbow more than training the top half (Pedrosa 2023). For more load in that stretched position, add a preacher or Bayesian curl.
How much weight should you dumbbell curl?
On Gravitus, the median man lifts 32.5 lb (15 kg) per dumbbell for 10 reps on the dumbbell curl, and the median woman 20 lb (9 kg).
- Most lift
- 27.5 to 40 lb
- Top 10% lift
- 50 lb or more
- Starting out
- under 27.5 lb
- Most lift
- 17.5 to 25 lb
- Top 10% lift
- 32.5 lb or more
- Starting out
- under 17.5 lb
- Most lift
- 12 to 18 kg
- Top 10% lift
- 22.5 kg or more
- Starting out
- under 12 kg
- Most lift
- 7 to 11 kg
- Top 10% lift
- 15 kg or more
- Starting out
- under 7 kg
Palms up, rotating or alternating?
The biceps bends the elbow and turns the palm up, so it works hardest with the palm up. A palms-up grip drew 12% more biceps activity than a neutral grip and 19% more than an overhand grip (Coratella 2023). In a typical dumbbell curl the palm starts half-turned and is fully up by the time the forearm is level (Marcolin 2018). Either way works, as long as your palm is up for the hard middle of the rep.
What the research says
Four common dumbbell curl claims the research does not back:
- Rotating your wrist builds the peak. Both heads of the biceps turn the palm, so the twist favors neither. A dumbbell held in the middle of the handle barely resists the turn, so rotating adds almost no load. What counts is having the palm up while the curl is hardest.
- Dumbbells work the biceps harder than a bar. At the same relative load, EZ-bar curls drew more biceps activity than dumbbell curls (Marcolin 2018).
- Alternating lets you lift more. Gravitus lifters log about the same weight per hand for alternating and two-arm curls. Alternate if it stops you swinging.
- Never straighten your arms at the bottom. In a review of 11 trials, full range and bottom-half partials grew the biceps more than top-half partials (Kassiano 2023). Straightening your arm is how you reach that part of the rep.
Muscles worked
Dumbbell vs cable vs barbell curl
| Attribute | Dumbbell | Cable | Barbell |
|---|---|---|---|
| Hardest point | Halfway | You choose, by stance | Halfway |
| Palm | Turns freely | Set by the attachment | Fixed palms up |
| Weight jumps | 5 lb per hand | 5 to 10 lb | 2.5 lb or less |
| Best for | One arm at a time, full supination | Load at the bottom, drop sets | Heaviest loads |
Close to a tie for growth. A dumbbell and a barbell load the curl the same way, and over 10 weeks cable and barbell preacher curls grew the biceps 7% and 8% (Nunes 2020). Pick the one you can keep adding weight to, or use two.
Sets, reps and progression
Stop each set 0 to 2 reps short of failure. Sets taken close to failure build muscle across a wide range of reps (Schoenfeld 2021), so pick a range you can keep strict.
A 5 lb (2.5 kg) jump is big on a light dumbbell. Add reps first: when every set reaches the top of your range, move up one dumbbell and drop back to the bottom of the range.
Common mistakes
-
Swinging the torsoYour back and hips lift the weight, not your biceps. Go a dumbbell lighter until you can stand still.
-
Elbows drifting forwardYour front delts take over and the top of the rep goes slack. Keep your elbows at your sides.
-
Palms staying inA half-turned palm makes the hardest part of the rep a hammer curl. Turn your palm up as soon as the dumbbell clears your thigh.
-
Stopping short at the bottomThe stretched part of the rep has the strongest growth evidence. Straighten your arms every rep.
-
Dropping the weightLower over 2 to 3 seconds instead of letting the dumbbells fall.
Dumbbell curl variations
Questions people ask
What muscles does the dumbbell curl work?
The biceps and brachialis, with the brachioradialis helping. Your forearms, front delts and core hold you still.
Should I rotate my wrist when doing dumbbell curls?
Turn your forearm so your palm faces up by the time the dumbbell is halfway, but keep the wrist itself straight. A palms-up grip drew 12% more biceps activity than a neutral grip (Coratella 2023). Starting palms in is fine if the dumbbells hit your thighs.
Should I curl one arm at a time?
Either works. Alternating makes it easier to stay strict and focus on each arm, and curling both arms saves time. Gravitus lifters log about the same weight per hand both ways, and no trial has compared the two for growth.
Are dumbbell curls push or pull?
Pull. The biceps pulls your forearm toward your upper arm, so curls fit on a pull day with rows and pulldowns.
Is the dumbbell curl better than the cable curl?
Not for growth. Standing close to the stack, a cable curl loads the rep almost the same way. Dumbbell curls drew more biceps activity than Bayesian cable curls at 80% of max (Parpa 2025), but activity is not growth, and cable and barbell preacher curls grew the biceps equally over 10 weeks (Nunes 2020).
How much weight should I dumbbell curl?
For 10 reps, the median on Gravitus is 32.5 lb (15 kg) per dumbbell for men and 20 lb (9 kg) for women. The strongest quarter lifts 40 lb (18 kg) and 25 lb (11 kg) or more.
Log every set and see your percentile on every lift, dumbbell curl included.
Get GravitusRelated exercises
- Marcolin et al. 2018. PeerJ 6:e5165.
- Coratella et al. 2023. Sports 11(3):64.
- Pedrosa et al. 2023. Sports 11(2):39.
- Kassiano et al. 2023. J Strength Cond Res 37(5):1135-1144.
- Nunes et al. 2020. Int J Environ Res Public Health 17(16):5859.
- Parpa et al. 2025. Muscles 4(4):45.
- Schoenfeld et al. 2021. Sports 9(2):32.