If you are new to strength training, a common question is, do dumbbells weigh on each side? The total weight of a dumbbell is the combined mass of the handle and all the plates attached to it. Understanding how this weight is distributed is crucial for selecting the right load for your workouts and ensuring you train safely and effectively.
This guide will explain exactly how dumbbell weight is measured and distributed. We will cover different types of dumbbells, how to calculate the weight on each side, and why this knowledge matters for your fitness progress.
Do Dumbbells Weigh On Each Side
The simple answer is yes, the weight is typically distributed on each side of the handle. For a standard adjustable dumbbell, the weight you see labeled (like 20 lbs or 10 kg) is almost always the total weight. This total includes the bar or handle plus all the plates. Therefore, the weight on each side is roughly half of that total, but you must account for the handle’s weight first.
For example, a 20 lb adjustable dumbbell might have a 5 lb handle and 15 lbs of plates. In this case, each side would hold 7.5 lbs of plates, but the handle’s weight is centralized. The feeling in each hand is still the full 20 lbs, but the load on each end of the bar is not a simple 10 and 10 split.
Understanding Total Weight Versus Side Weight
It’s essential to distinguish between the total weight you lift and the weight placed on each end of the dumbbell. This distinction affects how you load adjustable dumbbells and understand fixed-weight pairs.
When you pick up a dumbbell, you are lifting the entire object. Your muscles feel the sum of all its parts. However, when loading plates onto an adjustable dumbbell, you need to think about the weight on each side to balance it correctly.
How To Calculate Weight Per Side
Follow these steps to determine the weight on each side of an adjustable dumbbell:
- Identify the total desired weight (e.g., 30 lbs).
- Subtract the weight of the dumbbell handle itself (e.g., 6 lbs).
- The remainder is the total plate weight (e.g., 24 lbs).
- Divide the total plate weight by two to find the plate weight per side (e.g., 12 lbs per side).
So, for a 30 lb total with a 6 lb handle, you would put 12 lbs of plates on each end. This calculation ensures the dumbbell is symmetrical and safe to use.
Types Of Dumbbells And Their Weight Distribution
Not all dumbbells are created equal. The way weight is distributed depends heavily on the design.
Fixed-Weight Dumbbells
These are the solid, often rubber-coated dumbbells you see in rows at the gym. They are a single piece of cast iron or concrete encased in plastic or rubber. The weight labeled on them is the total weight. The mass is distributed evenly across the entire unit, but the ends are typically heavier than the center grip. You do not need to calculate anything; a 25 lb fixed dumbbell is 25 lbs total.
Adjustable Dumbbell Sets
These consist of a straight or contoured handle, collars (clamps or screws), and separate weight plates. The total weight is variable. As calculated above, you must account for the handle’s mass. Always refer to the manufacturer’s specifications to know your handle’s weight, as it can vary.
Selectorized or Dial Dumbbells
These are the all-in-one adjustable systems like Bowflex or PowerBlock. You select a weight by turning a dial or inserting a pin. The system internally distributes the correct amount of weight to each side. The number you select is the total weight per dumbbell. The distribution is handled for you, making them very convenient.
Why Knowing The Weight Per Side Matters
Understanding this concept is not just academic; it has practical applications for every lifter.
- Safety: Improperly loading an adjustable dumbbell can cause plates to slide off during an exercise, posing a serious risk. Evenly distributed weight is stable weight.
- Accuracy in Progression: To consistently overload your muscles, you need to know exactly how much weight you are adding. If you think you’re adding 5 lbs total but are actually adding 2.5 lbs per side, your progression will be inaccurate.
- Exercise Balance: For unilateral exercises (working one side at a time), using a correctly balanced dumbbell ensures one side isn’t compensating for the other, promoting muscular balance.
- Equipment Longevity: Consistently overloading one side of an adjustable dumbbell can bend the bar or damage the threading on the collars over time.
Common Mistakes And Misconceptions
Many beginners and even intermediate lifters can get confused about dumbbell weight.
Assuming “Per Side” Labeling
In commercial gyms, fixed-weight dumbbells are almost always labeled with their total weight. A rare exception might be some old equipment or specific brands, but this is uncommon. Always assume the number is the total unless explicitly stated otherwise (e.g., “25 lbs per side”).
Forgetting the Handle Weight
The most frequent error with adjustable sets is ignoring the handle. If your handle weighs 5 lbs and you put a 10 lb plate on each side, your total is 25 lbs (5 + 10 + 10), not 20 lbs. This can lead to lifting more than intended.
Mismatching Plates
Using different weight plates on each side of an adjustable dumbbell creates an imbalance. This makes the dumbbell awkward to control and increases injury risk. Always use identical plates on both ends.
Step-by-Step Guide To Loading Adjustable Dumbbells
To ensure you do this correctly every time, follow this numbered process.
- Place the dumbbell handle on a flat, stable surface.
- Check that your collars (spin locks, spring clips, etc.) are present and functional.
- Calculate the required plate weight per side using the method described earlier.
- Slide the calculated plate(s) onto one end of the bar, ensuring they sit flush against the handle’s collar.
- Secure that side with its collar immediately to prevent plates from falling off when you tilt the dumbbell.
- Repeat the process on the opposite side with the same weight plates.
- Double-check that both collars are tightened securely by trying to spin the plates with your hand; they should not move.
- Lift the dumbbell with both hands in a controlled manner to test the balance before beginning your exercise.
How To Choose The Right Dumbbell Weight For You
Knowing how weight is distributed helps you choose the correct starting weight for your goals.
- For Strength: Choose a weight where you can perform 1 to 6 reps with proper form before fatigue. The weight on each side should feel challenging but controllable.
- For Hypertrophy (Muscle Growth): Aim for a weight that allows 6 to 12 reps per set. The last few reps should be difficult.
- For Muscular Endurance: Select a lighter weight that enables you to perform 15 to 20+ reps with good form.
A general rule is if you can perform more than two extra reps than your target on the first set, the weight is too light. If you cannot reach the minimum reps with proper form, the weight is to heavy.
FAQ Section
Here are answers to some frequently asked questions about dumbbell weight.
Is a 20 lb dumbbell 20 lbs on each side?
No, not typically. For a fixed-weight dumbbell, the 20 lb marking refers to the total weight of the entire piece of equipment. You are lifting 20 lbs total in one hand. The weight is distributed across the dumbbell, but each end does not weigh 20 lbs independently.
How do you measure dumbbell weight?
Dumbbell weight is measured as the total mass of the complete unit. For adjustable types, you must add the weight of the handle to the weight of all plates on both sides. The most accurate method is to use a bathroom scale: weigh yourself alone, then weigh yourself holding the dumbbell, and subtract the difference.
Are dumbbell weights listed per dumbbell or per pair?
This is a critical distinction. When you buy a set of dumbbells, they are almost always sold as a pair. A listing for “20 lb dumbbells” usually means you get two dumbbells, each weighing 20 lbs total. Always read the product description carefully to confirm if the price is for a single dumbbell or a pair.
What does “kg per dumbbell” mean?
This phrasing explicitly tells you that the number refers to the total weight of one individual dumbbell. For example, “10 kg per dumbbell” means each dumbbell in the pair weighs 10 kg, so you are buying two 10 kg dumbbells.
Can I use different weights on each side of a dumbbell?
You should never intentionally use different weights on each side of a single dumbbell. This creates a dangerous imbalance, making the dumbbell unpredictable and difficult to control, which significantly increases the risk of dropping it or straining a muscle.
Maintaining Your Dumbbells
Proper care ensures your dumbbells remain accurate and safe for years to come.
- Wipe down fixed-weight dumbbells with a dry cloth after use to prevent rust and sweat damage.
- For adjustable dumbbells, periodically check the threads on the handles and collars for wear. Lightly oil metal threads if they begin to squeak or become difficult to turn.
- Store weight plates flat and organized to prevent chipping (for cast iron) or cracking (for plastic-coated).
- Avoid dropping dumbbells, especially adjustable ones or those with selectorized mechanisms, as this can misalign internal components and affect weight distribution.
By following these tips, you can be confident that the weight you intend to lift is the weight you are actually lifting. This precision is key to making consistent strength gains and staying safe in your training.