How Much Weight Do You Really Need for Scuba Diving?

Ask a group of scuba divers how much weight you should use, and you'll probably get a lot of different answers. Some divers will tell you to use a percentage of your body weight. Others will tell you what works for them. And plenty of divers simply keep using the same amount of weight they were given during their Open Water course. But proper weighting isn't really about finding a magic number. It's about carrying enough weight to comfortably control your buoyancy throughout the entire dive, including at the end of the dive when your cylinder is lighter. And sometimes, carrying a little extra weight because "I'd rather be heavy than light" can actually make diving more difficult.

Why Extra Weight Can Make Diving Harder

Adding a few extra pounds may make your initial descent easier, which is probably why many divers feel more comfortable being slightly overweighted. The problem comes once you're underwater. If you're carrying more weight than necessary, you'll need to add more air to your BCD to compensate for that weight. Now you're carrying additional lead while also creating a larger bubble of air inside your BCD. As your depth changes, that air expands and contracts. That can mean more frequent BCD adjustments, larger buoyancy changes, and more work throughout the dive. You may find yourself adding air, dumping air, kicking to correct your position, and then repeating the process. What felt easier during the first 30 seconds of the dive can make the next 45 minutes more difficult.

So How Much Weight Should You Use?

Unfortunately, there isn't one formula that works for every diver. Your correct weighting depends on several factors, including your exposure protection, cylinder, BCD, equipment configuration, body composition, and whether you're diving in saltwater or freshwater. Even the same diver may need different amounts of weight on different dives. Switch from a thin wetsuit to a thicker wetsuit and you'll probably need more weight. Switch from freshwater to saltwater and you'll need to compensate for the additional buoyancy. Change cylinders or BCDs and your weighting may change again. That's why saying, "I always dive with 12 pounds," isn't necessarily the best approach. Proper weighting should match the diver, equipment, and environment you're diving in that day.

Your Cylinder Makes a Difference

Your cylinder is another important part of the equation. Different cylinders have different buoyancy characteristics, and those characteristics can change as you breathe the gas inside them. A common aluminum scuba cylinder, for example, becomes more positively buoyant as it empties. That means the weighting that feels perfect at the beginning of your dive needs to account for what will happen near the end. This is an important distinction because being able to descend at the beginning of a dive doesn't necessarily mean you're properly weighted. The real test comes later. Can you comfortably maintain your safety stop near the end of the dive when your cylinder has significantly less gas in it? That's a much better indication that your weighting is appropriate.

Weight Amount and Weight Placement Are Different Problems

There's another part of weighting that often gets overlooked:

How much weight you're carrying and where that weight is located are not the same thing.

You may have the correct total amount of weight but still struggle with your body position because of where it's distributed. If most of your weight is concentrated around your waist, for example, you may find your lower body dropping. Moving a small amount of that weight into trim pockets can sometimes improve your position without changing your total weight at all. This is why adding or removing weight isn't always the answer when a diver struggles with trim. Sometimes the amount is correct. The distribution needs adjustment.

If sinking legs are something you regularly struggle with, our article Why Do My Legs Keep Sinking While Scuba Diving? goes into this in much more detail.

What Does a Proper Weight Check Look Like?

A proper weight check is one of the easiest ways to establish a starting point. At the surface with a normal breath, an empty BCD, and the regulator in your mouth, you should generally float around eye level when properly weighted. When you exhale normally, you should begin to descend. But that's only the beginning of the process. Ideally, weighting should also be evaluated toward the end of a dive when your cylinder is closer to reserve pressure.

You should still be able to remain comfortably neutral at your safety-stop depth without having to fight to stay underwater. That's the part many divers never test.

Signs You May Be Overweighted

Being overweighted isn't always obvious. You may still have excellent dives while carrying more weight than necessary. But there are clues. You might need a significant amount of air in your BCD while at depth. You may constantly adjust your inflator and dump valves. Your body position may feel unstable, or you may find yourself kicking upward whenever you stop swimming. Another common sign is a descent that happens very quickly once you release the air from your BCD. A controlled descent shouldn't feel like you're dropping an anchor.

Can You Be Underweighted?

Absolutely.

The goal isn't to remove as much weight as possible. Being underweighted creates its own problems, particularly near the end of a dive. If you can't comfortably remain at your safety stop as your cylinder empties, you may need additional weight. This is why turning proper weighting into a competition isn't particularly useful. Using less lead doesn't automatically make someone a better diver. Using the correct amount makes diving easier.

Your Weighting Will Change as You Grow as a Diver

Something else we've seen many times is that divers gradually need less weight as they gain experience. That doesn't necessarily mean their equipment changed. They changed.

New divers are often tense at the surface. Their breathing may be faster and deeper, and they may unknowingly hold more air in their lungs while attempting to descend. Adding weight can seem like the solution. As they become more relaxed and learn to control their breathing and body position, they sometimes discover they don't need as much weight as they once did. That's why it's worth reassessing your weighting occasionally rather than automatically using the same number forever.

Proper Weighting Makes Everything Else Easier

Weighting isn't an isolated scuba skill. It affects almost everything else you do underwater.

Proper weighting makes buoyancy easier to control. Better buoyancy helps improve trim.

Better trim reduces drag. Less drag means less effort. And less effort can contribute to better air consumption.

That's why we spend time evaluating weighting when working with divers at Your Dive Concierge.

Sometimes a diver believes they have a buoyancy problem or a kicking problem when part of the solution is simply getting their equipment properly balanced. Small adjustments can completely change how diving feels. The goal isn't to dive with the least amount of weight possible. It's to carry the right amount of weight, in the right places, for you and the dive you're making. When you get that right, you'll probably spend a lot less time fighting your equipment—and a lot more time enjoying the dive.