If your buoyancy never quite feels right, there's a good chance your weighting is off. A proper buoyancy check in scuba diving is one of the simplest ways to fix that 🤿
It only takes a minute or two at the start of a dive, but getting it right can make a huge difference to your control, comfort, and air consumption underwater.
Why a Buoyancy Check Matters
Before we get into how to do a buoyancy check, it's worth understanding why it matters.
If you're not weighted correctly:
- You'll constantly adjust your BCD
- Your buoyancy control becomes harder
- You'll use more air than necessary
- Your trim and stability suffer
In our experience, many divers carry more weight than they actually need, especially in colder water.
When Should You Do a Buoyancy Check?
You should perform a buoyancy check:
- At the start of a dive trip
- When using new or different equipment
- When switching between wetsuit and drysuit
- If your buoyancy has been inconsistent
Even small changes in gear can affect your weighting more than you might expect.
How to Do a Buoyancy Check (Step by Step)
Here's a simple, reliable way to check your weighting:
1. Start at the Surface
With your BCD fully inflated, you should float comfortably at the surface.
2. Take a Normal Breath and hold it
With a full breath in:
3. Deflate Your BCD Completely
Release all the air from your BCD while staying upright in the water.
You should float at eye level
4. Exhale Slowly
As you breathe out:
You should begin to sink slowly
5. Adjust If Needed
- If you don't sink, add a small amount of weight
- If you sink too quickly, remove a small amount
Make adjustments gradually, usually in small increments, until it feels right.
What Correct Weighting Feels Like
When your weighting is right:
- You can descend without excessive effort
- You don't need large amounts of air in your BCD
- You can maintain depth with minimal adjustments
- Your breathing controls small buoyancy changes
This is the foundation of good buoyancy control.
Common Buoyancy Check Mistakes
- Checking with air still in your BCD
- Holding a deep breath instead of breathing normally
- Adding or removing too much weight at once
- Skipping the check entirely
Getting this wrong at the surface often leads to problems throughout the dive.
Don't Forget About Your Safety Stop
A good buoyancy check should translate to your end-of-dive control.
You should be able to:
- Hold your safety stop depth comfortably
- Use minimal BCD adjustments
- Rely on your breathing for fine control
If that's not happening, your weighting may still need adjusting.
Gear That Affects Your Buoyancy
Your equipment setup plays a big role in how much weight you need.
Things that affect buoyancy include:
- Exposure protection (wetsuit vs drysuit)
- Cylinder type (steel vs aluminium)
- BCD type and fit
- Accessories and added gear
You can explore relevant gear here:
Making sure your gear is properly set up will make your buoyancy check more accurate.
FAQ
How often should I do a buoyancy check?
You should do a buoyancy check whenever your gear or conditions change, for example when switching exposure suits, using different cylinders, or starting a new dive trip. If your buoyancy feels off, it's always worth checking again.
Should I do a buoyancy check with a full or empty tank?
A buoyancy check is usually done at the start of the dive with a full tank. However, as you use air, your cylinder becomes more buoyant, so you should still be able to hold your safety stop at the end of the dive.
How much weight should I add or remove?
Make small adjustments only, typically in 1–2 kg increments. Adding or removing too much weight at once can make it harder to find the right balance.
Why am I still struggling with buoyancy after a check?
Your weighting might be correct, but other factors like trim, breathing, or gear setup can still affect your buoyancy. It's worth looking at your overall setup, not just your weight.
Can I do a buoyancy check in any water conditions?
It's best to do a buoyancy check in calm, controlled conditions where you can focus properly. Strong currents or waves can make it harder to judge your buoyancy accurately.
Is buoyancy different in saltwater vs freshwater?
Yes, saltwater is more buoyant than freshwater, so you'll typically need slightly more weight when diving in the sea compared to lakes or quarries.
Do I need different weights for a wetsuit vs a drysuit?
Yes, drysuits and thicker exposure protection require more weight due to increased buoyancy. Always redo your buoyancy check when switching between them.
Final Thoughts
A proper buoyancy check in scuba diving is one of the easiest ways to improve your diving straight away.
It only takes a couple of minutes, but it can make your dives smoother, safer, and far more enjoyable 🤿
Get into the habit of checking your weighting regularly, especially when your gear or conditions change.
Get Your Gear Set Up Right at Mike's Dive Store
If you're unsure about your weighting or gear setup, we're here to help. At Mike's Dive Store, we can guide you through choosing the right equipment and getting properly balanced in the water.
Feel free to email us, book a video consultation, or visit us in-store for expert advice from divers who've been there.
