Respiratory Minute Volume (RMV) is the amount of gas that a diver consumes during a dive expressed as a volume. The measurement is expressed as on the surface. All these terms are used universally by divers to measure and keep track of your breathing rate on the surface. Some call your breathing rate your Respiratory Minute Volume (RMV) or even Surface Consumption Rate (SCR). If your dive computer is air integrated there is a good chance that your dive computer calculates your SAC rate for you.Įven if your dive computer isn’t air integrated, there’s a chance the app or software that connects to your computer can calculate your SAC rate for you.īecause information about your dives is stored by the dive computer, all you need to do is enter the information about the cylinder you used for the dive, your starting pressure, and your ending pressure to have the software calculate your SAC rate.Īn important distinction is that not all dive computers / Instructors / textbooks use the term SAC rate. You can calculate your SAC rate manually, by using a calculator like the one on this page, or you can also get your SAC rate from many dive computers. In Technical diving use it to calculate the amount of gas needed for decompression and in case of emergencies.Track your progress as a diver to see how you improve from dive to dive.Choose the correct sized tank for a dive.Estimate how much gas will be needed for a given dive.Knowing your SAC rate is important for several reasons, you can use it to: As you can see from the image below, the deeper you go the more gas you will consume. This means that a diver who, for example, breathes 30 PSI per minute on the surface will use 60 PSI at 33 feet (10 meters) and 90 PSI at 66 feet (20 meters). Because atmospheric pressure increases as we dive deeper, the deeper we go, the more gas we consume. It’s extremely important to understand that the measurement is expressed at the surface. In the metric system, we measure surface air consumption in BAR per minute. In the imperial system, it is measured in pounds per square inch (PSI) per minute. Surface Air Consumption (SAC) rate is a measurement used to express how much gas a diver uses while diving. So, how can you measure the amount of gas being consumed by a diver? This is where your SAC rate comes in. It’s not uncommon as a beginning diver to come back to the boat with just your reserve pressure while your instructor still has their tank half full. Efficient divers will use less gas than someone new and still learning to SCUBA dive. One of the main things that separate experienced and efficient divers from novices is the amount of gas they consume during a dive.
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