Buoyancy Calc is a free utility tool available on iPhone that allows scuba divers to quickly determine the suggested weight they should add based on their diving environment. Developed by Eric Hamiter, this app is designed to help divers achieve neutral buoyancy by providing them with an estimate of the weight needed.

With Buoyancy Calc, users can enter their weight in pounds or kilograms and select the type of water, tank, and exposure suit they will be using. The app then calculates a suggested amount of weight that will help keep the diver neutrally buoyant in the chosen environment. It is important to note that this app and the developer are not officially affiliated with PADI, but the suggested weight is based on PADI's Peak Performance Buoyancy basic weighting guideline.

While the app provides a good estimate, it is important to make adjustments based on individual factors such as gender, physique, exposure suit age, and accessories. Buoyancy Calc is a handy tool for scuba divers looking to fine-tune their buoyancy and optimize their diving experience.