Free scuba diving computers and calculators

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These calculators help you plan. Depthlog remembers every dive. Track your SAC, log your Nitrox mixes, and keep your certifications in one place. Create your free account.

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Surface Air Consumption

Compute the true Surface Air Consumption with our advanced algorithm

Tank autonomy calculator

Calculate how long your scuba tank will last at a given depth based on your SAC rate

Consumption autonomy calculator

Compute the true depth and time autonomy based on the Surface Air Consumption

Nitrox calculator

Compare the Nitrox with the Air and learn the pros and the cons of diving with enriched air

Best Nitrox Mix

Find the optimal oxygen percentage for your target depth to maximize bottom time

Weight calculator

Estimate the amount of weight you need in different diving situations

Equivalent Air Depth calculator

Compute the EAD of different depths and for different Nitrox mixtures

CNS Oxygen Clock

Calculate CNS oxygen toxicity exposure and cumulative percentage across multiple dives

Nitrogen Narcosis & END Calculator

Calculate END and narcotic load. Plan trimix composition to reduce narcosis at depth. Free nitrogen narcosis calculator for air, EANx, and trimix.

Repetitive Dive & Surface Interval Calculator

Plan consecutive dives: calculate Residual Nitrogen Time (RNT), pressure groups and surface interval credit for air and Nitrox

Minimum Gas & Rock Bottom Calculator

Calculate your rock bottom turn pressure and the minimum gas needed to ascend safely with your buddy

Nitrox Blending Calculator

Blend any Nitrox (EAN) mix: compute oxygen and air to add with partial pressure or continuous blending, plus MOD

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