Skip to main content
DiveCalc
Tools

Scuba Diving Calculators

Calculate Nitrox fills and MOD, END, breathing rate, gas requirements, repetitive-dive tissue loading, and unit conversions.

Nitrox Calculator: MOD & Best Mix
Gas Management
Calculate the depth where a Nitrox mix reaches a selected PPO2 threshold, or the best mix for a planned depth.
Open tool
Equivalent Air Depth Calculator
Gas Management
Find the air depth with the same nitrogen loading as a Nitrox dive, with the EAD formula, PPO2, and MOD.
Open tool
Nitrox Blending Calculator
Gas Management
Calculate ideal oxygen and air additions for empty-cylinder and residual-gas Nitrox fills.
Open tool
END and Trimix Calculator
Gas Management
Calculate trimix partial pressures and Equivalent Narcotic Depth under an explicit narcotic-gas convention.
Open tool
Gas Top-Up Calculator
Gas Management
Find the final oxygen, helium and nitrogen percentages after topping up a cylinder with any known gas.
Open tool
Gas Density Calculator
Gas Management
Check breathing gas density at depth against the published 5.2 g/L recommended and 6.2 g/L maximum.
Open tool
Cylinder Capacity Calculator
Gas Management
Convert between a cylinder's water volume and its rated free-gas capacity at working pressure.
Open tool
Dive Weighting Adjustment Calculator
Dive Planning
Adjust a verified weighting for salt or fresh water, a different cylinder, or a gear change.
Open tool
Real-Gas Cylinder Estimate
Gas Management
Estimate gas removed from measured cylinder endpoint states and compare the conventional pressure-volume rule.
Open tool
CNS & OTU Exposure Planner
Dive Planning
Track retained CNS percentage and cumulative OTU across ordered dive segments and surface intervals.
Open tool
Dive SAC Rate Calculator
Dive Planning
Calculate your Surface Air Consumption rate from dive data for better gas planning.
Open tool
RMV Converter
Dive Planning
Calculate SAC rate from dive data and convert to RMV for tank-independent gas planning.
Open tool
Rock Bottom Gas Calculator
Dive Planning
Calculate the minimum gas a team needs for a shared-gas ascent from depth and the matching reserve pressure for your cylinder.
Open tool
Gas Consumption Planner
Dive Planning
Model gas use from breathing rate, depth, and time with a selected pressure allocation.
Open tool
Dive Unit Converter
Dive Planning
Quickly convert psi/bar, feet of seawater to bar, ft/m, and lb/kg without changing unit preferences.
Open tool
Bottom Time & Decompression Calculator
Dive Planning
Model a direct ascent or whole-minute mandatory stops for a single-level ZHL-16C air or Nitrox dive.
Open tool
Repetitive Dive Calculator
Dive Planning
A dive table alternative: see residual nitrogen and remaining no-stop time across a sequence of dives and surface intervals.
Open tool

Want the theory behind the numbers? Explore practical guides on Nitrox, SAC/RMV, PPO2 limits, and dive safety.

Read the diving guides

Want the next tool when it lands?

Get a short note when DiveCalc ships a useful new tool or a meaningful update.

Occasional updates. No spam. Unsubscribe anytime.