Minimum Gas (Rock Bottom) Calculator

Calculate minimum gas requirements for emergency ascent scenarios

Quick Start

Minimum gas (rock bottom) is the protected emergency reserve needed to get divers out safely.

Use this result to set reserve and turn pressure before applying thirds/halves on remaining gas.

UTD Standards (PDF)UTD Gas Planning WorksheetGUE StandardsDAN Gas ManagementNOAA Diving Manual

Active Gear: Twinset 2x12L

Backgas 24.0L @ 232 bar

Stages 0 • Planned gas 5568L

Use this tool for emergency reserve / rock-bottom planning (out-of-gas scenario). If you need planned depth/mix suitability plus turn strategy, use Gas Envelope.
Open-circuit planning only in v1. CCR bailout workflows are intentionally deferred to a future release.

Safety Disclaimer: This calculator is for planning purposes only. Always follow your training agency's guidelines, plan conservatively, and ensure adequate gas reserves for your dive. Minimum gas calculations should be verified by a qualified dive professional before use in actual diving operations.