Reproduce gas availability and demand already selected in one named responsible plan, with explicit cylinder, schedule, allowance and independent records—without generating a bottom time or safety approval.
Specialist tool for Scuba Diving1 documented formula4 real workflowsPrivate in your browser
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A quick decision brief for this specific tool
Inputs that matter
One de-identified reviewed plan scope and basis; explicit imperial or metric cylinder system; named responsible-plan, cylinder-rating, segment-schedule, external-allowance and independent-demand records; starting/reviewed-boundary pressure; matching rated free-gas capacity/rated pressure; reviewed segment minutes, average ATA and combined surface-volume rate; externally prepared non-segment allowance; and same-unit independent total demand
Output to expect
Reviewed pressure boundary, cylinder constant, surface gas available within that entered boundary, reproduced segment and total surface-gas demand, externally prepared allowance, signed availability balance, demand pressure equivalent and signed independent-demand difference
How it works
Convert the entered pressure boundary through the matching cylinder constant, reproduce segment demand from the reviewed combined surface-volume rate × copied average ATA × reviewed minutes, add only the externally prepared allowance and compare both availability and an independent total-demand record
Confirm the exact cylinder rating pair, actual fill/gauge conditions, average-ATA source, combined demand-rate basis and every component of the externally prepared allowance with the responsible plan owner; do not substitute water capacity, maximum depth or a universal percentage/pressure rule.
A positive or negative balance is arithmetic—not safe/unsafe, go/no-go, reserve, turn-pressure or duration approval. Keep exposure limits, ascent/decompression, oxygen, buddy/failure gas, environment/workload, equipment and operational authorization with current training, operator procedures and qualified supervision.
Choose your path
Built around the job you need to finish
Reconcile gas availability and demand already selected in one named responsible dive plan without generating a bottom time, reserve, turn pressure or safety authorization.
Responsible dive-plan reviewer reconciling gas records
Check that a named pressure boundary, cylinder rating, segment demand and external allowance reproduce the plan worksheet without letting a browser choose operational values.
Select the coherent unit system, retain every source record, copy the responsible plan values and compare boundary availability, reproduced demand and an independent total.
Can identify an arithmetic or record mismatch while exposure, reserve, ascent/decompression, team, equipment and authorization remain with the responsible procedure.
Instructor reviewing a supervised gas-planning exercise
Show a trainee where segment gas ends and externally prepared non-segment/contingency gas begins without teaching an undocumented percentage or universal pressure rule.
Load the education example, inspect the cylinder constant and five calculation steps, then repeat with coherent metric records and a deliberately changed independent total.
Gets a traceable teaching comparison and can explain why a positive balance is not a safe-dive verdict.
Scuba trainee distinguishing reconciliation from approval
Understand why maximum depth, a nominal tank name and one SAC/RMV value do not determine a complete future dive plan.
Name the reviewed plan, cylinder, schedule, allowance and independent records, test invalid pressure ordering and explain which decisions the worksheet refuses to make.
Can reproduce the entered arithmetic without treating the result as a duration, reserve, turn-pressure, ascent or decompression instruction.
Authoritative checks for this tool
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
Keep the exact rated free-gas capacity/rated-pressure pair together and use one coherent imperial or metric record. The entered boundary comes from the responsible plan; the arithmetic does not recommend it or substitute water capacity, test pressure or an unrelated cylinder mark.
Average ATA, duration, combined surface-volume rate and non-segment allowance must come from named responsible records. The allowance can represent only what its source actually prepared; this worksheet does not invent ascent, decompression, buddy, failure, reserve or contingency components.
Total demand = reviewed combined surface-volume rate × copied average ATA × reviewed minutes + external allowance
Signed Comparisons, Not Operational Approval
The signed values reveal arithmetic or record mismatches. Positive, zero and negative results are not safe/unsafe, go/no-go, reserve, turn-pressure or duration verdicts and do not establish exposure, equipment or team requirements.
Copy the reviewed pressure boundary and exact cylinder rating, reproduce segment plus externally prepared non-segment demand, and compare an independent total without changing the responsible plan.
Run the 50 scf education example, inspect every unit transition, then repeat with coherent metric records and explain why the signed balance cannot authorize the exercise.
Change the independent total or pressure ordering, follow the explicit error/comparison, and identify which schedule, allowance, cylinder or independent source must be reviewed.
FAQ
No. It means only that the entered boundary gas exceeds the reproduced demand under the entered records. Exposure, ascent/decompression, oxygen, buddy/failure gas, environment, workload, equipment, actual fill and operational authorization remain outside this arithmetic.
No. It copies a pressure boundary already selected by the responsible plan. It does not recommend 500 psi, rule of thirds, a percentage margin or any other reserve/turn method.
Maximum depth does not describe the complete segment, and depth-to-pressure conversion depends on water and surface-pressure context. Copy the reviewed average ambient absolute pressure from the responsible schedule instead of allowing a silent conversion.
Only the total surface-gas allowance already prepared in the named responsible record. Its owner must define and review ascent, decompression, buddy/failure, reserve, contingency or other components; the worksheet cannot decide whether anything is missing.
No. It is a source-labelled arithmetic reconciliation. Use current training, operator procedures, the responsible dive plan, appropriate instruments/equipment and qualified supervision for every operational decision.
About Reviewed Dive Gas Plan Reconciliation
Use this worksheet to reconcile gas arithmetic already chosen and documented by a responsible plan owner. Copy a coherent cylinder rating pair, reviewed pressure boundary, planned segment duration, average ambient absolute pressure, combined surface-volume demand rate, externally prepared non-segment allowance and independent total-demand record. The worksheet does not choose or approve a dive profile.
