Scuba Tools and Calculators
Use the calculators when you want a quick number for planning. Use the PDFs when you want a checklist or reference you can keep on your phone or print for the dive site. Paid downloads link to a full description page with preview images.
Calculators
Fast planning tools for Nitrox limits, breathing rate, reserves, and weighting.
MOD & EAD Calculator
Calculate maximum operating depth and equivalent air depth for common Nitrox mixes using your PO2 limit.
RMV Calculator
Estimate your breathing rate (RMV) from a known dive so you can plan future gas needs safely and accurately.
Minimum Gas Reserve Calculator
Build a realistic reserve for two divers to ascend together from planned depth with margin.
Buoyancy and Weight Calculator
Get a defensible starting weight estimate based on suit, tank, and salt vs fresh water.
Free PDF Downloads
Printables and checklists you can take with you. Some are direct downloads, and some are delivered through the Journal.
Basic Scuba Travel Packing List
Subscribe to the Dive Otter Journal and I’ll send you my real-world packing list for warm to moderate water travel.
Travel First Aid Kit
A practical checklist for travel-focused first aid, built to help you pack intentionally without overloading
Paid PDF Downloads
Multi page packs and systems. Each link goes to a full description page with blurred preview pages so you can confirm it is what you want before you buy.
