Dive Toolbox vs Time to Surface

DiveToolbox — Professional dive planning and gas calculation tools for recreational and technical divers. DECOMPRESSION DIVE PLANNER Plan single-level and multi-level dives using the Bühlmann ZH-L16C algorithm with configurable gradient factors. Get detailed ascent profiles, gas switch schedules, and comprehensive safety analysis including CNS, OTU, gas density, and END monitoring. GAS BLENDING CALCULATOR Step-by-step fill instructions for Nitrox and Trimix blending. Supports partial pressure and continuous flow methods with real-time MOD calculations. MOD / EAD / END CALCULATOR Instantly calculate Maximum Operating Depth, Equivalent Air Depth, and Equivalent Narcotic Depth for any gas mix. GRADIENT FACTORS EXPLORER Visualize how GF Low and GF High affect no-decompression limits and decompression schedules. SAC RATE CALCULATOR Calculate your Surface Air Consumption rate from dive data to improve gas planning accuracy. ROCK BOTTOM CALCULATOR Determine minimum gas reserves for safe ascent, including emergency scenarios with configurable safety margins. SUCCESSIVE DIVE PLANNER Plan repetitive dives accounting for residual nitrogen and helium tissue loading from previous dives. UNIT CONVERSIONS Convert between metric and imperial units for depth, pressure, volume, and temperature. KEY FEATURES • Multi-gas support with automatic deco gas switching • Save and organize dive plans in folders • Save tank presets for quick planning • Share plans via link or QR code • Export plans as PDF • Customizable diver profile (GF, SAC, PPO2, speeds) • Dark and light themes • Available in 7 languages: English, French, German, Spanish, Italian, Polish, Russian Terms of Use: https://divetoolbox.com/en/terms Privacy Policy: https://divetoolbox.com/en/privacy

Staged decompression from 15 to 51 m (56 with a warning), on six bottom gases with one deco bottle. Runtime, stops, minimum gas and both cylinder fills, before you kit up — then your team signs it. Planning is free, with no account and no limit. WHAT IT PLANS • Six bottom gases: EAN32, triox 30/30, EAN28, air, 21/35 and 18/45, in a twinset of your choice • One decompression gas — EAN50 or oxygen — in an AL80, AL50 or AL40 • EAN50 at 21 m even when the first stop is shallower, on by default • A swim to the drop-off before the deep segments, on back gas or the deco bottle • A second deep segment, deeper or shallower than the first • Bühlmann ZH-L16C, gradient factors set per plan, 20/85 by default • ppO2 1.2 bar working by default, set per plan; 1.6 at a stop — stricter than the usual 1.4 • Descent 20 m/min; ascent 9 m/min to the first stop, 6 between stops, 1 over the last 6 m, all adjustable. Stops every 3 m, the last at 6 m • Metric or imperial THE GAS PLAN Back-gas fill and turn pressure on thirds, halves or all usable, on the ten-bar grid. Minimum gas: two divers sharing back gas to the first deco gas at 3 m/min. Fill: bottom phase with descent, plus minimum gas. Deco bottle fill and reserve from the solved schedule. CNS. If gas or CNS cannot carry the bottom time asked for, it plans the longest that fits and names the limit. THE DIVE, MINUTE BY MINUTE Each leg shows the runtime it starts and ends at. A wetnote page — schedule, gas checkpoints, on-the-fly adjustments — to copy by hand. On the fly: 5 minutes more or less, 3 m deeper or shallower, each re-solved, with the change in deco minutes and gas per cylinder. PRAGMATIC DECOMPRESSION Off by default, chosen per plan. On, each 21–9 m stop gets one time, and the 6 m stop is the longer of their sum and what the model needs: simpler to run, not more conservative. BRIEFS AND DIVE SITES A brief keeps a dive — site, depth and bottom time — free, unlimited, in your own iCloud. Sites: Dive log's known list (OpenStreetMap and reviewed submissions); add your own and submit them for review. Your divers, their SCR and your sites are shared through iCloud with every Diver.Today app. DIVES BEFORE THIS ONE Up to three earlier dives, each with its surface interval. Nitrogen and helium carry over; CNS decays at a 90-minute half-time. No published table covers repetitive deco dives; your earlier profiles run through the same model. SIGNED TEAM PLANS A plan is one brief on one date with a dive lead and divers — your buddies or names you type — frozen with every figure it printed. Each diver signs by finger on your iPhone; skip anyone not there and come back to them. Send it as a picture or a one-page PDF. Plans are free and unlimited, with the app's watermark and store line. YOUR DIVE CENTER'S BRAND The Diver.Today App Family subscription puts your logo, name, two lines and color on every plan you send, without the watermark, and your color, picture and logo across the app. $2.99 a month or $19.99 a year, each with a week free, or $49.99 once for life (US prices). It covers every Diver.Today app. WHAT IT DOES NOT PLAN Rebreathers. Cave or wreck penetration. Hypoxic mixes and their travel gas. Altitude — sea level only. OTU. More than one decompression gas, a stated limit of this release. IT REFUSES RATHER THAN WARNS A gas past its oxygen limit or a surface interval under an hour gets no numbers rather than numbers with a caution. YOUR DIVE COMPUTER OWNS THE DIVE This is pre-dive arithmetic. It passes no verdict on a dive and replaces neither training, your computer nor your judgment in the water. The planner works offline. No ads, analytics or tracking. Briefs, plans, divers and sites sync through your own iCloud; nothing about you is sent to us, and a dive site only if you submit it. iPhone, iOS 17 or later. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://diver.today/timetosurface-site/privacy.html