# Depthlog > Log, analyze, and share your diving adventures with Depthlog. Improve your diving and connect with fellow divers. Comprehensive dive logging, beautiful statistics, advanced dive computers and lifetime access for scuba divers of all levels. ## Pricing 100% free - no subscription required. Full access to all features forever at no cost. ## Use Cases **Recreational Divers**: Track your diving journey, set personal goals, and share memorable dives with the diving community. Perfect for vacation divers who want to remember every underwater adventure. **Professional Divers**: Maintain comprehensive dive records required for professional work, track continuing education, and easily verify credentials with dive centers worldwide. **Dive Instructors**: Manage student records, track certification progress, and maintain your own professional dive history all in one place. **Travel Divers**: Access your certifications and dive history from anywhere in the world. No more forgotten certification cards or lost logbooks on dive trips. **Data-Driven Divers**: Analyze your diving patterns, optimize air consumption, track depth trends, and improve your diving performance with detailed analytics. **Dive Centers and Resorts**: Verify customer certifications, review dive history, and streamline check-in processes with digital credential verification. ## Free diving computers and calculators Advanced scuba diving calculators and interactive tables to plan your dives safely. All tools are completely free to use, no account required. - [SAC Calculator](/computers/sac): Calculate your Surface Air Consumption rate to optimize air management and plan safer dives with more accurate gas consumption estimates. - [Dive Time and Autonomy Calculator](/computers/autonomy): Calculate how long you can stay underwater at a given depth based on your SAC rate and tank size. Essential for planning safe dive profiles. - [Tank Autonomy Calculator](/computers/tank-autonomy): Calculate how long your scuba tank will last at a given depth based on your tank volume, initial pressure, and SAC rate. Perfect for quick dive planning. - [Weight Calculator](/computers/weight): Determine your optimal weighting for proper buoyancy control. Enter your gear and body composition to get personalized weight recommendations. - [Best Nitrox Mix Calculator](/computers/best-nitrox-mix): Find the optimal Nitrox mixture for your target depth to maximize bottom time while maintaining safe oxygen exposure limits. - [Nitrox NDL and MOD Calculator](/computers/nitrox): Explore No Decompression Limits and Maximum Operating Depths for all Nitrox mixtures. Plan Nitrox dives with confidence using our interactive calculator. - [Nitrox No Decompression Limits Table](/resources/no-decompression-limits-table): Interactive reference table showing NDLs for standard air and EAN mixes from EAN22 to EAN40 at various depths. - [Nitrox Maximum Operating Depth Table](/resources/maximum-operating-depth): Complete MOD reference table for all Nitrox mixtures. Essential for safe Nitrox diving planning and oxygen exposure management. - [Equivalent Air Depth Calculator](/computers/equivalent-air-depth): Calculate the equivalent air depth for any Nitrox mixture to use standard air decompression tables. Essential for planning Nitrox dives with traditional planning methods. - [Nitrogen Narcosis Calculator](/computers/nitrogen-narcosis): Estimate the effects of nitrogen narcosis at depth based on your breathing gas and experience level. Understand the risks of deep diving with nitrogen accumulation. - [CNS Oxygen Clock](/computers/cns-oxygen-clock): Track your cumulative oxygen exposure during Nitrox dives. Monitor CNS toxicity limits to ensure safe oxygen exposure across multiple dives. - [Repetitive Dive and Surface Interval Calculator](/computers/repetitive-dive): Plan consecutive dives with Residual Nitrogen Time (RNT), pressure groups and surface interval credit for air and Nitrox to stay within no-decompression limits. - [Minimum Gas and Rock Bottom Calculator](/computers/minimum-gas): Calculate your rock bottom turn pressure and the minimum gas required to ascend safely with your buddy, including problem-solving time, ascent and safety stop. - [Nitrox Blending Calculator](/computers/nitrox-blending): Blend any Nitrox (EAN) mix with partial pressure or continuous blending. Compute oxygen and air to add and the resulting Maximum Operating Depth. ## Public Diver Profiles Browse public diver profiles and discover diving statistics from the community. View dive counts, total time underwater, deepest dives, certifications, and dive locations shared by other Depthlog users. ## Affiliate Program Earn commissions by referring new divers to Depthlog. Join our affiliate program and help scuba diving enthusiasts discover the best free dive logging platform. Commission earned per referred user. - [Affiliate Program](/affiliate): Learn how to join our affiliate program and start earning commissions by sharing Depthlog with fellow divers. - [Affiliate Agreement](/docs/affiliate-agreement): Read the full terms and conditions of the Depthlog affiliate program. ## Scuba Diving Blog and Learning Resources Read Depthlog's blog to learn scuba diving tips and tricks, discover new dive destinations, safety checklists, and equipment recommendations. Elevate your diving skills to the next level. - [Digital Dive Log Revolution: The Complete Guide to Modern Scuba Diving Documentation](https://depthlog.net/raw/learn/digital-logbook-revolution.md): Discover how modern dive logging technology is transforming the way scuba divers document their underwater adventures. Learn about comprehensive digital solutions for managing dive logs, certifications, and connecting with the diving community - [Dive computer Aqualung: Export dive logs and migrate to Depthlog](https://depthlog.net/raw/learn/dive-computer-aqualung-export.md): Export your dive logs from Aqualung dive computers. Learn easy methods to transfer your dive data to DepthLog - [Dive computer Cressi: Export dive logs and migrate to Depthlog](https://depthlog.net/raw/learn/dive-computer-cressi-export.md): Export your dive logs from Cressi dive computers. Learn easy methods to transfer your dive data to DepthLog - [Dive computer Garmin: Export dive logs and migrate to Depthlog](https://depthlog.net/raw/learn/dive-computer-garmin-export.md): Export your dive logs from Garmin dive computers. Learn easy methods to transfer your dive data to DepthLog - [Dive computer Mares: Export dive logs and migrate to Depthlog](https://depthlog.net/raw/learn/dive-computer-mares-export.md): Export your dive logs from Mares dive computers. Learn easy methods to transfer your dive data to DepthLog - [Dive computer Scubapro: Export dive logs and migrate to Depthlog](https://depthlog.net/raw/learn/dive-computer-scubapro-export.md): Export your dive logs from Scubapro dive computers. Learn easy methods to transfer your dive data to DepthLog - [Dive computer Suunto: Export dive logs and migrate to Depthlog](https://depthlog.net/raw/learn/dive-computer-suunto-export.md): Export your dive logs from Suunto dive computers. Learn easy methods to transfer your dive data to DepthLog - [Analyze scuba dive logs: improve air consumption, depth & time for skill mastery](https://depthlog.net/raw/learn/how-to-analyze-your-scuba-dive-logs.md): Unlock advanced diving performance by analyzing your scuba dive logs. Learn how to meticulously track and optimize air consumption, depth profiles, and dive times to significantly improve your underwater skills and safety. - [How to compute true Surface Air Consumption in Scuba Diving: The Correct Approach](https://depthlog.net/raw/learn/how-to-compute-true-sac.md): Master your scuba diving air consumption with our scientific guide to computing True SAC. Learn methods, improve dive planning, and enhance safety with advanced analytics. - [How to start Scuba Diving: Certification Levels From Beginner to Pro, Complete Guide](https://depthlog.net/raw/learn/how-to-start-scuba-diving-certifications-guide.md): Discover the complete pathway from Open Water to Instructor with our comprehensive guide to scuba certification levels. Compare PADI, SSI, and NAUI programs, understand costs and timelines, and learn which certification unlocks your dream dive experiences - [Nitrox Diving: benefits, certification, MOD & advanced dive analytics](https://depthlog.net/raw/learn/nitrox-scuba-diving-overview.md): Master Nitrox diving: understand extended bottom times, reduced MOD, oxygen toxicity, and certification. Explore how Depthlog's advanced analytics enhance your Nitrox dive planning and safety. - [The Ultimate Scuba Diving Safety Checklist: Pre-Dive Checks for Every Dive Type](https://depthlog.net/raw/learn/scuba-diving-complete-safety-checklist.md): Never skip a step! Our complete guide covers the essential scuba diving safety checklist (BWRAF & buddy checks) PLUS specific pre-dive checks for night, deep, wreck, drift & cold water diving. Dive safer! - [What Scuba Diving Equipment Do I Need? Complete Guide for Beginners (2025)](https://depthlog.net/raw/learn/scuba-diving-equipment-beginners-guide.md): Confused about what scuba diving equipment you need? Our complete guide explains everything from BCDs to regulators in simple terms. Perfect for beginners planning their first dive! - [Scuba Diving Logbook Guide: Take Your Diving Journey to the Next Level](https://depthlog.net/raw/learn/scuba-diving-logbook-guide.md): Discover how modern dive logging is transforming the way divers track, analyze, and share their underwater adventures