Diving Unit Converter

Unit Conversions — Key Features

• Depth conversion — meters ↔ feet
• Pressure conversion — bar ↔ PSI
• Temperature conversion — Celsius ↔ Fahrenheit
• Volume conversion — liters ↔ cubic feet
• Weight conversion — kilograms ↔ pounds
• Speed conversion — m/min ↔ ft/min

Unit Conversions — How It Works

Enter a value in either unit and the conversion appears instantly. Six categories cover every unit a diver routinely encounters: depth (meters ↔ feet), pressure (bar ↔ PSI), temperature (Celsius ↔ Fahrenheit), volume (litres ↔ cubic feet, useful for cylinder sizing), weight (kg ↔ lb), and gas density. The conversions matter most when you cross between metric and imperial gear or dive somewhere unfamiliar: a US-made cylinder is labelled in cubic feet at a service pressure in PSI, while European tanks are litres at bar. A 15-litre steel at 232 bar holds roughly 122 cubic feet of usable gas — knowing the equivalence prevents miscalculating SAC, redundancy, and turn pressures. All six panels live on one page for quick reference, with both directions visible side-by-side and values updating as you type, so you never need to mentally juggle 32.8 feet per 10 metres or 14.5 PSI per bar mid-brief.

Why Use Our Unit Converter?

• All dive-relevant conversions in one place
• Instant results with no page reloads
• Designed specifically for scuba diving units
• Works on any device — phone, tablet, or desktop

Unit Conversions — Frequently Asked Questions

What units can I convert?

DiveToolbox converts every unit a diver routinely encounters across six categories: depth (metres ↔ feet), pressure (bar ↔ PSI ↔ atm), temperature (Celsius ↔ Fahrenheit), volume (litres ↔ cubic feet), weight (kilograms ↔ pounds), and gas density (g/L for the density calculator and reading foreign manuals). All six panels live on one page for quick reference, with both directions visible side-by-side and values updating as you type — useful on the boat or in the parking lot before a dive when you need fast answers and have no signal.

Is this converter free?

Yes — every unit conversion on DiveToolbox is free with no usage limits. The freemium model only paywalls planning tools that save data or compute multi-step plans (Dive Planner, blending, successive dives, saved tank profiles). Single-equation conversions like metres-to-feet or bar-to-PSI are instant answers a diver needs constantly, so they remain free along with MOD, EAD, END, gradient factors, gas density, ICD, SAC, and Rock Bottom calculations.

Why a dive-specific converter?

Generic unit converters often round, drop precision needed for gas calculations, or use approximate factors. DiveToolbox uses the precise conversions divers actually need: 1 m = 3.28084 ft, 1 bar = 14.5038 PSI, 1 L = 0.0353147 ft³, and so on. Volume conversions for cylinders use absolute water capacity (litres) rather than the imperial 'cubic feet at service pressure' convention, with a separate converter to translate between the two. This avoids the classic error of computing SAC in the wrong unit system.

Does it support both metric and imperial systems?

Yes — every panel converts in both directions and supports both unit systems. The intended use case is exactly mixed-system gear: European divers booking a trip in the US (everything in feet/PSI/cubic feet), American divers using metric dive computers, or instructors teaching students on borrowed gear from a different region. A 15-litre steel cylinder at 232 bar holds roughly 122 cubic feet of gas — knowing the equivalence prevents miscalculating SAC, redundancy, and turn pressures across the metric/imperial boundary.

Are the conversion formulas accurate for diving?

Yes — all conversion factors are scientific constants verified against NIST and ISO 80000 references, with full precision (no rounding to 2 decimals like consumer apps). For diving the critical conversions are depth (used in MOD/EAD/END), pressure (gauge reading vs absolute), and gas volume (cylinder capacity × pressure). Errors in any of these propagate directly into gas-planning numbers — a 10% error in litres-to-cubic-feet means a 10% error in Rock Bottom — so we keep precision tight and document the formulas explicitly.

Can I use the converter on my phone?

Yes — DiveToolbox runs in any modern browser including iOS Safari and Android Chrome, and the conversion page is laid out for one-handed use on a small screen. Native apps for iOS and Android are also available on the App Store and Google Play if you prefer offline access — the conversions work without an internet connection because all the math is local. The app is sized to be readable in bright sunlight on a dive boat, with high-contrast colour modes that switch automatically with system preference.

→ Diving Glossary — Essential acronyms and concepts every diver should know

→ Imperial vs Metric Units in Diving: Practical Guide — How to read, convert and decide between US-imperial and SI-metric dive gear when travelling