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SAC Calculator
Calculate your surface-equivalent gas consumption based on real dive data.
- Input average depth and dive time
- Use cylinder size and pressure used
- Get your SAC/RMV in L/min instantly
- Track and improve gas efficiency
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Scuba gas planning toolkit
Plan Smarter.
Dive Safer.
NordTek Dive Planner helps you estimate gas needs, calculate SAC/RMV, check MOD limits and prepare safer recreational dives with confidence.
β Practical. Simple. Reliable.
Built for quick dive planning
Start with the essentials: calculate consumption, estimate required gas, and check oxygen exposure limits.
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Gas Planner
Estimate gas required for a planned recreational dive profile.
- Estimate gas required for the dive
- Set reserve pressure and safety margin
- Choose common cylinder presets
- See remaining gas at a glance
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Single Cylinder Planning
Simple recreational planning with one cylinder.
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Reserve Checks
Keep reserve pressure visible while planning.
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Common Presets
AL80, 10L, 12L and 15L starting points.
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MOD Labels
Generate clean MOD labels for gas mixes.
Why NordTek?
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Fast Calculations
Get answers quickly so you can focus on the dive plan, not the math.
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Clear Safety Focus
Conservative defaults, warnings and explanations keep safety visible.
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Made for Divers
Practical tools for everyday recreational planning and future technical features.
Coming Soon
NordTek will grow step by step without making the current tools harder to use.
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Tec Mode
Advanced settings for technical diving workflows.
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Multi-Gas Switching
Plan and track gas switches during the dive.
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END / EAD
More gas mix planning calculations.
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Advanced Dive Planning
Multi-segment profiles and deeper planning tools.
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NordTek Dive Planner is a practical planning aid for scuba divers.
It is not a substitute for proper training, experience, agency standards, gas analysis, dive computers or sound judgment. You are responsible for your own dive decisions.
Open Dive Planner
Use the current NordTek v1.4 Beta tools below. The homepage design is now separate from the working calculator area.
Cylinder Volume
L
Starting Pressure
BAR
Ending Pressure
BAR
Dive Time
MIN
Average Depth
?
M
Don't know your average depth?
Use a SAC Test Dive:
- Descend to a constant depth (10β15m recommended).
- Swim normally for 10β15 minutes.
- Record your start pressure, end pressure, dive time and depth.
- Enter that depth as your Average Depth.
Because the depth remains constant, that depth can be used as your average depth, producing a more accurate gas consumption rate.
Your Gas Consumption Rate
βL/min
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Surface Air Consumption β the amount of gas you'd use per minute at the surface. SAC = (Pressure Used Γ Cylinder Volume) Γ· (Time Γ ATA)
Plan your recreational dive gas needs. Enter your cylinder setup and dive profile β NordTek
calculates gas required, end pressure, reserve and safety margin.
Cylinder Volume
L
Cylinder Fill Pressure
BAR
Planned Maximum Depth
M
Note: Gas consumption increases with depth due to increased ambient pressure. For safety, gas planning should be based on your planned maximum depth rather than your average depth. This provides a more conservative estimate and helps maintain adequate reserves for ascent, safety stops and unexpected delays.
Planned Dive Time
MIN
Minimum Reserve Pressure (50 bar recommended)
BAR
Your Gas Consumption Rate ?Calculate yours βΊ
L/MIN
β
β
Gas Required
β
Usable Gas
β
End Pressure
β
Safety Margin
β
Reserve Remaining
β
How is Gas Required calculated?
Gas Required = SAC Γ ATA Γ Time
Gas consumption increases with depth because ambient pressure increases. ATA accounts for this effect when calculating gas requirements.
Calculate Maximum Operating Depth based on gas mix and PPOβ limit.
Gas Type
Oβ Percentage
%
PPOβ Limit
Why does NordTek use PPOβ 1.4 as standard?
PPOβ means partial pressure of oxygen. A higher PPOβ increases oxygen exposure and oxygen toxicity risk.
Many training agencies use a PPOβ of 1.4 as a working limit because it provides a balance between operational depth and oxygen exposure risk while still allowing practical dive planning.
NordTek uses 1.4 as the standard working limit because it is commonly used by many recreational and technical diving agencies for the active part of a dive.
Some divers use 1.2 or 1.3 for a more conservative plan, especially for deeper dives, cold water, stress, workload or longer exposure.
A PPOβ of 1.6 is often treated as a contingency or decompression limit, not a normal working limit.
Always follow your training, agency standards, gas analysis procedures and dive computer settings.
Maximum Operating Depth
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m
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MOD Label
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Maximum Operating Depth
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PPOβ Limit
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Analyzed Oβ
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Date: __________ Initials: __________
MOD calculations are for planning support only. Always follow your training, agency limits, gas analysis procedures and dive computer settings.
SAC vs RMV β What's the difference?
SAC and RMV are often used interchangeably. NordTek calculates surface-equivalent gas consumption in L/min, which is technically RMV-style, but βSAC Calculatorβ is the familiar recreational diving term.
About NordTek Dive Planner
NordTek Dive Planner is a free scuba diving planning tool designed to help divers estimate gas requirements, reserve volumes, and dive logistics. Whether you're planning a recreational dive or preparing for more advanced dives, the planner provides quick calculations to support safer dive planning.
Features include gas consumption estimates, SAC/RMV-based planning, cylinder pressure calculations, and reserve gas planning. Always verify dive plans using proper training, dive computers, and established safety procedures.
Coming Soon...
- Advanced Dive Planning
- Technical Diving Mode
- Multi-Gas Planning
- MOD/END/EAD
- Imperial Units