Dive Log Statistics Calculator

Analyze your diving history to estimate SAC rate, air consumption efficiency, experience level, and depth-to-experience safety ratio.

Inputs

Total logged dives

Total bottom time (hours)

Average depth (m)

Maximum depth (m)

Avg tank used (bar)

Tank volume (L)

Tab to move between fields

Results

Avg dive time (min)

Estimated SAC (L/min)

12.4

SAC rating (1-4)2

Depth exposure (m·hrs)720

Experience level (1-4)2

Depth exceeds experience?1

Est. dives per year50

How to Use This Calculator

Enter your total logged dive count and total bottom time in hours from your dive log.
Input your average dive depth and deepest logged depth in meters.
Enter the average tank pressure consumed per dive in bar (start minus end pressure).
Select your typical tank volume in litres (AL80 = 11.1 L is the most common).
Read Estimated SAC Rate (L/min) — excellent is below 12 L/min; above 20 L/min suggests room to improve breathing technique.
Check Experience Level and whether your max depth exceeds what is typical for your certification level.

How the result changes with Total logged dives

Total logged dives	Avg dive time (min)	Estimated SAC (L/min)
1,000	2.4	247.8
3,500	0.7	867.2
6,500	0.4	1,610.5
9,000	0.3	2,229.9

What each input means

Total logged dives: Total number of dives in your logbook.
Total bottom time (hours): Sum of all dive bottom times in hours.
Average depth (m): Your average dive depth across all logged dives.
Maximum depth (m): Deepest dive you have logged.
Avg tank used (bar): Average pressure consumed per dive (start minus end pressure).
Tank volume (L): Internal volume of your typical tank. AL80 = 11.1 L.

What each result means

Avg dive time (min): Average bottom time per dive in minutes.
Estimated SAC (L/min): Estimated Surface Air Consumption rate. Excellent <12, Good 12-16, Average 16-20, High >20.
SAC rating (1-4): 1 = Excellent, 2 = Good, 3 = Average, 4 = High consumption.
Depth exposure (m·hrs): Cumulative depth × time exposure metric.
Experience level (1-4): 1 = Beginner (<30 dives), 2 = Intermediate (30-100), 3 = Advanced (100-500), 4 = Expert (500+).
Depth exceeds experience?: 1 = your max depth exceeds typical for your experience level.
Est. dives per year: Estimated annual dive frequency.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Total logged dives = 50, Total bottom time (hours) = 40, Average depth (m) = 18, Maximum depth (m) = 35 = 6 input(s) provided
Calculate Avg dive time
48 = 48
Calculate Estimated SAC
Estimated SAC = avgDiveTimeMin > 0
12.4 = 12.4
Calculate SAC rating
SAC rating
2 = 2
Calculate Depth exposure
Depth exposure = avgDepthM * totalBottomTimeHrs
720 = 720

Engine last updated July 28, 2026. Checked against 3 independently-derived tests — how we verify calculators.

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