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-rw-r--r--divelist.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/divelist.c b/divelist.c
index 85fb535ed..143f4d43c 100644
--- a/divelist.c
+++ b/divelist.c
@@ -749,8 +749,8 @@ static int calculate_sac(struct dive *dive)
}
}
}
- /* Mean pressure in bar (SAC calculations are in bar*l/min) */
- pressure = depth_to_mbar(dc->meandepth.mm, dive) / 1000.0;
+ /* Mean pressure in ATM (SAC calculations are in atm*l/min) */
+ pressure = (double) depth_to_mbar(dc->meandepth.mm, dive) / SURFACE_PRESSURE;
sac = airuse / pressure * 60 / duration;
/* milliliters per minute.. */