Conventional millimetre of mercury to standard atmospheres converter
Convert conventional millimetre of mercury (mmHg) to standard atmospheres (atm).
Pressure converter
Instant conversion
Edit either value. Decimals and scientific notation supported.
1
mmHg
esc
PascalPa
KilopascalkPa
MegapascalMPa
Barbar
Millibarmbar
HectopascalhPa
Standard atmosphereatm
Pounds per square inchpsi
TorrTorr
Conventional millimetre of mercurymmHg
No units found. Try a name or symbol.
0.001315789661
atm
esc
PascalPa
KilopascalkPa
MegapascalMPa
Barbar
Millibarmbar
HectopascalhPa
Standard atmosphereatm
Pounds per square inchpsi
TorrTorr
Conventional millimetre of mercurymmHg
No units found. Try a name or symbol.
CONVERSION
1 mmHg ≈ 0.001315789661 atm
6 significant figures
10 significant figures
15 significant figures
Precision changes displayed rounding, not calculation accuracy.
FORMULAatm = mmHg × 0.0013157896611399
FORMULA & EXAMPLES
How to convert Conventional millimetre of mercury to standard atmospheres
atm = mmHg × 0.0013157896611399
Multiply the mmHg reading by 0.0013157896611399.
Worked examples
1 mmHg ≈ 0.001315789661 atm
1 × 0.0013157896611399 ≈ 0.001315789661
760 mmHg ≈ 1.000000142 atm
760 × 0.0013157896611399 ≈ 1.000000142
Frequently asked questions
Does mmHg to atm change gauge pressure into absolute pressure?
No. Unit conversion preserves the original pressure reference. Converting a gauge reading to absolute pressure additionally requires the applicable atmospheric pressure.
Conventional millimetre of mercury to standard atmospheres table
Fixed reference · Conventional millimetre of mercury to Standard atmosphere
Reference values use this page’s named pair and default context. Calculator precision and font settings do not change this table.
Conventional millimetre of mercury (mmHg)
Standard atmosphere (atm)
0
0
0.1
0.0001315789661
0.5
0.0006578948306
1
0.001315789661
2
0.002631579322
5
0.006578948306
10
0.01315789661
25
0.03289474153
50
0.06578948306
100
0.1315789661
1000
1.315789661
Table results use 10 significant figures; decimal formula coefficients use up to 15. Calculations use the unit definitions before rounding. Extra digits do not improve measurement accuracy.