Units
Inputs

Type a value in any field to see all other units update live. Eight categories tuned for piping work.

Result
Results appear in each section below.
Converter
Flow rate
m³/h
m³/s
L/s
L/min
US GPM
UK GPM
bbl/day
bbl/h
CFM (ft³/min)
CFH (ft³/h)
Pressure
bar
Pa
kPa
MPa
psi
kgf/cm²
atm
mmHg / Torr
m H₂O (4°C)
in H₂O
in Hg
Dynamic viscosity
cP
Pa·s
mPa·s
poise (P)
lb/(ft·s)
lb/(ft·h)
Kinematic viscosity
cSt
m²/s
mm²/s
Stokes (St)
ft²/s
SSU (Saybolt @100°F)
Length
mm
cm
m
km
in
ft
yd
mile
Mass
kg
g
metric ton
lb
oz
short ton
long ton
Torque
N·m
kN·m
ft·lbf
in·lbf
kgf·cm
kgf·m
Density
kg/m³
g/cm³
kg/L
lb/ft³
lb/US gal
lb/in³
Temperature
°C
°F
K
°R (Rankine)
How it works

Type any value in any field. All other units in the same category recompute live. Eight categories cover what comes up most on a piping desk: flow rate, pressure, viscosity (dynamic and kinematic), length, mass, torque, density and temperature.

Notes:
  • Pressures are absolute / differential conversion factors. For gauge vs absolute, subtract or add 1.01325 bar (14.696 psi).
  • Density "lb/US gal" uses the US liquid gallon (3.7854 L), not the imperial gallon.
  • SSU (Saybolt) viscosity is provided through a separate temperature-dependent conversion and not included in this linear converter.
  • Volumetric flow conversions for gas use actual conditions. For "standard" or "normal" gas flow, multiply by the appropriate density correction.
⚠ For preliminary sizing only Results are based on nominal ASME dimensions and typical material densities. They do not account for manufacturing tolerances, coatings, supports, flanges, fittings, corrosion allowance, or actual site conditions. All final designs must be verified by a qualified engineer and validated against the applicable code edition. Piping Passion accepts no liability for decisions made using this tool.