ENGINEERING UNITS CONVERTOR - READ ME

Overview

This spreadsheet provides conversions for commonly used engineering units.

The data table and lookup formulae are the same as used in all my engineering spreadsheet tools

Liability

No warrantees are made with respect to the accuracy or applicability of the calculations in this spreadsheet.

The onous is on the user to verfiy that any results obtained are correct and appropriate for the work being carrying out.

Copyright

This spreadsheet is the intellectual property of the author, Andrew Hooks.

You are free to use it and distribute it however, you may not make it available for download from any website

without prior written consent and you must not remove or obscure any notices regarding authorship. (Basically

don't steal or take credit for my work). Thanks.

Contact

email: feedback@firstprincipleseng.net

for other tools visit: www.firstprincipleseng.net

The data table and lookup formulae are the same as used in all my engineering spreadsheet tools

No warrantees are made with respect to the accuracy or applicability of the calculations in this spreadsheet.

The onous is on the user to verfiy that any results obtained are correct and appropriate for the work being carrying out.

You are free to use it and distribute it however, you may not make it available for download from any website

without prior written consent and you must not remove or obscure any notices regarding authorship. (Basically

UNIT CONVERSION

Input 2000 psig 13890.86 kPa(A)

Output 139 bara 138.9086 bara

Unit Type Input unit

Output unit

Selection

Selected Type ID 20

Selected Type Lookup Ref unitPressure

Two param equation? TRUE

Input unit ID 9

Input unit ID (min applied) 9

Output unit ID 6

Output unit ID (min applied) 6

Long NameLookup Name

AccelerationunitAcceleration

Area - largeunitAreaLarge

Area - smallunitAreaSmall

CGR unitCGR

Density unitDensity

Energy unitEnergy

Energy rateunitEnergyRate

Force unitForce

GLR unitGLR

GOR unitGOR

Heat capacityunitHeatCapacity

Heating value - massunitHeatingValMass

Heating value - volumeunitHeatingValVol

Heat transfer coefficientunitHeatTransfCoeff

Length unitLength

LGR unitLGR

Mass unitMass

Mass rate unitMassRate

Power unitPower

Pressure unitPressure

Pressure deltaunitPressureDelta

Specific heat capacityunitSpecHeatCap

Surface tensionunitSurfTension

TemperatureunitTemperature

Thermal conductivityunitThermalConductivity

Time - largeunitTimeLarge

Time - smallunitTimeSmall

Velocity unitVelocity

Viscosity - dynamicunitViscosityDyn

Viscosity - kinematicunitViscosityKin

Volume rateunitVolRate

Volume rate - actualunitVolRateAct

Volume rate - liquidunitVolRateLiq

Volume unitVolume

CONSTANTS & UNIT LOOKUP TABLES

DETAILS

Andrew Hooks www.firstprincipleseng.net

11/15/2007

Version 1

PREFIXES

Metric

Prefix long form value

m milli 0.001

c centi 0.01

k thousand 1000

M million/mega 1E+06

B billion 1E+09

T tera 1E+12

P peta 1E+15

Imperial

Prefix long form value

M thousand 1000

MM million 1E+06

BASIC CONSTANTS

Gas constant, R 8.31451 kPa.m3/(kmol.K)

Grav. accel. 9.80665 m/s2

MW (air) 28.964 kg/kmol

Standard T, P 2

Std Pressure 101.325 kPa

Std Temperature 288.15 K

Molar Volume 23.645 m3/kgmol

Common definitions for Standard T, P

Temp Abs Pres Molar Vol

K kPa m3/kgmol

0oC, 1atm 273.15 101.325 22.414 (273.15K = 0'C = 32'F; 101.325kPa = 1atm = 14.696psia)

15oC, 1atm 288.15 101.325 23.645 (288.15K = 15'C = 59'F)

60oF, 1atm 288.71 101.325 23.691 (288.71K = 60'F = 15.56'C)

0oC, 100kPa 273.15 100 22.711

15oC, 100kPa 288.15 100 23.958

60oF, 14.73psia 288.71 101.560 23.636 (100.232kPa = 14.73psia)

UNITS

Example

Click the unit cell then select required unit from the dropdown list

that appears

Length 10 in

0.254 m

0.000 mile

Temperature 15 'C

288.15 K

15 'C

Length

Base conversions

inches/foot 12 in/ft

feet/metre 3.281 ft/m

feet/mile 5280 ft/mi

Lookup table

Unit SI unit

mm = 0.001 m

cm = 0.01 m

m = 1 m

km = 1000 m

in = 0.0254 m

ft = 0.3048 m

mile = 1609.3 m

Area_small

Lookup table

Unit SI unit

mm2

= 0.000001 m2

in2

= 0.000645 m2

m2

= 1 m2

ft2

= 0.0929 m2

Area_large

Base conversions

hectare/km2 100 hct/km2 1 hectare is 100m x 100m

ft2/acre 43559.66 ft2/acre

Lookup table

Unit Metric Unit

km2

= 1 km2

mi2

= 0.6214 km2

hectare = 0.01 km2

acre = 0.0040468 km2

Volume

Base conversions

barrels/cubic meter 6.283 bbl/m3

in3/US gallon 231 in

3/gallon

Litres/Imperial(UK) gallon 4.54609 L/gallon(UK)

Lookup table

Unit SI unit

mL = 0.000001 m3

cm3

= 0.000001 m3

L = 0.001 m3

m3

= 1 m3

in3

= 1.639E-05 m3

ft3

= 0.0283 m3

(35.31 ft3/m3)

bbl = 0.1592 m3

gallon (US) = 0.00379 m3

(264.2 gallon/m3)

gallon (UK) = 0.00455 m3

(220 gallon/m3)

Mass

Base conversions

pounds/kilogram 2.20462 lbl/kg

pound/ton (short) 2000 lbl/tn

pound/ton (long) 2240 lbl/ton

Lookup table

Unit SI unit

mg = 0.000001 kg

g = 0.001 kg

kg = 1 kg

tonne (metric) = 1000 kg

lbl = 0.454 kg

ton (short) = 907.2 kg

ton (long) = 1016.0 kg

Force

Base conversions

Force = mass * acceleration

Dyn 1.00E-05 N

Lookup table

Unit SI unit

N = 1 N

mN = 0.001 N

kg(f) = 9.80665 N 1kg * gravitational acceleration

lbl(f) = 4.44823 N

Dyn = 0.00001 N

Pressure

Base conversions

Pressure is force per unit area

Pa = N/m2 = kg.(m/s

2)/m

2 = kg/(m.s

2)

kPa/Atmosphere 101.325 kPa(A)/atm(A) Atmospheric pressure at sealevel in kPa

kPa/bar 100 kPa/bar

bara/Atmosphere 1.01325 bara/atm The atmospheric pressure in bar at sealevel is 1.01325 bar

barg/Atmosphere 0 barg/atm

psia/Atmosphere 14.696 psia/atm(A) The atmospheric pressure in psi at sealevel is 14.696 psi

psi/bar 14.504 psi/bar

Lookup table

!!! Order is important - multiply first then add the constant !!!

Unit Multiplier Constant SI unit

Pa(A) 0.001 0 kPa(A)

kPa(A) 1 0 kPa(A)

kPa(G) 1 101.325 kPa(A)

MPa(A) 1000 0 kPa(A)

MPa(G) 1000 101.325 kPa(A)

bara 100 0 kPa(A)

barg 100 101.325 kPa(A)

psia 6.895 0 kPa(A)

psig 6.895 101.325 kPa(A)

atm(A) 101.325 0 kPa(A)

atm(G) 101.325 101.325 kPa(A)

kg/cm2(A) 98.0665 0 kPa(A) [kg/cm2 * (100cm/m)

2] * (grav accel) = N/m

2 = kg * (grav accel) /m

2

Pressure difference

Lookup table

Unit SI unit

Pa = 0.001 kPa

kPa = 1 kPa

mbar = 0.100 kPa

bar = 100 kPa

psi = 14.504 kPa

atm = 101.325 kPa

kg/cm2

= 98.0665 kPa

mH2O = 9.80665 kPa

Temperature

Base conversions

Constant

Deg Celcius / Kelvin 273.15oC/K

Fahrenheit 459.67 Rankine

Rankine/Kelvin 1.8 0 R/K

Lookup table

!!! Order is important - multiply first then add the constant !!!

Unit Multiplier Constant SI unit

'C 1 273.15 K

K 1 0 K

'F 0.556 255 K

R 0.556 0 K

Time_small

Lookup table

Unit SI unit

ms = 0.001 s

s = 1 s

min = 60 s

hour = 3600 s

X barg = X barg + atm P = Y bara; eg. 1barg + 1.013 = 2.013bara1 bar = 100kPa X bara = (X - 1.013)barg * 100kPa/bar + 101.3kPa/atm = X*100kPa(A) Converting to psia first would give the same result, ie.the following are equivalent:[X psig + (14.5*1.013or X psig * (100/14.5

day = 86400 s

Time_large

Lookup table

Unit "SI Unit"

hour = 0.0417 day

day = 1 day

month = 30.4 day

year = 365.25 day

Volume rate - Gas (standard conditions)

Lookup table

Select standard T, P from the in-cell drop down list

Unit Std T, P Multiplier "SI Unit"

sm3/s 15oC, 1atm 1 sm

3/s

Nm3/h 0oC, 100kPa 0.000267 sm

3/s

Mm3/d 15oC, 1atm 11.574 sm

3/s

Mscf/d 60oF, 1atm 0.000328 sm3/s

MMscf/d 60oF, 1atm 0.328 sm3/s

Bscf/y 60oF, 1atm 0.900 sm3/s

kgmol/h 0.00657 sm3/s

lbmol/h 0.00298 sm3/s

Volume rate - Gas (actual conditions)

Lookup table

Unit "SI Unit"

am3/s = 1 am

3/s

am3/h = 0.000278 am

3/s

Mm3/d = 11.574 am

3/s

Mcf/d = 0.000328 am3/s

MMcf/d = 0.328 am3/s

Volume rate - Liquid

Lookup table

Unit "SI Unit"

L/s = 1000 m3/s

L/min = 16.67 m3/s

L/h = 0.278 m3/s

L/d = 0.01157 m3/s

m3/s = 1 m

3/s

m3/h = 0.002738 m

3/s

m3/d = 1.1574E-05 m

3/s

bbl/d = 1.842E-06 m3/s

k.bbl/d = 0.00184213 m3/s

gph (US) = 1.0515E-06 m3/s gallons/hour

gpd (US) = 4.3813E-08 m3/s

gph (UK) = 1.2628E-06 m3/s

gpd (UK) = 5.2617E-08 m3/s

Liquid - Gas Ratio

Lookup table

Unit "SI unit"

m3/Mm

3= 1 m

3/Mm

3

bbl/MMscf = 5.6207 m3/Mm

3

Gas - Liquid Ratio

Lookup table

Unit "SI unit"

m3/m

3= 1 m

3/m

3

scf/bbl = 0.178 m3/m

3

Mass rate

Lookup table

Unit SI unit

kg/s = 1 kg/s

kg/h = 0.000278 kg/s

t/d = 0.011574 kg/s

t/y = 3.17E-05 kg/s

lbl/s = 0.454 kg/s

lbl/h = 5.25E-06 kg/s

Velocity

Lookup table

Unit SI unit

m/s = 1 m/s

km/h = 0.278 m/s

ft/s = 0.3048 m/s

mi/h = 0.4470 m/s

Acceleration

Lookup table

Unit SI unit

mm/s2

= 0.001 m/s2

m/s2

= 1 m/s2

km/s2

= 1000 m/s2

in/s2

= 0.025 m/s2

ft/s2

= 0.305 m/s2

mi/(h.s) = 0.447 m/s2

mi/s2

= 1609 m/s2

Density

Lookup table

Unit SI unit

g/cm3

= 1.00E-09 kg/m3

kg/m3

= 1 kg/m3

lbl/ft3

= 16.018 kg/m3

Energy

Base conversions

Joules/(kgm2/s

2) 1 J/(kgm

2/s

2)

Joules/Calorie 4.1868 J/Cal

Joules/BTU 1055.056 J/BTU

Lookup table

Unit SI unit

J = 0.001 kJ

kJ = 1 kJ

Cal = 0.0041868 kJ

kCal = 4.1868 kJ

BTU = 1.055056 kJ

Energy rate

Lookup table

Unit "SI unit"

TJ/d = 1 TJ/d

PJ/y = 1000 TJ/d

Power

Base conversions

(BTU/h) / kW 3412.1 (BTU/h)/kW

Lookup table

Unit SI unit

W = 0.001 kW

kW = 1 kW

MW = 1000 kW

Hp = 0.746 kW

BTU/h = 0.00029 kW

Heating value (volume basis)

Lookup table

Unit "SI unit"

MJ/m3

= 1 MJ/m3

MJ/kgmol = 0.042292 MJ/m3

MJ/scf = 35.315 MJ/m3

BTU/m3

= 0.001055 MJ/m3

BTU/scf = 0.037259 MJ/m3

BTU/lbmol = 0.000098 MJ/m3

kcal/lbmol = 0.000390 MJ/m3

Heating value (mass basis)

Lookup table

Unit "SI unit"

MJ/kg = 1 MJ/kg

BTU/kg = 0.00106 MJ/kg

BTU/lb = 0.00233 MJ/kg

kcal/lb = 0.00923 MJ/kg

kcal/kg = 0.00419 MJ/kg

Heat capacity

Lookup table

Unit "SI unit"

J/K = 1 J/K

BTU/'F = 1899 J/K

cal/'C = 4.187 J/K

Specific heat capacity

Lookup table

Unit "SI unit"

J/(kg.K) = 1 J/(kg.K)

J/(g.K) = 1000 J/(kg.K)

BTU/(lb'F) = 4187 J/(kg.K)

cal/(g'C) = 4187 J/(kg.K)

Thermal conductivity

Lookup table

Unit "SI unit"

W/(m.K) = 1 W/(m.K)

BTU/(h.ft'F) = 1.731 W/(m.K)

BTU.in/(h.ft2'F) = 0.144 W/(m.K)

cal/(sm'C) = 4.187 W/(m.K)

Heat transfer coefficient

Lookup table

Unit "SI unit"

W/(m2K) = 1 W/(m

2K)

BTU/(h.ft2'F) = 5.678 W/(m

2K)

cal/(s.cm2K) = 4.19E-04 W/(m

2K)

kcal/(h.m2K) = 1.163 W/(m

2K)

Dynamic (Absolute) Viscosity

Base conversions

Pa.s = 1 kg/m/s

Poise = 1 g/cm/s (Water has viscosity of ca. 1cP at 20'C (1.002))

Lookup table

Unit "SI unit"

cP = 0.001 Pa.s

Poise = 0.1 Pa.s

Pa.s = 1 Pa.s

Kinematic Viscosity Kinematic viscosity = Dynamic viscosity / Density for a Newtonian fluid

Base conversions

Stoke = 1 cm2/s

Lookup table

Unit "SI unit"

m2/s = 1 m

2/s

St = 0.0001 m2/s

cSt = 0.000001 m2/s

Surface tension

Lookup table

Unit "SI unit"

T = 1 N/m

N/m = 1 N/m

mN/m = 0.001 N/m

lbl(f)/in = 175.13 N/m

dyn/cm = 0.001 N/m

(273.15K = 0'C = 32'F; 101.325kPa = 1atm = 14.696psia)

(288.15K = 15'C = 59'F)

(288.71K = 60'F = 15.56'C)

(100.232kPa = 14.73psia)

1 hectare is 100m x 100m

(264.2 gallon/m3)

(220 gallon/m3)

1kg * gravitational acceleration

Atmospheric pressure at sealevel in kPa

The atmospheric pressure in bar at sealevel is 1.01325 bar

The atmospheric pressure in psi at sealevel is 14.696 psi

[kg/cm2 * (100cm/m)2] * (grav accel) = N/m

2 = kg * (grav accel) /m

2

X barg = X barg + atm P = Y bara; eg. 1barg + 1.013 = 2.013bara 1 bar = 100kPa --> X barg = [100*(X barg + 1.013bar/atm)] kPa(A), or = [100*X + 101.325] kPa(A)

1.013)barg * 100kPa/bar + 101.3kPa/atm = X*100kPa(A)

Converting to psia first would give the same result, ie.the following are equivalent: [X psig + (14.5*1.013=14.7)] psia * (1kPa / 14.5psi) = kPa(A)

X psig * (100/14.5=6.895) kPa(G) + 101.3 kPa/atm = kPa(A)

(Water has viscosity of ca. 1cP at 20'C (1.002))

Kinematic viscosity = Dynamic viscosity / Density for a Newtonian fluid