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Conversion Factors
C-1Copyright © 2007 Water Environment Federation.
C-2 Operation of Municipal Wastewater Treatment Plants
Copyright © 2007 Water Environment Federation.
Tab
le 1
.C
onve
rsio
n fr
om c
usto
mar
y to
met
ric
unit
s (i
n al
phab
etic
al o
rder
).
Mu
ltip
ly C
ust
omar
y U
nit
Ab
bre
viat
ion
By
To
Ob
tain
Met
ric
Un
it
acre
ac4.
047
�10
3m
2
0.40
4 7
ha (
hect
are)
acre
-foo
tac
-ft
1233
m3
atm
osph
ere
atm
101.
3kP
a (k
ilopa
scal
)ba
rba
r10
0.0
kPa
Bri
tish
ther
mal
uni
tB
tu1.
055
kJ (
kilo
joul
e)B
riti
sh th
erm
al u
nits
per
cub
ic f
oot
Btu
/cu
ft
37.2
6kJ
/m
3
Bri
tish
ther
mal
uni
ts p
er g
allo
nB
tu/
gal
278.
7kJ
/m
3
0.27
8 7
kJ/
LB
riti
sh th
erm
al u
nits
per
hou
rB
tu/
hr0.
2931
W (
wat
t)B
riti
sh th
erm
al u
nits
per
hou
r pe
r sq
uare
foo
tB
tu/
hr/
sq f
t3.
155
J/m
2 �sB
riti
sh th
erm
al u
nits
per
pou
ndB
tu/
lb2.
326
kJ/
kgB
riti
sh th
erm
al u
nits
per
ton
Btu
/to
n1.
163
J/kg
calo
rie
inte
rnat
iona
lca
l4.
187
J (jo
ule)
15°C
4.18
6J
20°C
4.18
2J
calo
ries
per
sec
ond
cal/
sec
4.18
7W
cent
ipoi
secP
1.00
0 �
10�
3Pa
�scu
bic
feet
per
gal
lon
cu f
t/ga
l7.
482
m3 /
m3
7.48
2 �
10�
3m
3 /L
cubi
c fe
et p
er h
our
cfh
or c
u ft
/hr
7.86
7 �
10�
6m
3 /s
7.86
7 �
10�
3L
/s
cubi
c fe
et p
er h
our
per
squa
re f
oot
cfh/
sq f
t8.
467
�10
�5
m3 /
m2 �s
304.
8L
/m
2 �hcu
bic
feet
per
mill
ion
gallo
nscu
ft/
mil.
gal
7.48
2m
L/
m3
cubi
c fe
et p
er m
inut
ecf
m o
r cu
ft/
min
4.71
9 10
�4
m3 /
s0.
471
9L
/s
cubi
c fe
et p
er m
inut
e pe
r fo
otcf
m/
ft1.
549
L/
m �
scu
bic
feet
per
min
ute
per
thou
sand
cub
ic f
eet
cfm
/10
00 c
u ft
1.66
7 �
10�
2L
/m
3 �scu
bic
feet
per
min
ute
per
thou
sand
gal
lons
cfm
/10
00 g
al0.
124
7L
/m
3 �s
Conversion Factors C-3
Copyright © 2007 Water Environment Federation.
cubi
c fe
et p
er p
ound
cu f
t/lb
6.24
3 �
10�
2m
3 /kg
cubi
c fe
et p
er s
econ
dcf
s2.
832
�10
�2
m3 /
s28
.32
L/
scu
bic
feet
per
sec
ond
per
acr
ecf
s/ac
6.99
7 �
10�
6m
3 /m
2 �s69
.97
L/
ha�s
cubi
c fe
et p
er s
econ
d p
er s
quar
e m
ilecf
s/sq
mile
1.09
3 �
10�
8m
3 /m
2 �s0.
109
3L
/ha
�scu
bic
foot
cu f
t2.
832
�10
�2
m3
28.3
2L
cubi
c in
chcu
in.
16.3
9 �
10�
6m
3
16.3
9m
Lcu
bic
yard
cu y
d0.
764
6m
3
deg
rees
Fah
renh
eit
°F0.
555
6(°F
�32
)°C
(d
egre
es C
elsi
us)
Ran
kine
°R0.
555
6K
(K
elvi
n)fe
et o
f he
adft
0.30
4 8
mfe
et p
er h
our
ft/
hr8.
467
�10
�5
m/
sfe
et p
er m
inut
eft
/m
in o
r fp
m5.
080
mm
/s
feet
per
sec
ond
ft/
sec
or f
ps0.
304
8m
/s
feet
per
sec
ond
squ
ared
ft/
sec2
0.30
4 8
m/
s2
feet
per
yea
rft
/yr
0.30
4 8
m/
a (m
eter
s pe
r an
num
)fo
otft
0.30
4 8
mfo
ot-h
ead
ft-h
ead
2989
Pafo
ot-p
ound
ft-l
b1.
356
N�m
foot
-pou
nds
per
inch
ft-l
b/in
.53
.38
J/m
foot
-pou
nds
per
min
ute
ft-l
b/m
in2.
259
�10
�2
Wfo
ot-p
ound
s pe
r se
cond
ft-l
b/se
c1.
355
Wga
llon
gal
3.78
5 �
10�
3m
3
3.78
5L
gallo
ns p
er d
aygp
d4.
381
�10
�5
L/
s3.
785
�10
�3
m3 /
dga
llons
per
day
per
acr
egp
d/
ac1.
083
�10
�11
m3 /
m2 �s
1.08
3 �
10�
8L
/m
2 �s9.
353
L/
ha�d
gallo
ns p
er d
ay p
er c
apit
agp
d/
cap
3.78
5L
/ca
p�d
C-4 Operation of Municipal Wastewater Treatment Plants
Copyright © 2007 Water Environment Federation.
Tab
le 1
.C
onve
rsio
n fr
om c
usto
mar
y to
met
ric
unit
s (i
n al
phab
etic
al o
rder
) (c
onti
nued
).
Mu
ltip
ly C
ust
omar
y U
nit
Ab
bre
viat
ion
By
To
Ob
tain
Met
ric
Un
it
gallo
ns p
er d
ay p
er li
near
foo
t gp
d/
ft1.
437
�10
�7
m3 /
m�s
1.43
7 �
10�
4L
/m
�s1.
242
�10
�2
m3 /
m�d
gallo
ns p
er d
ay p
er f
oot o
f m
anho
le d
iam
eter
gp
d/
ft/
ft-h
ead
4.07
4 �
104
(mL
/m
�d)/
mpe
r fo
ot-h
ead
gallo
ns p
er d
ay p
er in
ch o
f d
iam
eter
per
mile
gpd
/in
. dia
/m
ile92
.60
(mL
/m
�d)/
mga
llons
per
day
per
mile
gpd
/m
ile2.
720
�10
�11
m3 /
m�s
2.35
2m
L/
m�d
gallo
ns p
er d
ay p
er s
quar
e fo
otgp
d/
sq f
t4.
715
�10
�7
m3 /
m2 �s
or
m/
s4.
074
�10
�2
m3 /
m2 �d
or
m/
d40
.74
L/
m2 �d
gallo
ns p
er d
ay p
er th
ousa
nd s
quar
e fe
etgp
d/
1000
sq
ft4.
074
�10
�2
L/
m2 �d
gallo
ns p
er h
our
gph
1.05
1 �
10�
6m
3 /s
1.05
1m
L/
sga
llons
per
hou
r pe
r fo
ot o
f d
iam
eter
per
foo
t-he
adgp
h/ft
dia
/ft
-hea
d11
.32
(mL
/m
�s)/
mga
llons
per
hou
r pe
r in
ch d
iam
eter
per
thou
sand
feet
gph/
in. d
ia/1
000
ft48
8.9
(mL
/m�h
)/m
gallo
ns p
er m
illio
n ga
llons
gal/
mil.
gal
1.00
0m
L/
m3
gallo
ns p
er m
inut
egp
m6.
308
�10
�5
m3 /
s6.
308
�10
�2
L/
s5.
451
m3 /
dga
llons
per
min
ute
per
acre
gpm
/ac
0.15
5 8
L/
ha�s
gallo
ns p
er m
inut
e pe
r cu
bic
foot
gpm
/cu
ft
2.22
8L
/m
3 �sga
llons
per
min
ute
per
foot
gpm
/ft
2.07
0 �
10�
4m
3 /m
�s0.
207
0L
/m
�sga
llons
per
min
ute
per
squa
re f
oot
gpm
/sq
ft
6.79
1 �
10�
4m
/m
�s0.
679
1L
/m
2 �s58
.67
m3 /
m2 �d
gallo
ns p
er p
ound
gal/
lb83
44m
L/
kgga
llons
per
ton
gal/
ton
4.17
3m
L/
kggr
ain
gr64
.80
mg
grai
ns p
er g
allo
ngr
/ga
l17
.12
g/m
3
17.1
2m
g/L
hect
are
ha1.
000
�10
4m
2
hors
epow
erhp
0.74
5 7
kWho
rsep
ower
-hou
rhp
-hr
2.68
5M
Jho
rsep
ower
-hou
rs p
er p
ound
hp-h
r/lb
5.91
9M
J/kg
hors
epow
er-h
ours
per
thou
sand
cub
ic f
eet
hp-h
r/10
00 c
u ft
26.3
4W
/m
3
hors
epow
er-h
ours
per
thou
sand
gal
lons
hp-h
r/10
00 g
al0.
710
3kJ
/L
hors
epow
er-h
ours
per
thou
sand
pou
nds
hp-h
r/10
00 lb
5.91
9kJ
/kg
hors
epow
er p
er g
allo
n pe
r m
inut
ehp
/gp
m11
.82
MJ/
m3
11.8
2kJ
/L
hors
epow
er p
er m
illio
n ga
llons
hp/
mil.
gal
0.19
7W
/m
3
1.97
0 �
10�
4W
/L
hors
epow
er p
er th
ousa
nd g
allo
nshp
/10
00 g
al0.
197
kW/
m3
inch
in.
25.4
0m
min
ches
of
wat
erin
. H2O
0.24
8 8
kPa
inch
es o
f m
ercu
ryin
. Hg
3.37
7kP
ain
ches
per
foo
tin
./ft
8.33
3%
inch
es p
er h
our
in./
hr25
.40
mm
/h
inch
es p
er y
ear
in./
yr25
.40
mm
/a
(mill
imet
ers
per
annu
m)
kilo
wat
t-ho
urkW
h3.
600
MJ
kilo
wat
t-ho
urs
per
day
kWh/
d41
.67
Wki
low
att-
hour
s pe
r ga
llon
kWh/
gal
951.
1M
J/m
3
0.95
1 1
MJ/
Lki
low
att-
hour
s pe
r m
illio
n ga
llons
kWh/
mil.
gal
951.
1J/
m3
0.95
1 1
J/L
kilo
wat
t-ho
urs
per
poun
dkW
h/lb
7.93
6M
J/kg
kilo
wat
t-ho
urs
per
thou
sand
pou
nds
kWh/
1000
lb7.
936
kJ/
kgki
low
att-
hour
s pe
r to
nkW
h/to
n3.
969
kJ/
kgki
pki
p4.
448
kN (
kilo
new
ton)
kip-
feet
kip-
ft1.
356
kN�m
kip-
feet
per
sec
ond
kip-
ft/
sec
1.35
6kN
�m/
ski
ps p
er f
oot
kip/
ft14
.59
kN/
mki
ps p
er s
quar
e fo
otki
p/sq
ft
47.8
8kP
a
Conversion Factors C-5
Copyright © 2007 Water Environment Federation.
Tab
le 1
.C
onve
rsio
n fr
om c
usto
mar
y to
met
ric
unit
s (i
n al
phab
etic
al o
rder
) (c
onti
nued
).
Mu
ltip
ly C
ust
omar
y U
nit
Ab
bre
viat
ion
By
To
Ob
tain
Met
ric
Un
it
mic
ron
�1.
000
�m
mil
mil
25.4
0�
mm
ilem
ile1.
609
kmm
iles
per
hour
mph
0.44
6 9
m/
s1.
609
km/
hm
illio
n ga
llons
mil.
gal
3.78
5 �
103
m3
3.78
5M
Lm
illio
n ga
llons
per
day
mgd
4.38
3 �
10�
2m
3 /s
43.8
3L
/s
3.78
5 �
103
m3 /
d3.
785
ML
/d
mill
ion
gallo
ns p
er d
ay p
er a
cre
mgd
/ac
1.08
3 �
10�
5m
3 /m
2 �s9.
353
�10
3m
3 /ha
�d9.
353
ML
/ha
�dm
ost p
roba
ble
num
ber
per
hund
red
mill
ilite
rsM
PN/
100
mL
10.0
0M
PN/
Lpa
rts
per
billi
onpp
b1.
00 (
app.
)�
g/L
1.00
0�
g/kg
part
s pe
r m
illio
npp
m1.
00 (
app.
)m
g/L
1.00
0m
g/kg
poun
d (
forc
e)lb
f4.
448
Npo
und
(m
ass)
lb0.
453
6kg
poun
d-f
oot
lb-f
t1.
356
N�m
poun
d-f
eet p
er s
econ
dlb
-ft/
sec
1.35
6N
�m/
spo
und
s pe
r d
ay p
er c
apit
alb
/d
/ca
p0.
453
6kg
/ca
p�d
poun
ds
per
cubi
c fo
otlb
/cu
ft
16.0
2kg
/m
3
poun
ds
per
thou
sand
cub
ic f
eet
lb/
1000
cu
ft16
.02
g/m
3
poun
ds
per
cubi
c ya
rdlb
/cu
yd
0.59
3 3
kg/
m3
poun
ds
per
day
lb/
d5.
250
mg/
s0.
453
6kg
/d
C-6 Operation of Municipal Wastewater Treatment Plants
Copyright © 2007 Water Environment Federation.
poun
ds
per
day
per
acr
elb
/d
/ac
0.11
2 1
g/m
2 �dpo
und
s pe
r d
ay p
er a
cre-
foot
lb/
d/
ac-f
t0.
367
7g/
m3 �d
poun
ds
per
day
per
cub
ic f
oot
lb/
d/
cu f
t16
.02
kg/
m3 �d
poun
ds
per
day
per
pou
ndlb
/d
/lb
11.5
7m
g/kg
�spo
und
s pe
r d
ay p
er s
quar
e fo
otlb
/d
/sq
ft
56.5
1m
g/m
2 �s4.
882
kg/
m2 �d
poun
ds
per
day
per
thou
sand
cub
ic f
eet
lb/
d/
1000
cu
ft1.
602
�10
�2
kg/
m3 �d
poun
ds
per
day
per
thou
sand
squ
are
feet
lb/
d/
1000
sq
ft4.
882
g/m
2 �dpo
und
s pe
r fo
otlb
/ft
1.48
8kg
/m
poun
ds
per
foot
per
foo
t of
dia
met
erlb
/ft
/ft
dia
47.8
8(N
/m
)/m
poun
ds
per
gallo
nlb
/ga
l0.
119
8kg
/L
poun
ds
per
hour
lb/
hr1.
260
�10
�4
kg/
s0.
453
6kg
/h
poun
ds
per
hour
per
squ
are
foot
lb/
hr/
sq f
t4.
882
kg/
m2 �h
1.35
6 g/
m2 �s
poun
ds
per
hour
per
cub
ic f
oot
lb/
hr/
cu f
t4.
450
�10
�6
kg/
L�s
16.0
2 kg
/m
3 �hpo
und
s pe
r m
illio
n ga
llons
lb/
mil.
gal
0.11
9 8
g/m
3
0.11
9 8
mg/
Lpo
und
s pe
r po
und
lb/
lb10
00g/
kgpo
und
s pe
r sq
uare
foo
t (m
ass
dos
e)lb
/sq
ft
4.88
3kg
/m
2
poun
ds
per
squa
re f
oot (
forc
e)lb
/sq
ft
47.8
8Pa
poun
ds
per
squa
re in
ch (
forc
e)ps
i68
95Pa
poun
ds
per
thou
sand
cub
ic f
eet
lb/
1000
cu
ft16
.02
g/m
3
poun
ds
per
thou
sand
gal
lons
lb/
1000
gal
0.11
9 8
g/m
3
poun
ds
per
ton
lb/
ton
0.50
0g/
kgpo
und
s pe
r ye
ar p
er a
cre
lb/
yr/
ac1.
121
kg/
ha�a
poun
ds
per
year
per
cub
ic f
oot
lb/
yr/
cu f
t16
.02
kg/
m3 �a
poun
ds
per
year
per
squ
are
foot
lb/
yr/
sq f
t4.
882
kg/
m2 �a
poun
d-s
econ
ds
per
squa
re f
oot
lb-s
ec/
sq f
t47
.88
Pa�s
poun
d-s
quar
e fe
et p
er s
econ
dlb
-sq
ft/
sec
4.88
3kg
�m2 /
sre
volu
tion
s pe
r m
inut
erp
m1.
000
r/m
inre
volu
tion
s pe
r se
cond
rps
1.00
0r/
ssl
ugsl
ug14
.59
kg
Conversion Factors C-7
Copyright © 2007 Water Environment Federation.
Tab
le 1
.C
onve
rsio
n fr
om c
usto
mar
y to
met
ric
unit
s (i
n al
phab
etic
al o
rder
) (c
onti
nued
).
Mu
ltip
ly C
ust
omar
y U
nit
Ab
bre
viat
ion
By
To
Ob
tain
Met
ric
Un
it
squa
re f
oot
sq f
t9.
290
�10
�2
m2
squa
re f
eet p
er c
apit
asq
ft/
cap
9.29
0 �
10�
2m
2 /ca
psq
uare
fee
t per
cub
ic f
oot
sq f
t/cu
ft
3.28
1m
2 /m
3
squa
re f
eet p
er f
oot
sq f
t/ft
0.30
4 8
m2 /
msq
uare
fee
t per
sec
ond
sq f
t/se
c9.
290
�10
�2
m2 /
ssq
uare
inch
sq in
.64
5.2
mm
2
squa
re m
ilesq
mile
2.59
0km
2
squa
re y
ard
sq y
d0.
836
1m
2
ton
(lon
g)to
n1.
016
Mg
ton
(sho
rt)
ton
0.90
7 2
Mg
907.
2kg
tons
per
acr
eto
n/ac
0.22
4 2
kg/
m2
2.24
2M
g/ha
tons
per
cub
ic y
ard
ton/
cu y
d1.
187
Mg/
m3
wat
t-ho
urW
-hr
3.60
0J
wat
ts p
er s
quar
e fo
otW
/sq
ft
10.7
6W
/m
2
yard
yd0.
914
4m
C-8 Operation of Municipal Wastewater Treatment Plants
Copyright © 2007 Water Environment Federation.
Tab
le 2
.C
onve
rsio
n fr
om m
etri
c to
cus
tom
ary
unit
s (i
n al
phab
etic
al o
rder
) (c
onti
nued
).
Mu
ltip
ly M
etri
c U
nit
Ab
bre
viat
ion
By
To
Ob
tain
Cu
stom
ary
Un
it
capi
ta p
er h
ecta
reca
p/ha
0.40
4 7
cap/
acca
pita
per
squ
are
kilo
met
erca
p/km
22.
590
cap/
sq m
ilecu
bic
met
erm
38.
107
�10
�4
ac-f
t6.
290
barr
el (
oil)
8.38
6ba
rrel
(w
ater
)28
.38
bush
el (
U.S
. dry
)35
.31
cu f
t1.
308
cu y
d26
4.2
gal
2.64
2 �
10�
4m
il. g
alcu
bic
met
ers
per
cubi
c m
eter
m3 /
m3
0.13
3 7
cu f
t/ga
l1.
337
�10
5cu
ft/
mil.
gal
cubi
c m
eter
s pe
r cu
bic
met
er p
er s
econ
dm
3 /m
3 �s5.
999
�10
4cf
m/
1000
cu
ft8.
019
�10
3cf
m/
1000
gal
cubi
c m
eter
s pe
r d
aym
3 /d
0.18
3 5
gpm
2.64
2 �
10�
4m
gd26
4.2
gpd
cubi
c m
eter
s pe
r he
ctar
e pe
r d
aym
3 /ha
�d10
6.9
gpd
/ac
1.06
9 �
10�
4m
gd/
accu
bic
met
ers
per
hect
are
per
seco
ndm
3 /ha
�s14
.29
cfs/
ac9.
147
�10
3cf
s/sq
mile
cubi
c m
eter
s pe
r ki
logr
amm
3 /kg
16.0
2cu
ft/
lbcu
bic
met
ers
per
met
er p
er d
aym
3 /m
�d80
.53
gpd
/ft
cubi
c m
eter
s pe
r m
eter
per
sec
ond
m3 /
m�s
646.
0cf
m/
ft6.
959
�10
6gp
d/
ft3.
676
�10
10gp
d/
mile
Conversion Factors C-9
Copyright © 2007 Water Environment Federation.
Tab
le 2
.C
onve
rsio
n fr
om m
etri
c to
cus
tom
ary
unit
s (i
n al
phab
etic
al o
rder
) (c
onti
nued
).
Mu
ltip
ly M
etri
c U
nit
Ab
bre
viat
ion
By
To
Ob
tain
Cu
stom
ary
Un
it
cubi
c m
eter
s pe
r se
cond
m3 /
s1.
271
�10
5cf
h or
cu
ft/
hr2.
119
�10
3cf
m35
.32
cfs
9.51
5 �
105
gph
1.58
5 �
104
gpm
22.8
3m
gdcu
bic
met
ers
per
squa
re m
eter
per
day
m3 /
m2 �d
24.5
5gp
d/
sq f
t1.
704
�10
�2
gpm
/sq
ft
cubi
c m
eter
s pe
r sq
uare
met
er p
er h
our
m3 /
m2 �h
3.28
1cf
h/sq
ft
cubi
c m
eter
s pe
r sq
uare
met
er p
er s
econ
dm
3 /m
2 �s1.
429
�10
3cf
s/ac
9.14
9 �
107
cfs/
sq m
ile9.
238
�10
10gp
d/
ac2.
121
�10
6gp
d/
sq f
t1.
473
�10
3gp
m/
sq f
t9.
238
�10
4m
gd/
ac1.
181
�10
4cf
h/sq
ft
cubi
c m
illim
eter
mm
36.
102
�10
�5
cu in
.d
egre
es C
elsi
us°C
1.80
0 (°
C)�
32°F
Kel
vin
K1.
800
°Rgr
ams
per
cubi
c m
eter
g/m
38.
344
lb/
mil.
gal
6.24
3 �
10�
2lb
/10
00 c
u ft
8.34
7lb
/10
00 g
algr
ams
per
cubi
c m
eter
per
day
g/m
3 �d2.
720
lb/
d/
ac-f
tgr
ams
per
cubi
c m
eter
per
sec
ond
g/m
3 �s0.
224
7lb
/hr
/cu
ft
gram
s pe
r ki
logr
amg/
kg1.
000
�10
�3
lb/
lb2.
000
lb/
ton
gram
s pe
r lit
erg/
L0.
0624
lb/
cu f
tgr
ams
per
met
erg/
m0.
672
0lb
/10
00 f
tgr
ams
per
seco
ndg/
s7.
937
lb/
hrgr
ams
per
squa
re m
eter
per
day
g/m
2 �d8.
922
lb/
d/
ac0.
204
8lb
/d
/10
00 s
q ft
C-10 Operation of Municipal Wastewater Treatment Plants
Copyright © 2007 Water Environment Federation.
gram
s pe
r sq
uare
met
er p
er s
econ
dg/
m2 �s
17.7
0lb
/d
/sq
ft
0.73
7 3
lb/
hr/
sq f
the
ctar
eha
2.47
1ac
(ac
re)
joul
eJ
0.73
76ft
-lb
joul
es p
er c
ubic
met
erJ/
m3
1.05
1 �
10�
3kW
h/m
il. g
aljo
ules
per
kilo
gram
J/kg
4.29
9 �
10�
4B
tu/
lb0.
859
8B
tu/
ton
1.68
9 �
10�
4hp
-hr/
1000
lbjo
ules
per
lite
rJ/
L8.
461
�10
�5
hp/
gpm
1.05
1kW
h/m
il. g
aljo
ules
per
met
erJ/
m1.
873
�10
�2
ft-l
b/in
.jo
ules
per
squ
are
met
er p
er s
econ
dJ/
m2 �s
0.31
7 1
Btu
/hr
/sq
ft
kilo
gram
kg2.
205
lb (
mas
s)1.
102
�10
�3
ton
6.85
4 �
10�
2sl
ugki
logr
am m
eter
kg�m
0.67
2 0
lb-f
tki
logr
am m
eter
per
sec
ond
kg�m
/s
0.67
2 0
lb-f
t/se
cki
logr
ams
per
capi
ta p
er d
aykg
/ca
p�d
2.20
5lb
/ca
p/d
kilo
gram
s pe
r cu
bic
met
erkg
/m
36.
243
�10
�2
lb/
cu f
t1.
686
lb/
cu y
d83
4 7
lb/
mil.
gal
62.4
2lb
/10
00 c
u ft
kilo
gram
s pe
r cu
bic
met
er p
er d
aykg
/m
3 �d6.
242
�10
�2
lb/
cu f
t62
.42
lb/
d/
1000
cu
ftki
logr
ams
per
cubi
c m
eter
per
hou
rkg
/m
3 �h6.
242
�10
�2
lb/
hr/
cu f
tki
logr
ams
per
cubi
c m
eter
per
sec
ond
kg/
m3 �s
224.
8lb
/hr
/cu
ft
kilo
gram
s pe
r d
aykg
/d
2.20
5lb
/d
kilo
gram
s pe
r he
ctar
e pe
r d
aykg
/ha
�d0.
892
2lb
/d
/ac
kilo
gram
s pe
r he
ctar
e pe
r ye
ar (
annu
m)
kg/
ha�a
0.89
2 2
lb/
yr/
acki
logr
ams
per
hour
kg/
h2.
205
lb/
hrki
logr
ams
per
kilo
gram
per
sec
ond
kg/
kg�s
8.64
�10
4lb
/d
/lb
kilo
gram
s pe
r lit
erkg
/L
3.61
3 �
10�
2lb
/cu
in.
8.34
7lb
/ga
l8.
347
�10
6lb
/m
il. g
al
Conversion Factors C-11
Copyright © 2007 Water Environment Federation.
Tab
le 2
.C
onve
rsio
n fr
om m
etri
c to
cus
tom
ary
unit
s (i
n al
phab
etic
al o
rder
) (c
onti
nued
).
Mu
ltip
ly M
etri
c U
nit
Ab
bre
viat
ion
By
To
Ob
tain
Cu
stom
ary
Un
it
kilo
gram
s pe
r m
eter
kg/
m0.
672
0lb
/ft
kilo
gram
s pe
r se
cond
kg/
s1.
905
�10
5lb
/d
7.93
6 �
103
lb/
hrki
logr
ams
per
squa
re m
eter
kg/
m2
0.20
4 8
lb/
sq f
t (m
ass
dos
e)ki
logr
ams
per
squa
re m
eter
per
day
kg/
m2 �d
0.20
4 8
lb/
d/
sq f
tki
logr
ams
per
squa
re m
eter
per
hou
rkg
/m
2 �h0.
204
8lb
/hr
/sq
ft
kilo
gram
s pe
r sq
uare
met
er p
er s
econ
dkg
/m
2 �s1.
770
�10
4lb
/d
/sq
ft
kilo
gram
s pe
r sq
uare
met
er p
er y
ear
(ann
um)
kg/
m2 �a
0.20
4 8
lb/
yr/
sq f
tki
lojo
ule
kJ0.
947
8B
tuki
lojo
ules
per
cub
ic m
eter
kJ/
m3
2.68
4 �
10�
2B
tu/
cu f
t1.
051
kWh/
mil.
gal
1.40
8 �
10�
3hp
-hr/
1000
gal
kilo
joul
es p
er k
ilogr
amkJ
/kg
0.43
0 0
Btu
/lb
859.
8B
tu/
ton
0.25
2 0
kWh/
ton
0.12
6 0
kWh/
1000
1b
1.68
9 �
10�
4hp
-hr/
lbki
lojo
ules
per
lite
rkJ
/L
1.41
0B
tu/
gal
kilo
met
erkm
0.62
1 4
mile
kilo
met
ers
per
hour
km/
h0.
621
4m
phki
lone
wto
nkN
0.22
4 8
kip
kilo
new
ton
per
met
erkN
/m
0.73
7 5
kip-
ftki
lone
wto
ns p
er m
eter
per
sec
ond
kN/
m�s
0.73
7 5
kip-
ft/
sec
kilo
pasc
alkP
a9.
872
�10
�3
atm
20.8
9ps
f (f
orce
)0.
145
0ps
i (fo
rce)
4.01
9in
. H2O
0.29
6 1
in. H
gki
low
att
kW1.
341
hpki
low
att p
er c
ubic
met
erkW
/m
35.
076
hp/
1000
gal
liter
L3.
532
�10
�2
cu f
t0.
264
2ga
l
C-12 Operation of Municipal Wastewater Treatment Plants
Copyright © 2007 Water Environment Federation.
liter
s pe
r ca
pita
L/
cap
3.53
2 �
10�
2cu
ft/
cap
liter
s pe
r ca
pita
per
day
L/
cap�
d0.
264
2gp
d/
cap
liter
s pe
r cu
bic
met
erL
/m
313
3.7
cu f
t/m
il. g
allit
ers
per
cubi
c m
eter
per
sec
ond
L/
m3 �s
0.48
8 8
cfm
/cu
ft
59.9
9cf
m/
1000
cu
ft8.
019
cfm
/10
00 g
allit
ers
per
hect
are
per
seco
ndL
/ha
�s1.
429
�10
�2
cfs/
ac9.
149
cfs/
sq m
ile6.
418
gpm
/ac
liter
s pe
r ki
logr
amL
/kg
239.
6ga
l/to
nlit
ers
per
met
erL
/m
425.
2ga
l/m
ilelit
ers
per
met
er p
er s
econ
dL
/m
�s0.
645
9cf
m/
ft4.
832
gpm
/ft
6.95
8 �
103
gpd
/ft
liter
s pe
r se
cond
L/
s12
7.1
cfh
2.11
9cf
m3.
532
�10
�2
cfs
2.28
2 �
104
gpd
15.8
5gp
m2.
283
�10
�2
mgd
liter
s pe
r sq
uare
met
er p
er d
ayL
/m
2 �d2.
455
�10
�2
gpd
/sq
ft
liter
s pe
r sq
uare
met
er p
er s
econ
dL
/m
2 �s11
.82
cfh/
sq f
t2.
121
�10
3gp
d/
sq f
t9.
237
�10
�3
gpd
/ac
1.47
3gp
m/
sq f
tm
egag
ram
or
met
ric
ton
Mg
or t
1.10
2to
n (s
hort
)0.
984
3to
n (l
ong)
meg
agra
m p
er c
ubic
met
erM
g/m
30.
842
5to
n/cu
yd
meg
agra
m p
er h
ecta
reM
g/ha
0.44
6 0
ton/
acm
egaj
oule
MJ
0.37
2 5
hp-h
rm
egaj
oule
s pe
r cu
bic
met
erM
J/m
38.
460
�10
�2
hp/
gpm
1.05
1 �
10�
3kW
h/ga
lm
egaj
oule
s pe
r ki
logr
amM
J/kg
168.
9hp
-hr/
1000
lb0.
126
0kW
h/lb
Conversion Factors C-13
Copyright © 2007 Water Environment Federation.
Tab
le 2
.C
onve
rsio
n fr
om m
etri
c to
cus
tom
ary
unit
s (i
n al
phab
etic
al o
rder
) (c
onti
nued
).
Mu
ltip
ly M
etri
c U
nit
Ab
bre
viat
ion
By
To
Ob
tain
Cu
stom
ary
Un
it
meg
ajou
les
per
liter
MJ/
L1.
051
kWh/
gal
meg
alit
erM
L0.
264
2m
il. g
alm
egal
iter
s pe
r d
ayM
L/
d0.
264
2m
gdm
egal
iter
s pe
r he
ctar
e pe
r d
ayM
L/
ha�d
0.10
6 9
mgd
/ac
met
erm
3.28
1ft
met
ers
per
hour
m/
h3.
281
ft/
hrm
eter
s pe
r se
cond
m/
s3.
281
fps
2.23
8m
phm
eter
s pe
r se
cond
squ
ared
m/
s23.
281
ft/
sec2
mic
rogr
ams
per
liter
�g/
L1.
00 (
app.
)pp
bm
icro
met
er�
m1.
000
mic
ron
3.93
7 �
10�
2m
ilm
iligr
amm
g1.
543
�10
�2
grai
nm
illig
ram
s pe
r lit
erm
g/L
5.84
1 �
10�
2gr
ains
per
gal
lon
1.00
(ap
p.)
ppm
mill
ilite
rm
L6.
102
�10
�2
cu in
.m
illili
ters
per
cub
ic m
eter
mL
/m
30.
133
7cu
ft/
mil.
gal
mill
ilite
rs p
er k
ilogr
amm
L/
kg1.
198
�10
�4
gal/
lb0.
239
6ga
l/to
nm
illili
ters
per
met
er p
er d
ay p
er m
eter
(mL
/m
�d)/
m2.
450
�10
�3
gpd
/ft
/ft
-hea
dm
illili
ters
per
sec
ond
mL
/s
0.95
1 5
gph
mill
imet
erm
m3.
937
�10
�2
in.
mill
imet
ers
per
hour
mm
/h
3.93
7 �
10�
2in
./hr
mill
imet
ers
per
seco
ndm
m/
s0.
196
9fp
m11
.81
ft/
hrm
ost p
roba
ble
num
ber
per
cubi
c m
eter
MPN
/m
31.
000
�10
�4
MPN
/10
0 m
Lm
ost p
roba
ble
num
ber
per
liter
MPN
/L
0.10
0 0
MPN
/10
0 m
L
C-14 Operation of Municipal Wastewater Treatment Plants
Copyright © 2007 Water Environment Federation.
new
ton
N0.
224
8lb
f (f
orce
)ne
wto
n m
eter
N�m
0.73
7 6
ft-l
bne
wto
n m
eter
s pe
r m
eter
N�m
/m
0.22
4 8
lb-f
t/ft
dia
pasc
alPa
9.87
2 �
10�
6at
m3.
345
�10
�4
ft (
head
)2.
089
�10
�2
lb/
sq f
t1.
450
�10
�4
psi
pasc
al s
econ
dPa
�s2.
089
�10
�2
lb-s
ec/
sq f
tsq
uare
kilo
met
erkm
20.
386
1sq
mile
squa
re m
eter
m2
2.47
1 �
10�
4ac
10.7
6sq
ft
squa
re m
eter
s pe
r cu
bic
met
erm
2 /m
33.
048
sq f
t/cu
ft
squa
re m
eter
s pe
r m
eter
m2 /
m3.
281
sq f
t/ft
squa
re m
eter
per
sec
ond
m2 /
s10
.76
sq f
t/se
csq
uare
mill
imet
erm
m2
1.55
0 �
10�
3sq
in.
ton
(met
ric)
t1.
102
�10
�3
lb0.
984
3to
n (l
ong)
1.10
2to
n (s
hort
)w
att
W3.
412
Btu
/hr
947.
8B
tu/
sec
44.2
7ft
-lb/
min
0.73
8 0
ft-l
b/se
c1.
341
�10
�3
hp2.
400
�10
�2
kWh/
dw
atts
per
cub
ic m
eter
W/
m3
5.07
6hp
/m
il. g
al3.
797
�10
�2
hp/
1000
cu
ftw
atts
per
lite
rW
/L
5.07
6 �
103
hp/
mil.
gal
wat
ts p
er s
quar
e m
eter
W/
m2
9.29
0 �
10�
2W
/sq
ft
Conversion Factors C-15
Copyright © 2007 Water Environment Federation.
