How to convert lbf to N?
1 lbf = 4.448 221 615 260 5 N
The formula to convert a force expressed in poundforce [lbf] into a force expressed in newtons [N] is given by :
with :

the force expressed in newtons 
the force expressed in pounds
Since
 the value of one pound is exactly defined as 0.45359237 kg
 and the gravity is defined by convention as 9,80665 m/s²,
the value of one poundforce is defined exactly as 1 lbf = 0.453 592 37 kg × 9.806 65 m/s² = 4.448 221 615 260 5 N.
1 lbf = 4.448 221 615 260 5 N
The formula to convert a force expressed in poundforce [lbf] into a force expressed in newtons [N] is given by :
with :

the force expressed in newtons 
the force expressed in pounds
Since
 the value of one pound is exactly defined as 0.45359237 kg
 and the gravity is defined by convention as 9,80665 m/s²,
the value of one poundforce is defined exactly as 1 lbf = 0.453 592 37 kg × 9.806 65 m/s² = 4.448 221 615 260 5 N.
1 lbf = 4,448 221 615 260 5 N
The formula to convert a force expressed in poundforce [lbf] into a force expressed in newtons [N] is given by :
with :

the force expressed in newtons 
the force expressed in pounds
Since
 the value of one pound is exactly defined as 0.45359237 kg
 and the gravity is defined by convention as 9,80665 m/s²,
the value of one poundforce is defined exactly as 1 lbf = 0.453 592 37 kg × 9.806 65 m/s² = 4.448 221 615 260 5 N.
1 lbf = 4,448 221 615 260 5 N
The formula to convert a force expressed in poundforce [lbf] into a force expressed in newtons [N] is given by :
with :

the force expressed in newtons 
the force expressed in pounds
Since
 the value of one pound is exactly defined as 0.45359237 kg
 and the gravity is defined by convention as 9,80665 m/s²,
the value of one poundforce is defined exactly as 1 lbf = 0.453 592 37 kg × 9.806 65 m/s² = 4.448 221 615 260 5 N.
1 lbf = 4,448 221 615 260 5 N
The formula to convert a force expressed in pounds [lbf] into a force expressed in newtons [N] is given by :
with :

the force expressed in newtons 
the force expressed in pounds
Since
 the value of one pound is exactly defined as 0.45359237 kg
 and the gravity is defined by convention as 9,80665 m/s²,
the value of one poundforce is defined exactly as 1 lbf = 0,453 592 37 kg × 9,806 65 m/s² = 4,448 221 615 260 5 N.
1 lbf = 4,448 221 615 260 5 N
The formula to convert a force expressed in pounds into a force expressed in newtons is given by :
with :

the force expressed in newtons 
the force expressed in pounds
Since
 the value of one pound is exactly defined as 0.45359237 kg
 and the gravity is defined by convention as 9,80665 m/s²,
the value of one poundforce is defined exactly as 1 lbf = 0,453 592 37 kg × 9,806 65 m/s² = 4,448 221 615 260 5 N.
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