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Weight is the force with which it is pulled towards the Earth. 
So, technically what you're asking for doesn't make sense.

When we say that I'm 80 kgf in weight that means that I'm being pulled towards the centre of earth by a force of this magnitude.

We often confuse mass and weight.
If you're looking to find out mass of earth.


1. F = GmM/r^2 = ma, 

where F is the gravitational force, 
G is the gravitational constant, 
M is the mass of the Earth, 
r is the radius of the Earth,
m is the mass of another object (near the surface of the Earth).

2. GM/r^2= a (The m's canceled out.) 

Now solve for M, the mass of the Earth.

3. M = ar^2/G, 

where a=9.8 m/sec^2, 
r=6.4 x 10^6 m,
G=6.67 x 10^- 11 m^3/(kg sec^2).

4. M = 9.8 x (6.7 x 10^6)2/6.7 x 10^-11 
         = 6.0 x 10^24 kg
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