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How much less do you weigh at the equator than the north pole?

How much less do you weigh at the equator than the north pole? I want to know how much difference the centrifugal force from Earth's rotation makes. Post a link showing how it has been calculated or measured if you want the ten points.

Public Comments

1. From Wikipedia: " . . .sea-level gravitational acceleration increases from about 9.780 m·s-2 at the equator to about 9.832 m·s-2 at the poles, . . ." At the poles, F = - GmM/R^2 (Earth's rotation has no effect on gravity at the poles as r=0.) At the equator, F = - GmM/R^2 + mRω^2 Remember that Earth's polar radius is also smaller than the equatorial radius due to this effect.