Weight (W = mg)

Also known as W = mg · convert mass to weight

W = m g

W =

m =

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Constant used — built into this formula, no need to enter

g_{n} = 9.80665\ \text{m/s}^{2}

Standard acceleration of gravity · exact

Learning zone

Mass measures how much matter you have; weight is the gravitational force on it. A 70 kg person weighs 70 × 9.80665 ≈ 687 N on Earth — but only about 114 N on the Moon, with the same mass. The g used here, 9.80665 m/s², is the standard gravity fixed exactly by international agreement in 1901.

Weight (W = mg)

W = m g

Where

$W$ = Weight
$m$ = Mass

Missing one of these? Work it out first, then come back

Weight — Newton's Second Law, Impulse (J = FΔt)
Mass — Newton's Second Law, Kinetic Energy

Part of this formula set

Gravitation and orbital mechanics

8 formulasNewton's inverse-square law and what falls out of it in orbit — field strength, orbital speed and period, Kepler's third law, and escape velocity.