Mass Calculator
Calculate mass from force and acceleration or convert between mass units worldwide.
Result
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A mass calculator determines mass from force and acceleration using Newton's second law (F = ma), or converts between mass units.
Examples
Weight of a 70 kg person
F = 70 kg x 9.81 m/s² = 686.7 N (about 154.4 lbf). Weight is the force of gravity acting on mass.
Acceleration of a pushed cart
A 50 N force on a 10 kg cart: a = 50 / 10 = 5 m/s².
Frequently Asked Questions
What is the difference between mass and weight?
Mass is the quantity of matter (kg), constant regardless of location. Weight is the gravitational force on that mass (Newtons), which varies with location. On the Moon, your mass stays the same but your weight is about 1/6th of Earth.
What is a Newton?
A Newton (N) is the SI unit of force. It is the force required to accelerate a 1 kg mass by 1 m/s². 1 N is approximately the weight of a small apple (about 0.225 lbf).
Result
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Quick Tips
- •Earth's gravitational acceleration is approximately 9.81 m/s² (32.2 ft/s²).
- •A slug is the imperial unit of mass: 1 slug = 14.59 kg.
- •Force due to gravity (weight) = mass x g. This is why we often confuse mass and weight.