Force Calculator (F = m·a)

What this tool does

Newton's second law in its everyday form. The third result is the weight, which is simply the force the same mass experiences under gravity — the reason a 100 kg object presses down with about 981 newtons whether it is accelerating or not.

Formula

F = m × a

Variables

Worked example

Limitations

• Mixing units is the most common source of error. Convert every input to the units shown next to each field before calculating.
• The formula assumes ideal conditions: no friction losses, no air resistance and no efficiency losses unless you enter them.