Force Calculator
F = m × a • Force from mass and acceleration
Mass must be 0 or greater.
Use negative acceleration for opposite direction.
Quick summary
Enter mass and acceleration, then click Calculate.
Results
Force
— N
Force
— kN
Force
— lbf
Results are calculated from SI units first.
Use this Force Calculator to calculate net force from mass and acceleration using Newton’s second law.
Calculation Method
F = m × a
Where:
- F = net force
- m = mass
- a = acceleration
In SI units:
1 N = 1 kg·m/s²
Example
For an 80 kg object accelerating at 2.5 m/s²:
F = 80 × 2.5
F = 200 N
This is equal to 0.2 kN.
Important Note
The result represents net force, which is the combined effect of all forces acting on the object. If friction, drag, gravity, or several forces are present, an individual applied force may be different from the calculated net force.
A negative result indicates direction relative to the chosen sign convention.