Online Tools

    Force Calculator

    Solve Newton's second law for force, mass or acceleration with SI and imperial force units.

    Quick scenarios
    Force
    4,500
    Mass: 1,500 kg
    Acceleration: 3 m/s²
    Force: 4,500 N (458.87 kgf)
    in kN
    4.5
    in kgf
    458.87
    in lbf
    1,011.64
    in dynes
    4.500e+8
    Comparison: ~ Small car engine thrust estimate (1 metric ton at 3 m/s²) (3,000 N)
    How force changes at the same mass: 1,500 kg

    Newton's second law solver

    The English SERP expects a direct calculator that can solve for any one of force, mass or acceleration.

    F is net force, m is mass and a is acceleration.

    Rearranged forms solve the inverse cases.

    Net force caveat

    In physics problems, F usually means net force along the chosen axis after all individual forces have been combined.

    Frequently Asked Questions

    Sources and References

    Calculations are based on the listed reference sources. Links open in a new tab.

    Updated:

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