Force Calculator (F=ma)

Calculate force, mass, or acceleration using Newton's Second Law (F = ma). Includes unit conversions to pounds-force and dynes.

Inputs

Solve For

Mass

Acceleration

m/s²

Force

Tab to move between fields

Results

Force

98.1 N

Mass10 kg

Acceleration9.81 m/s²

Weight on Earth98.1 N

Force (lbf)22.05 lbf

How to Use This Calculator

Select the variable to solve for: force, mass, or acceleration.
Enter the two known values in their respective units (N, kg, m/s2).
Review the calculated result and the formula F = ma.
Check weight on Earth as a reference (weight = mass x 9.81 m/s2).
Use for physics problems, engineering load calculations, or mechanism design.

How the result changes with Mass

Mass	Force
100,000	981,000 N
350,000	3,433,500 N
650,000	6,376,500 N
900,000	8,829,000 N

What each input means

Solve For: The variable to solve for.
Mass: Mass of the object.
Acceleration: Earth's gravity = 9.81 m/s²
Force: Used when solving for mass or acceleration.

How this is calculated

Formula

F = m × a (Newton's Second Law). Force in Newtons equals mass in kilograms multiplied by acceleration in m/s².

Worked example, using the default values

Identify Input Parameters
4 parameters
Solve For = 0, Mass = 10, Acceleration = 9.81, Force = 98.1 = 4 input(s) provided
Calculate Force
Force = resultForce
98.1 = 98.1
Calculate Mass
Mass = resultMass
10 = 10
Calculate Acceleration
Acceleration = resultAcceleration
9.81 = 9.81

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