Force Calculator

Calculate force, mass, or acceleration using Newton's second law F=ma.

By Konstantin Iakovlev · Updated April 2026 · Source: Khan Academy

Force

98.10 N

Weight

98.10 N

F = m x a

Force98.10 N
Weight (mg)98.10 N
Pressure (F/A)196.20 Pa

Use the Force Calculator above to calculate your results. Enter your values and see instant results — all calculations run in your browser.

Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.

How It Works

Newton's Second Law of Motion ties force, mass, and acceleration together, and this tool lets you solve for whichever one you're missing. The relationship matters well beyond the classroom in 2026, underpinning work in robotics, aerospace engineering, and sports analytics. Consider the autonomous delivery drones expected to complete over 500 million deliveries annually by 2026: every one depends on accurate force calculations to stay stable and fly efficiently.

The law is written F = ma, with F for force, m for mass, and a for acceleration. Enter any two of the three and the calculator returns the third, rearranging the equation algebraically to isolate whatever you're after, either m = F/a or a = F/m.

Inputs need to share consistent units, because that is where results most often go wrong. Pairing kilograms for mass with miles per hour for acceleration, for example, hands back a force value that simply isn't right. One more point worth holding onto: force is a vector with both magnitude and direction, even though this calculator deals only with magnitude.

Example: Launching a 2026 Satellite Constellation

  1. 1 Imagine SpaceX is launching a new constellation of 100 Starlink-like satellites in 2026, each with a mass of 250 kg. The rocket needs to accelerate each satellite at 5 m/s² during deployment.
  2. 2 To calculate the force required for each satellite, we use the formula F = ma. So, F = 250 kg * 5 m/s².
  3. 3 The force required for each satellite is 1250 Newtons.
  4. 4 This calculation helps engineers design the deployment mechanism and thrusters for the satellites, ensuring they achieve their desired orbital velocity efficiently within the 2026 launch schedule, where each launch window is critical and can cost upwards of $60 million.

Source: Khan Academy · Last updated: April 2026

Frequently Asked Questions

What is Newton's second law of motion?
Newton's second law states that force equals mass times acceleration (F = ma). A net force of 1 newton accelerates a 1-kilogram mass at 1 meter per second squared. If multiple forces act on an object, the net force determines the acceleration.
What is the difference between mass and weight?
Mass is the amount of matter in an object (measured in kilograms) and is constant everywhere. Weight is the gravitational force on that mass (measured in newtons) and varies with gravity. On Earth, weight in newtons equals mass times 9.81 m/s2.
How do I convert between newtons and pounds-force?
One newton equals approximately 0.2248 pounds-force, and one pound-force equals 4.448 newtons. A 1-kilogram mass weighs 9.81 newtons or about 2.2 pounds on Earth.

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