Science
Force Calculator
Use the force calculator for physics homework, lab checks, and quick Newton's second law problems.
Choose the missing quantity; the calculator hides that field and solves it from the others.
Solved value
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- Force
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- Mass
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- Acceleration
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Student quick launch
Grade planning, algebra checks, and formulas students reach for most.
Study path
Use this calculator with
Follow these when you want the formula behind the answer, a short lesson, or nearby tools in the same topic.
What the force calculator solves
Use the force calculator for physics homework, lab checks, and quick Newton's second law problems.
Formula
How to use it
- Choose the quantity you want to solve for.
- Enter the known values with consistent units.
- Check the rearranged formula, substitution, and warnings before using the result.
How to read the answer
Force increases when either mass or acceleration increases. The result is in newtons when mass is in kilograms and acceleration is in meters per second squared.
Common mistakes and edge cases
- Do not enter weight in pounds as mass without converting.
- Acceleration can be smaller than 1; decimals are valid.
- A zero acceleration means zero net force in this model.
Worked examples
Solve the main formula
Solved value
Force = 20 N
Reverse-solve a missing input
Solved value
Mass = 4 kg
Frequently asked questions
Can the force calculator solve for a missing variable?+
Yes. Use the solve-for control to hide the missing value, then enter the other known values with compatible units.
Why do the units matter?+
Formula calculators assume the entered values are already in matching units. Convert first when your measurements use mixed systems.
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Last updated: May 15, 2026