Coulomb's Law Calculator

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Calculates the electrostatic force between two point charges.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Charge 1 (q1) in Coulombs (C), Charge 2 (q2) in Coulombs (C), and Distance (r) between charges in meters (m) in the units shown.

Step 2

Read Electrostatic Force (F) in Newtons (N) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Charge 1 (q1) in Coulombs (C): 1 C; Charge 2 (q2) in Coulombs (C): 1 C; Distance (r) between charges in meters (m): 1 m

Electrostatic Force (F) in Newtons (N): 8,987,551,792 N

Charge 1 (q1) in Coulombs (C): 1 C; Charge 2 (q2) in Coulombs (C): -1 C; Distance (r) between charges in meters (m): 1 m

Electrostatic Force (F) in Newtons (N): -8,987,551,792 N

Charge 1 (q1) in Coulombs (C): 1 C; Charge 2 (q2) in Coulombs (C): 1 C; Distance (r) between charges in meters (m): 0.5 m

Electrostatic Force (F) in Newtons (N): 35,950,207,170 N

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