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Science Calculators

Coulomb's Law Calculator

Verified formula Updated Jun 2026 Private — runs on your device

Enter details
C
C
m
Verified formula Private

Electrostatic force

0.898750

For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.

How to use the Coulomb's Law Calculator

The Coulomb's Law Calculator works out your electrostatic force in an instant. Enter charge 1, charge 2 and distance apart and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.

  1. Enter the charge 1.
  2. Enter the charge 2.
  3. Enter the distance apart.
  4. Read off your electrostatic force — the calculator updates automatically, with no button to press.

Worked example

For example, with charge 1 of 0 C, charge 2 of 0 C and distance apart of 0.1 m, the electrostatic force is 0.898750.

Inputs used
Charge 1 0 C
Charge 2 0 C
Distance apart 0.1 m
Results
Electrostatic force 0.898750

Results are estimates for educational use, not professional advice.

Key terms explained

Force
A push or pull on an object, equal to mass × acceleration (Newton's second law).

Frequently asked questions

It gives the force between two charges: F = k·q₁·q₂ ÷ r², where k is about 8.99×10⁹. Two 1 µC charges 0.1 m apart push with about 0.9 N.

Like charges repel and opposite charges attract. This calculator reports the magnitude of the force.

It follows an inverse-square law, so doubling the distance cuts the force to a quarter.

It is approximately 8.99×10⁹ N·m²/C², linking charge, distance and force in a vacuum.

Enter the charge 1. Enter the charge 2. Enter the distance apart. Read off your electrostatic force — the calculator updates automatically, with no button to press.

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