Coulomb's Law Calculator
Electrostatic force between two point charges.
Amortization schedule
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Showing first 12 of months.
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Introduction
Coulomb's Law Calculator — Electrostatic force between two point charges. Enter Charge 1 (C), Charge 2 (C), Distance (m) to get an instant, accurate result.
Formula
Coulomb's law: F = k × q1 × q2 / r², where k ≈ 8.99 × 10⁹ N·m²/C².
Step-by-step
- Enter the Charge 1 (C).
- Enter the Charge 2 (C).
- Enter the Distance (m).
- Click Calculate to see your result instantly.
Real-world example
Example: With Charge 1 (C) = 0.001, Charge 2 (C) = 0.002, Distance (m) = 0.5, the Coulomb's Law Calculator gives Force N: 71900.4143.
Frequently Asked Questions
What does a negative force result mean?
Opposite-sign charges attract, which this calculator shows as a negative force magnitude relative to same-sign repulsion.
How does distance affect the force?
The force follows an inverse-square law — doubling the distance reduces the force to a quarter.
What inputs does the Coulomb's Law Calculator need?
You'll need to provide: Charge 1 (C), Charge 2 (C), Distance (m). All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Coulomb's Law Calculator?
The Coulomb's Law Calculator applies the formula exactly as calculated — Coulomb's law: F = k × q1 × q2 / r², where k ≈ 8.99 × 10⁹ N·m²/C². — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Coulomb's Law Calculator free to use?
Yes, the Coulomb's Law Calculator is completely free, requires no signup, and runs instantly in your browser.
About the Coulomb's Law Calculator
The Coulomb's Law Calculator uses a real, verifiable formula — Coulomb's law: F = k × q1 × q2 / r², where k ≈ 8.99 × 10⁹ N·m²/C². — so results are accurate every time, not an approximation.