Science calculator
Coulomb's Law Calculator
Calculate electric force between two charges.
About the coulomb's law calculator
Coulomb's law calculator computes the electric force between two point charges.
How to use this calculator
- 1
Enter charges
Enter both charges in Coulombs.
- 2
Enter distance
Enter the separation distance in meters.
- 3
View results
See the electric force.
How the calculation works
F = k × q₁ × q₂ ÷ r² where k = 8.99 × 10⁹ N·m²/C².
Example: q₁=q₂=1μC, r=0.1m: F≈0.9N.
Understanding scientific constants
Key constants used: g = 9.81 m/s² (Earth gravity), c = 299,792,458 m/s (speed of light), G = 6.674×10⁻¹¹ N·m²/kg² (gravitational constant), h = 6.626×10⁻³⁴ J·s (Planck's constant), R = 8.314 J/(mol·K) (ideal gas constant). Results assume ideal conditions — real-world measurements may vary.
Ideal vs. real-world conditions
Most physics calculators assume ideal conditions: no air resistance, perfect vacuums, uniform gravity. Real-world results will differ due to friction, air resistance, temperature variations, and measurement uncertainty. Use these tools for learning and estimation, not precision engineering.
Important limitations
This tool provides a mathematical estimate based only on the values entered. It does not account for regulations, taxes, lender fees, market conditions, or individual circumstances. Results are for planning purposes only — consult a qualified professional for regulated, medical, financial, or construction decisions.
Frequently asked questions about coulomb's law calculator
How accurate is the coulombs law calculator?+
The calculation follows the displayed formula and retains full numeric precision before formatting the result.
Can I use the result professionally?+
Use it as a planning estimate. Confirm regulated, medical, financial, or construction decisions with a qualified professional.