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Electric Field of a Point Charge Calculator
Field strength at a distance from a point charge using Coulombs law.
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Electric field strength
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Field strength at a distance from a point charge using Coulombs law.
Electric Field of a Point Charge Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: E = kQ / r^2.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Electric Quick Guide
Typical values for reference.
| Charge nC | Distance m | Field | |
|---|---|---|---|
| 10 | 0.5 | 359.5 N/C | |
| 1 | 0.1 | 898.8 N/C | |
| 100 | 2 | 224.7 N/C | |
| -5 | 0.3 | 499.3 N/C | |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Electric Field of Calculator FAQ
Answers to common questions about this calculator.
Force per unit charge at a point.
Field falls with the square of distance.
Coulomb constant, about 8.99 billion N m2 per C2.
For point charges, yes.