Ohm’s Law Calculator

Calculate voltage, current, resistance, and power in electrical circuits with our free Ohm’s Law calculator. Essential for electronics projects, electrical engineering, and circuit design.

Why Use This Calculator?

• Complete Calculations: Find voltage, current, resistance, and power
• Automatic Conversion: Enter values in different units (mA, A, kΩ, etc.)
• Instant Results: Get all related values immediately
• Error Prevention: Avoid common calculation mistakes
• Educational Tool: Learn about electrical relationships

How to Use It

1. Enter any two known values (voltage, current, or resistance)
2. Select the appropriate units for your values
3. Click “Calculate” to find the remaining values
4. Power calculation is automatically included

Understanding Results

The calculator provides:

• Voltage (V): Electrical potential difference
• Current (I): Flow of electrical charge
• Resistance (R): Opposition to current flow
• Power (P): Rate of energy transfer

Common Applications

• Electronics: Circuit design and analysis
• Electrical Engineering: Power systems
• DIY Projects: Component selection
• Education: Teaching electrical concepts
• Troubleshooting: Circuit problems

Tips for Better Results

• Use consistent units for accuracy
• Double-check your input values
• Consider component tolerances
• Account for temperature effects
• Verify results match expected ranges

Technical Notes

• Based on Ohm’s Law: V = I × R
• Power calculation: P = V × I
• Supports metric prefixes (m, k, M)
• Handles common electrical units
• Provides warnings for unusual values