Electric charge is a fundamental property of matter that causes it to experience a force when placed in an electromagnetic field. There are two types of electric charge: positive and negative (commonly carried by protons and electrons respectively). If you're working with electrical circuits, you might also find our conductivity converter useful for understanding how materials conduct electricity.
Electric charge is conserved in isolated systems and is quantized, meaning it comes in integer multiples of the elementary charge (e). The SI unit for electric charge is the coulomb (C), which represents approximately 6.242×10¹⁸ elementary charges. For related electrical calculations, check out our Ohm's Law calculator to explore relationships between voltage, current, and resistance.
| From Unit | To Unit | Formula |
|---|---|---|
| Coulomb (C) | mC, μC, nC, pC | Multiply by 10³, 10⁶, 10⁹, or 10¹² |
| mC, μC, nC, pC | Coulomb (C) | Divide by respective power of ten |
| Coulomb (C) | Ampere-hour (Ah) | C ÷ 3600 |
| Ampere-hour (Ah) | Coulomb (C) | Ah × 3600 |
| Coulomb (C) | Elementary charge (e) | C ÷ 1.602176634×10⁻¹⁹ |
| Elementary charge (e) | Coulomb (C) | e × 1.602176634×10⁻¹⁹ |
This tool converts between different electrical charge units used in everyday electronics, helping you:
A typical 4000 mAh phone battery contains about 14,400 Coulombs of charge. That's approximately 9 × 10²² elementary charges! To understand the energy this represents, you might use our energy converter to see the equivalent in watt-hours or joules.
A 1000 μF capacitor charged to 300V stores 0.3 Coulombs - enough for a bright flash. That's 300,000 μC or 1.87 × 10¹⁸ electrons. For precise capacitor calculations, our inductance converter can help with related circuit parameters.
Walking on carpet can generate about 30,000 volts but only 0.000001 Coulombs (1 μC) of charge. That's still 6.24 × 10¹² electrons!
SI unit. One Coulomb = charge from 1 amp flowing for 1 second. Huge for everyday use.
Battery standard. 1000 mAh = phone battery. 1 mAh = 3.6 Coulombs.
Tiny! Charge of 1 electron. 6.24 × 10¹⁸ e = 1 Coulomb. Used in physics.
2.5 mAh or 500 μC1.6e-19 for electron chargeTap-friendly design: Large buttons and spaced options work perfectly on phones and tablets.
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Quick Swaps: Use the "Swap Units" button instead of re-selecting both units.
A: mAh measures capacity over time, while Coulombs measure total charge. They're related but different units. For battery energy calculations, our electrical energy cost converter can help estimate running costs.
A: Extremely tiny! 1 pC = 0.000000000001 C. Used in sensitive electronic measurements.
A: No - voltage and charge are different. But you can calculate energy if you know both (use Battery Mode).
A: mAh to Coulombs for batteries, and C to μC for electronics work. For resistance calculations, try our resistance color code converter.
Accuracy Disclaimer: This tool uses standard conversion factors. For scientific work, verify constants. Battery calculations are estimates - actual performance varies.
Device Compatibility: Works on all modern browsers, mobile devices, and tablets. No installation needed.
Update Notice (Nov 2025): Current version includes latest physical constants and improved mobile interface.
Need help? Try the "Show Examples" button or check the tabs above for detailed explanations.