Voltage Drop Calculator
Calculate voltage drop in electrical wiring. Enter supply voltage, current, wire length, and cross-section to find drop percentage and voltage at load.
How to Use the Voltage Drop Calculator
- Enter the known physical values in the corresponding fields.
- Select the appropriate units if multiple options are available.
- The unknown value is computed instantly from the formula.
- Review the result and the formula explanation below.
Referencia Rápida
| De | A |
|---|---|
| Speed of light | 299,792,458 m/s |
| Gravity (g) | 9.807 m/s² |
| Avogadro's number | 6.022 × 10²³ |
| Boltzmann const. | 1.38 × 10⁻²³ J/K |
| Elementary charge | 1.602 × 10⁻¹⁹ C |
| Planck's const. | 6.626 × 10⁻³⁴ J·s |
Casos de Uso
- •Solving physics homework or exam problems with the correct formula.
- •Verifying experimental measurements and calculations in the lab.
- •Understanding physical relationships between quantities.
- •Quick engineering calculations for design or estimation.
Fórmula
VD = 2 × I × R × L (round trip). Percent Drop = VD / V × 100%. Voltage at Load = V - VD.
Preguntas Frecuentes
How to use?
Enter the data and click the calculate button.
What is acceptable voltage drop?
Less than 3% is good, 3-5% is acceptable, and more than 5% may cause equipment malfunction.
Why multiply by 2?
The factor of 2 accounts for the round trip — current flows through the wire to the load and back through the neutral/return wire.
Is it free?
Yes, all calculators are completely free.