Voltage Divider Calculator – Compute Output Voltage and Load Effect

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Voltage Divider / Test Point Calculator

Calculate the voltage at a divider or test point in a resistive circuit. This tool computes output voltage and expected deviation under load.

Input Parameters

Input Voltage (Vin)

Top Resistor R1 (Ω)

Bottom Resistor R2 (Ω)

Load Resistor Rload (optional, Ω)

Results

Output Voltage (Vout)

Output with Load (Vout_loaded)

Voltage Deviation (%)

Test Note

Equations Used

Vout = Vin × R2 / (R1 + R2)

Vout_loaded = Vin × (R2 || Rload) / (R1 + (R2 || Rload))

Voltage Deviation % = (Vout_loaded - Vout)/Vout × 100%

Frequently Asked Questions (FAQ)

Q1: What is a voltage divider?
A: A simple resistive circuit to scale voltage from a higher source.

Q2: Does adding a load affect the output voltage?
A: Yes, the output drops depending on the load resistor.

Q3: Can this tool be used for AC signals?
A: Only for DC resistive voltage dividers; AC requires impedance analysis.

Q4: Is it suitable for testing ADC input points?
A: Yes, it helps predict voltage before connecting to ADC or measurement circuit.

Q5: Can I include multiple parallel loads?
A: Only one Rload can be entered; parallel combinations must be computed manually.

Disclaimer: For engineering reference only. Actual voltage depends on component tolerances, temperature, and wiring. Verify with measurement before critical use.

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