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Free online voltage divider calculator to find output voltage, current, and resistance easily. Accurate potential divider tool with step-by-step results.
A voltage divider calculator is a simple and powerful online tool that helps you calculate output voltage in an electrical circuit. It is also known as a potential divider calculator. This tool is widely used in electronics, engineering, and DIY projects to reduce voltage safely and accurately.
We developed this voltage divider calculator to make voltage calculation easy for students, engineers, technicians, and hobbyists. With just a few inputs, you can instantly find the output voltage, current, resistance, and power values. No manual calculation is needed.
This online voltage divider tool works for both ideal circuits and real circuits with load resistance. It gives accurate results with clear steps.
A voltage divider is a simple electrical circuit that uses two resistors connected in series to reduce voltage. It takes a high input voltage and converts it into a lower output voltage.
Voltage dividers are commonly used in sensors, microcontrollers, battery monitors, amplifiers, and signal conditioning circuits.
When voltage passes through resistors, it drops according to their resistance values. This property is used to control and adjust voltage levels.
Because of this, voltage dividers are also called potential dividers.
Using an online voltage divider calculator saves time and prevents calculation mistakes. It gives instant and accurate results without using formulas manually.
This calculator is useful for:
Our calculator supports different units such as volts, kilo-ohms, and mega-ohms. It also supports load resistance for real-world applications.
The voltage divider formula depends on whether a load resistor is connected or not.
When no load is connected to the output, the formula is:
Vout = Vin × R2 / (R1 + R2)
Where
This formula is accurate for ideal circuits.
When a load resistor is connected, R2 and RL work in parallel.
First, calculate parallel resistance:
Req = (R2 × RL) / (R2 + RL)
Then calculate output voltage:
Vout = Vin × Req / (R1 + Req)
Where
This formula gives real-life accurate results.
Using our online voltage divider calculator is very easy.
Step 1: Enter Input Voltage
Type the input voltage value in the Vin field and select the correct unit.
Step 2: Enter Resistor R1
Enter the resistance value of the first resistor and choose the unit.
Step 3: Enter Resistor R2
Enter the resistance value of the second resistor and select its unit.
Step 4: Enter Load Resistance (Optional)
If your circuit has a load, enter the RL value. If not, leave it empty.
Step 5: Click Calculate
Click the Calculate button. The tool will instantly show:
No technical skills are required.
Let us understand with a simple example.
Given values:
Vin = 12 V
R1 = 2000 Ω
R2 = 1000 Ω
No load connected
Step 1: Apply Formula
Vout = Vin × R2 / (R1 + R2)
Vout = 12 × 1000 / (2000 + 1000)
Vout = 12000 / 3000
Vout = 4 V
Final Answer
Output Voltage = 4 Volts
Given values:
Vin = 10 V
R1 = 1000 Ω
R2 = 2000 Ω
RL = 2000 Ω
Step 1: Calculate Parallel Resistance
Req = (2000 × 2000) / (2000 + 2000)
Req = 4000000 / 4000
Req = 1000 Ω
Step 2: Calculate Vout
Vout = 10 × 1000 / (1000 + 1000)
Vout = 10 × 0.5
Vout = 5 V
Output Voltage = 5 Volts
The voltage divider calculator is an essential tool for anyone working with electronics. It helps you find output voltage quickly and correctly. Whether you are a student, engineer, or hobbyist, this tool makes circuit design simple.
Our online potential divider calculator follows standard electrical laws and gives reliable results. It saves time, avoids errors, and improves productivity.
If you want accurate voltage calculations without manual work, this calculator is the best choice.
A voltage divider is used to reduce voltage levels in electronic circuits. It is commonly used in sensors, microcontrollers, and signal processing systems.
Yes. This calculator uses Ohm’s Law and standard electrical formulas. It also supports load resistance for real-life accuracy.
Yes. You can use it for any voltage value. Just make sure to select proper resistor ratings in real circuits.
There is no difference. Both terms describe the same circuit that divides voltage using resistors.
Yes. It calculates power in resistors and total circuit power to help you choose safe components.