LM317 Voltage Calculator Online Free Tool

LM317 Voltage Calculator

Find your output voltage easily by entering resistor values.

R1 (Ohms):

R2 (Ohms):

LM317 Voltage Calculator Online Free Tool

Using LM317 Voltage Calculator Online Free Tool you can easily calculate output voltage by entering R1 and R2 values. Perfect for designing reliable power supplies and regulator circuits.

How to use Lm317 Calculator Tool:

Add the value of R1 resistor (in ohms).
Add the value of R2 resistor (in ohms).
Press the "Calculate" button.
The tool will instantly show your Vout.
Use the result to design or troubleshoot LM317-based circuits.

555 Timer Calculator Online Free Tool

555 Timer Calculator – Astable Mode

This tool calculates the frequency and duty cycle of a 555 timer in astable mode. Enter your values below.

Resistor R1:
Enter the first resistor value

Resistor R2:
Enter the second resistor value

Capacitor C:
Enter the capacitor value

555 Timer Calculator Online Free Tool

Use 555 Timer Calculator Online Free Tool to find frequency and duty cycle for your astable circuits. Just enter resistor and capacitor values to get instant, accurate results.

How to Use the 555 Timer Calculator (Astable Mode):

Select the correct units for your resistors (R1, R2) and capacitor (C) — like Ω, kΩ, µF etc.
Enter the numeric values in the input boxes for R1, R2, and C.
Click on the “🔍 Calculate” button.
The tool will instantly show you the frequency (Hz) and duty cycle (%) of your astable 555 timer circuit.
Use the theme toggle to switch between dark mode and light mode as per your preference.

Battery Life Calculator Online Free Tool

🔋 Battery Life Calculator

Battery Capacity (mAh): Current Draw (mA):

Battery Life Calculator Online Free Tool

Calculate battery life instantly using capacity and current draw. Perfect for electronics projects, DIY makers, and embedded system designers.

How to use Battery Life Calculator Online Free Tool

Enter your battery's capacity in milliamp-hours (mAh) and the current draw of your device in milliamps (mA). Click “Calculate” to instantly see the estimated battery life in hours and days.

LED Resistor Calculator Online Free Tools

Quickly calculate the ideal resistor for your LEDs using this LED Resistor Calculator Online Free Tools. Enter supply voltage, LED voltage, and current to get instant results

How to Use the LED Resistor Calculator:

Enter Supply Voltage (V): This is the voltage coming from your power source, like a battery or adapter (e.g., 9V).
Enter LED Forward Voltage (V): This is the typical voltage drop across the LED. Common values:

Red LED: ~2V
Blue/White LED: ~3.2V

Enter LED Current (mA): The desired current for the LED (e.g., 20 mA is standard for most small LEDs).
Click “Calculate”: The tool will instantly show you the recommended resistor value in ohms (Ω) to safely connect your LED

LED Resistor Calculator

Supply Voltage (V): LED Forward Voltage (V): LED Current (mA):

Ohm's Law Calculator Online Free Tools

Quickly calculate Voltage (V), Current (I), or Resistance (R) using our easy Ohm's Law Calculator Online Free Tools. Perfect for electronics students,

hobbyists, and engineers.

what is ohm law formula? ohm law formula is V = I × R

V represents Voltage, I represents Current, and R represents Resistance in Ohm’s Law (V = I × R).

How to Use This Ohm’s Law Calculator:

Select what you want to calculate from the dropdown (Voltage, Current, or Resistance).

For example, if you select Voltage (V), then:

Enter the Current (I) value in the first box
Enter the Resistance (R) value in the second box
Click Calculate, and your Voltage result will appear instantly!

Ohm's Law Calculator

What do you want to calculate? Value 1: Value 2:

Ohm's Law Formula: V = I × R
Where: V = Voltage (Volts), I = Current (Amps), R = Resistance (Ohms)

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