Free Electronics Calculators & Tools
Your comprehensive destination for professional electronics calculators and educational resources. From Ohm's Law to complex circuit analysis, we provide the tools engineers and students need.
Featured: Interactive calculators with step-by-step explanations, perfect for learning and professional use.
Popular Electronics Calculators
Ohm's Law Calculator (V=IR)
Calculate Voltage, Current, or Resistance using Ohm's Law. Essential for circuit analysis and electrical engineering calculations.
Calculate V=IRResistor Color Code Calculator
Decode resistor values from color bands (4, 5, or 6 bands). Includes tolerance and temperature coefficient calculations.
Decode ColorsSeries/Parallel Resistor Calculator
Calculate total resistance for multiple resistors in series or parallel configurations. Supports unlimited resistor values.
Calculate Total RLED Current Limiting Resistor Calculator
Calculate the required current limiting resistor for LED circuits. Prevents LED damage and ensures optimal brightness.
Calculate LED RCapacitor Code Calculator
Decode capacitor markings and codes (e.g., 104, 472K, 2R2J) to find capacitance values in pF, nF, and µF.
Decode CapacitorVoltage Divider Calculator
Calculate output voltage, current, and power dissipation in voltage divider circuits. Essential for analog circuit design.
Calculate Vout555 Timer Astable Calculator
Calculate frequency, duty cycle, and timing components for 555 timer circuits in astable (oscillator) mode.
Calculate 555 TimerXL6019 DC-DC Converter Calculator
Calculate output voltage and feedback resistors (R1, R2) for XL6019 based step-up DC-DC converter circuits.
Calculate DC-DCAI-Powered Electronics Assistant
Get instant help with electronics calculations, circuit analysis, and component selection. Our AI assistant can explain concepts, recommend the right calculator, and even perform custom calculations.
Features: Step-by-step explanations, formula derivations, component recommendations, and troubleshooting guidance.
Click the chat bubble (bottom-right) to get started!
Why Choose Tech Info 101?
- Free & No Registration: All calculators are completely free to use
- Mobile Optimized: Works perfectly on phones, tablets, and desktops
- Educational Focus: Each calculator includes explanations and formulas
- Professional Grade: Accurate calculations trusted by engineers worldwide
- Regular Updates: New calculators and features added regularly
Frequently Asked Questions
What is Ohm's Law and how do I calculate it?
Ohm's Law states that V = I × R, where V is voltage (volts), I is current (amperes), and R is resistance (ohms). Use our Ohm's Law calculator to quickly find any missing value when you know the other two.
How do I read resistor color codes?
Resistor color codes use colored bands to indicate resistance values. Each color represents a digit (0-9), with additional bands for multiplier and tolerance. Our resistor color code calculator supports 4, 5, and 6-band resistors.
What's the difference between series and parallel resistors?
In series circuits, resistors are connected end-to-end and total resistance equals the sum of all resistances. In parallel circuits, resistors share the same voltage and total resistance is less than the smallest individual resistance. Use our series/parallel calculator for quick calculations.
How do I calculate the correct resistor for an LED?
To calculate an LED current limiting resistor, use the formula: R = (Vs - Vf) / If, where Vs is supply voltage, Vf is LED forward voltage, and If is desired forward current. Our LED resistor calculator makes this calculation simple.
Are these calculators free to use?
Yes! All our electronics calculators are completely free to use. No registration, no downloads, no hidden fees. Simply visit any calculator page and start calculating immediately.