All Electronics Tools
555 Timer Calculator
Calculate frequency, duty cycle, and timing for 555 timer circuits in astable and monostable modes
Battery Life Calculator
Calculate battery runtime from capacity and current draw, or find the required capacity for a desired runtime
Capacitor Code Calculator
Decode ceramic capacitor 3-digit codes to actual capacitance values, or reverse-lookup codes from a known value
Decibel Calculator
Convert between decibels and power/voltage ratios, calculate gain and loss in dB, and work with common audio and RF reference levels
Drone Flight Time Calculator
Estimate FPV and drone battery flight time based on capacity, voltage, weight, and motor configuration
FPV Motor KV Calculator
Find the optimal motor KV rating for your FPV drone based on battery voltage, propeller size, frame size, and flying style
Inductor Calculator
Calculate inductive reactance, LC resonant frequency, and RL circuit impedance with unit conversions
LED Resistor Calculator
Calculate the current-limiting resistor for any LED circuit. Enter supply voltage, forward voltage, and forward current to get the exact and nearest standard resistor value.
Ohm's Law Calculator
Calculate voltage, current, resistance, or power from any two known values using Ohm's Law and the power equation
PCB Trace Width Calculator
Calculate PCB trace width from current, copper thickness, and temperature rise using IPC-2152 standard for internal and external layers
Resistor Color Code Calculator
Decode 4-band, 5-band, and 6-band resistor color codes or reverse-lookup colors from a resistance value
Voltage Divider Calculator
Calculate output voltage, find missing resistor values, and view current draw and power dissipation for resistive voltage divider circuits
Electronics Calculators on FastTools help hobbyists, students, and engineers solve common circuit design problems instantly. Every calculator runs entirely in your browser — no downloads, no signups, no data sent anywhere.
From basic Ohm's law calculations to resistor color code decoding and battery life estimation, these tools give you quick, accurate answers for your next project.
Frequently Asked Questions
Are these electronics calculators free?
Yes, every tool is completely free to use with no signup, no account, and no hidden fees.
Is my data safe?
Absolutely. All calculations run locally in your browser. No data is sent to any server or stored anywhere.
Do I need to create an account?
No. Every tool works instantly with no registration required. Just open and start using.