電子回路計算ツール
電子設計のための無料オンライン計算機。トレース幅、抵抗値、分圧器などを計算できます。
★注目
Ohm's Law Calculator
抵抗計算機Calculate voltage, current, resistance, and power using Ohm's Law. Enter any two values to find the rest instantly.
LED Resistor Calculator
抵抗計算機Calculate the correct current-limiting resistor value for your LED circuit. Get power dissipation and nearest standard resistor values.
Voltage Divider Calculator
抵抗計算機Design voltage dividers with ease. Calculate resistor values or output voltage for your circuit.
PCB Trace Width Calculator
PCB設計計算機Calculate optimal PCB trace width for your current requirements using IPC-2221 standards. Get resistance and voltage drop estimates.
Buck Converter Calculator
電源計算機Design buck (step-down) DC-DC converters. Calculate inductor, capacitor values, and component ratings.
E-Series Resistor Finder
部品リファレンスFind the closest standard resistor value from E12, E24, E48, or E96 series. Get percentage error and alternatives.
すべてのツール
Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law. Enter any two values to find the rest instantly.
LED Resistor Calculator
Calculate the correct current-limiting resistor value for your LED circuit. Get power dissipation and nearest standard resistor values.
Voltage Divider Calculator
Design voltage dividers with ease. Calculate resistor values or output voltage for your circuit.
Pull-up Resistor Calculator
Calculate general-purpose pull-up and pull-down resistor values. Consider input thresholds and load current.
I2C Pull-up Resistor Calculator
Calculate optimal I2C pull-up resistor values based on bus capacitance and speed mode. Supports Standard, Fast, and Fast Mode Plus.
Resistor Color Code Calculator
Decode resistor color bands to find the value, or find color bands for a given resistance. Supports 4, 5, and 6 band resistors.
Decoupling Capacitor Calculator
Calculate optimal bypass capacitor values for your ICs. Get recommendations based on power consumption and frequency.
Capacitor Code Calculator
Decode ceramic capacitor markings (103, 104, 474) to actual values. Convert between pF, nF, and µF units instantly.
PCB Trace Width Calculator
Calculate optimal PCB trace width for your current requirements using IPC-2221 standards. Get resistance and voltage drop estimates.
PCB Impedance Calculator
Calculate characteristic impedance for microstrip and stripline PCB traces. Essential for high-speed digital and RF design.
Via Current Calculator
Calculate maximum current capacity for PCB vias. Get resistance, power dissipation, and parallel via recommendations.
Thermal Via Calculator
Calculate thermal via arrays for heat dissipation. Get thermal resistance, via count, and array layout recommendations for PCB thermal management.
Wire Gauge (AWG) Calculator
Calculate the correct wire gauge for your application. Get voltage drop, power loss, and current capacity based on AWG standards.
Buck Converter Calculator
Design buck (step-down) DC-DC converters. Calculate inductor, capacitor values, and component ratings.
Boost Converter Calculator
Design boost (step-up) DC-DC converters. Calculate inductor, capacitor values, and component ratings for your power supply.
LDO Dropout Calculator
Calculate minimum input voltage for LDO regulators. Check headroom, power dissipation, and efficiency for your design.
Power Dissipation Calculator
Calculate heat dissipation and junction temperature for semiconductors. Determine heatsink requirements and thermal management.
Battery Life Calculator
Estimate battery runtime for your project. Account for duty cycles and efficiency factors.
555 Timer Calculator
Calculate 555 timer values for astable and monostable modes. Get frequency, duty cycle, and timing component values.
RC/LC Filter Calculator
Design passive and active filters. Calculate component values for lowpass, highpass, bandpass, and notch filters.
MOSFET Gate Resistor Calculator
Calculate gate resistor values for MOSFET switching circuits. Optimize turn-on/turn-off times, minimize switching losses, and prevent oscillation.
Electronics Unit Converter
Convert between electronics units instantly. Supports resistance, capacitance, inductance, frequency, voltage, current, power, and PCB length units.
E-Series Resistor Finder
Find the closest standard resistor value from E12, E24, E48, or E96 series. Get percentage error and alternatives.
SMD Package Size Guide
Visual comparison of SMD component package sizes. Compare 0402, 0603, 0805, 1206, SOT-23, SOIC, and more.