Free online calculators for electronics engineers, PCB designers and makers.
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Power dissipation, efficiency and thermal calculation.
Calculate LM317 adjustable output voltage.
Calculate resistor values for LM317.
Thermal and power loss calculator.
Dropout and thermal calculation.
AMS1117 dropout and thermal calculator.
Efficiency and wasted power calculator.
Feedback divider resistor calculator.
Buck converter design helper.
LM2596 feedback and ripple calculator.
XL4015 feedback and power calculator.
Input and output capacitor selection.
Estimate ESP32 battery runtime using active current, sleep current, duty cycle, battery capacity and regulator efficiency.
Calculate ESP32 deep sleep runtime from sleep current, wake time, wake interval and battery capacity.
Check ESP32 brownout risk from peak current, regulator dropout, wire resistance and input voltage.
Estimate heat and junction temperature for the LDO powering an ESP32 module.
Estimate ESP32 average current when WiFi TX, WiFi idle and sleep modes are used.
Estimate bulk capacitor size needed to support ESP32 peak current bursts.
Calculate voltage drop in wires, USB cables or PCB traces powering an ESP32.
Estimate STM32 battery runtime from active current, sleep current, duty cycle, battery capacity and regulator efficiency.
Compare STM32 run, sleep, stop and standby modes and estimate average current for low-power firmware.
Estimate LDO power dissipation and temperature rise for STM32 boards powered from USB, battery or DC input.
Calculate STM32 GPIO load current, total port current and resistor requirements for LEDs or external loads.
Estimate STM32 ADC sampling time requirements from source impedance, ADC capacitor and target settling accuracy.
Estimate STM32 current change with clock frequency and active duty cycle for rough power budgeting.
Estimate Arduino battery runtime using active current, sleep current, duty cycle and regulator efficiency.
Calculate LED resistor values for Arduino GPIO pins using supply voltage, LED voltage and target current.
Calculate voltage divider output voltage and resistor current for Arduino analog input circuits.
Estimate Arduino average current from active and sleep operation duty cycle.
Calculate resistor divider values for simple Arduino 5V to 3.3V signal level shifting.
Calculate Arduino GPIO current and total port current for LEDs and external loads.
Estimate regulator power dissipation and heating for Arduino boards powered from Vin or DC jack.
Calculate MOSFET gate resistor current, rise time estimate and MCU pin stress for switching circuits.
Calculate MOSFET conduction loss from current, duty cycle and Rds(on).
Estimate MOSFET junction temperature and required heatsink thermal resistance.
Estimate MOSFET switching loss from voltage, current, rise/fall time and switching frequency.
Calculate how MOSFET Rds(on) affects voltage drop, conduction loss and heating.
Estimate MOSFET gate drive current and switching time from total gate charge.
Estimate how PWM frequency affects MOSFET switching loss and gate drive current.
Calculate non-inverting op-amp gain from feedback and ground resistors.
Calculate inverting op-amp gain and output voltage from input and feedback resistors.
Estimate closed-loop bandwidth from gain bandwidth product and circuit gain.
Calculate minimum slew rate needed for sine wave output amplitude and frequency.
Estimate output error caused by input offset voltage and amplifier gain.
Calculate RC low-pass filter cutoff frequency for op-amp input or feedback filtering.
Estimate voltage error caused by op-amp input bias current and source resistance.
This calculator is used for quick electronics engineering estimates, formula checks and early circuit design decisions.
The result is based on the displayed formula and input values. Real hardware can be affected by tolerances, temperature, layout and component limitations.
Use it as an engineering estimate. Always verify final production designs with datasheets, simulations, manufacturer recommendations and measurements.
Estimate PCB microstrip trace impedance.
Estimate PCB stripline impedance.
Estimate LoRa link margin.
Estimate WiFi link margin.
Vertical, horizontal, circular and cross polarization explained.
Electronics Calculators is an engineering topic related to rf design. It helps designers estimate values, avoid common mistakes and choose practical design parameters.
Real results differ because of tolerances, temperature, PCB layout, parasitics, cable losses, power supply behavior and measurement conditions.
Use formulas and calculators as a starting point, then verify with datasheets, simulations, prototypes and real measurements.
Range depends on antenna design, frequency, link budget, path loss, cable loss, installation height, interference and receiver sensitivity.
Yes. RF performance changes with enclosure material, ground plane, placement, nearby objects and installation height.
Estimate RF coax cable loss from attenuation and cable length.
Estimate LoRa received power and link margin.
Calculate free-space RF path loss.
Estimate WiFi received power and link margin.
Estimate PCB microstrip RF trace impedance.