Engineer Calculators
A set of calculators for everyday circuit and power IC design, running directly in your browser. Results update as you type, and copying the link shares your exact inputs.
Enter values with SI prefixes, e.g. 4k7 · 4.7u · 1.2M · 10K
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Power design 6 tools
Feedback Divider
Find standard Rtop/Rbot pairs for PMIC and switching regulator output voltage, with min and max output within tolerance.
PMIC essentialBuck Converter
Standard inductor across the input range, peak and RMS current, DCM boundary, loss estimate and current waveform.
Boost Converter
Standard inductor, input and peak current, DCM boundary, output ripple and losses across the input range.
LDO Loss & Junction Temp
Power loss, junction temperature, efficiency and dropout headroom for a linear regulator (LDO).
Efficiency & Loss
Efficiency and power loss from measured input and output voltage and current.
Battery Life
Runtime from battery capacity and average current, and the average current of a duty-cycled device.
Basic circuits 6 tools
Ohm's Law & Power
Enter any two of voltage, current, resistance and power to solve for the other two.
Series & Parallel R
Series and parallel equivalent of several resistors, and the closest two-resistor combination for a target value.
Voltage Divider
Output voltage with load effect, power dissipation and standard resistor values for a two-resistor divider.
LED Resistor
Series resistor and resistor power rating from supply voltage, LED forward voltage and current.
Resistor Color Code
Convert 4-band and 5-band resistor colors to a value, and find the color bands for a value.
RC Filter
Cutoff frequency and time constant of an RC low-pass filter, and the resistor needed for a target cutoff.
Signal & PCB 2 tools
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