Power and energy calculators
Move from electrical operating points into dissipation, resistor wattage, stored capacitor energy, stored inductor energy, and supporting unit conversions.
Choose from the power or energy task
This hub uses the existing calculators that already support power, stored energy, and related unit checks. Future thermal calculators can extend this workflow without changing the page purpose.
Resistor Power and Wattage Calculator
Calculate resistor dissipation, design margin, and practical wattage rating.
When to use it: Use after a voltage, current, divider, pull-up, or LED calculation produces a resistor dissipation value.
LED Series Resistor Calculator
Calculate LED series resistance and resistor power for a single current-limited LED.
When to use it: Use for indicator LED current limiting and the first resistor dissipation check.
Capacitor Energy Calculator
Calculate stored capacitor energy and charge from capacitance and voltage.
When to use it: Use for hold-up, discharge, stored-energy, and energy-availability checks.
Inductor Energy Calculator
Calculate stored magnetic energy from inductance and current.
When to use it: Use when an inductor current may be interrupted, clamped, or transferred elsewhere in the circuit.
Engineering Conversion Calculator
Convert dB, dBm, RMS values, SI prefixes, dimensions, and other electronics units.
When to use it: Use when power, energy, amplitude, or unit conversions support the design calculation.
Common power and energy workflows
Use these paths when the result affects component rating, stored energy, discharge behaviour, or the next design review.
Resistive power check
Stored capacitor energy
Stored inductor energy
Engineering explainers
Use these guides when the result affects stored energy, thermal margin, or a follow-on stress review.
Capacitor energy and hold-up time
Understand usable capacitor energy, voltage range, and hold-up limitations.
Inductor energy and clamp paths
Check peak-current energy, saturation risk, and interrupted-current energy paths.
Regulator power dissipation and thermal rise
Estimate regulator heat and understand first-pass thermal-rise limits.