PowerAvailable
Power Calculator
Calculate electrical power, current, or voltage with automatic engineering-unit conversion.
Calculator category
Power Calculators
Power calculators support early-stage power electronics design, regulator selection, converter sizing, and thermal troubleshooting. They help hardware engineers estimate dissipation, duty cycle, ripple-related values, and component stress before committing to schematic and PCB design decisions.
Available Calculators
10
Engineering Applications
4
Calculators
Each listed tool links to a working calculator with engineering inputs, formulas, examples, notes, and related resources.
PowerAvailable
Power Factor Calculator
Calculate AC real, reactive, and apparent power with power factor and phase angle.
PowerAvailable
Inrush Current Calculator
Calculate peak startup current, required limiting resistance, and capacitor charge time.
PowerAvailable
Fuse Size Calculator
Estimate minimum and standard fuse ratings from load current, safety margin, and inrush.
PowerAvailable
Voltage Drop Calculator
Estimate wire resistance, voltage drop, load voltage, and cable power loss.
PowerAvailable
Voltage Current Resistance Calculator
Calculate voltage, current, resistance, and power relationships for power-stage and supply calculations.
PowerAvailable
Power Supply Current Calculator
Calculate input current, output current, and recommended supply rating with safety margin.
PowerAvailable
Power Dissipation Calculator
Calculate watt loss from V/I/R combinations and check component rating and derating margin.
PowerAvailable
Efficiency Calculator
Calculate efficiency, input power, output power, loss, and performance status.
PowerAvailable
Battery Capacity Runtime Calculator
Estimate simple runtime, required capacity, or allowable load current with unit conversion.
How to Use These Calculators
Start From the Engineering Question
Choose the calculator that matches the decision you need to make: decode a component marking, size a value, check a frequency response, estimate loss, or verify a safety margin. A category page is useful only when it helps you reach a working tool, so this page lists released calculators only.
Check Units and Assumptions
Calculator results depend on unit choices, idealized formulas, tolerance, temperature, frequency range, and component limitations. Review the formula and engineering notes on each calculator page before using the result in a schematic, BOM, or PCB layout.
Validate Against Real Parts
Use the calculated value as a design reference, then confirm it against datasheets, derating curves, layout parasitics, measurement conditions, and manufacturer limits. The related guides below provide background when a calculation needs more context.
Engineering Applications
Linear Regulators
Buck Converter
Boost Converter
Thermal Design
Related Engineering Guides
Engineering Guide
AC Power Factor, Supply Current, Voltage Drop, and Runtime Budgeting
Build source-to-load budgets using real and apparent power, power factor, supply current, conversion efficiency, voltage drop, usable battery energy, and runtime derating.
19 min · Intermediate
Engineering Guide
Understanding Electrical Power
Learn the fundamentals of electrical power, including voltage, current, resistance, watts, energy, Ohm's law, DC and AC power, efficiency, power dissipation, and practical calculations.
18 min · Beginner
Engineering Guide
Power Dissipation and Component Power Ratings
Learn how to calculate power dissipation and choose safe component power ratings for resistors, diodes, BJTs, MOSFETs, regulators, PCB traces, and power supplies using thermal limits, derating, and real operating conditions.
20 min · Intermediate
Engineering Guide
Inrush Current, Fuse Sizing, and Protection Coordination
Design for startup inrush and select fuses using load current, pulse duration, time-current curves, I²t, derating, voltage rating, breaking capacity, and fault coordination.
18 min · Intermediate
Related categories
MOSFETs
MOSFET calculators for switching loss, conduction loss, gate drive, thermal checks, and power hardware design.
Open →Inductors
Inductor calculators for converter design, LC resonance, EMI filtering, RF circuits, and stored energy.
Open →Capacitors
Capacitor calculators for RC timing, filtering, signal coupling, energy storage, and component selection.
Open →