Energy Calculators

Calculate electricity cost for electrical and energy planning.

Calculate watts to amps for electrical and energy planning.

Estimate battery runtime from capacity, voltage and device power demand.

Ohm’s law links voltage, current and resistance in a simple resistive circuit.

Estimates the drop from conductor properties, length and current.

Translates the band sequence into resistance so components can be identified quickly without memorizing every code.

Resistors connected in parallel share the same voltage while the current splits among branches.

Electrical power describes the rate at which electrical energy is transferred or used.

Kinetic energy is the energy an object has because it is moving.

Calculate frequency and wavelength for electrical and energy planning.

A capacitor stores electrical energy in an electric field between its plates.

Battery runtime estimates how long a battery can support a load from stored energy and power demand.

Power factor compares real power with apparent power in an AC circuit.

A transformer changes AC voltage and current according to the turns ratio between its windings.

Finds the output voltage produced by two or more resistors connected in series across a supply.

Estimates the series resistance needed to limit current through a light-emitting diode from a DC supply.

Adds resistor values connected end-to-end in a single current path.

Capacitors connected in parallel share the same voltage while their effective plate area is increased.

Capacitors connected in series carry the same magnitude of charge while the total voltage is divided among them.

Converts power used over time into energy, commonly expressed in watt-hours or kilowatt-hours.

Calculate battery charging time for electrical and energy planning.

Calculate solar panel for electrical and energy planning.

An inverter converts DC battery or solar power into AC power for appliances.

Calculate battery capacity for electrical and energy planning.

Helps distinguish watts, volt-amperes and three-phase relationships.

The RC time constant describes how quickly a resistor-capacitor circuit charges or discharges.

Is useful in filters, coupling networks and AC circuit analysis.

Inductive reactance describes the frequency-dependent opposition an ideal inductor presents to alternating current.

Gives the ideal natural resonance from inductance and capacitance.

Calculate battery series parallel for electrical and energy planning.

Changes rates of repetition between hertz, kilohertz, megahertz, gigahertz and other supported frequency units.

Calculate solar battery bank for electrical and energy planning.

Estimates how long a generator may operate from a known fuel quantity at a given fuel-consumption rate.

Estimates the electrical capacity needed to run a group of appliances or equipment.

Battery C-rate expresses charge or discharge current relative to battery capacity.

Calculate lighting watts for electrical and energy planning.

Estimates how long an uninterruptible power supply may support a connected load during a power outage.

Estimates how quickly a heater can raise a quantity of water from one temperature to another.

Lumens measure the total visible light output of a lamp or fixture.

Calculate solar panel output for electrical and energy planning.

Estimates electricity consumption and cost from appliance power, operating time and electricity tariff.

Connects battery charge capacity with energy capacity using system voltage.

Determines air speed from volumetric airflow and duct cross-sectional area.

Finds the cross-sectional flow area of a circular duct from its internal diameter.

Calculate ventilation airflow for electrical and energy planning.

Calculate battery charge time for electrical and energy planning.

Estimates how long electricity savings may take to recover the upfront net cost of a solar installation.