What is the formula for kWh to kVA?

kVA = kWh / (hours × power factor). First divide kWh by hours to get real power in kW, then divide kW by the power factor to get apparent power in kVA.

What is power factor?

Power factor is the ratio of real power (kW) to apparent power (kVA). It ranges from 0 to 1. A purely resistive load has a power factor of 1. Inductive loads like motors typically have a power factor between 0.7 and 0.95.

Why do I need time to convert kWh to kVA?

kWh is energy (power × time), while kVA is a power measurement. To recover power from energy you must know the time duration over which the energy was consumed.

What is a typical power factor for household appliances?

Most household appliances have a power factor between 0.8 and 1.0. Pure resistive loads such as heaters and incandescent bulbs are close to 1.0, while motors and fluorescent lights can be 0.7 to 0.9.

How is kVA different from kW?

kW (kilowatts) measures real power — the energy actually converted to useful work. kVA (kilovolt-amperes) measures apparent power, which includes reactive power that oscillates between source and load. kVA ≥ kW always.

Kilowatt Hours to kVA Calculator

Convert kilowatt-hours (kWh) to kilovolt-amperes (kVA) by entering energy, time duration, and power factor.

To convert kilowatt hours to kVA, divide kWh by the hours to get kW, then divide by the power factor: kVA = kWh ÷ (hours × PF). kWh is energy and kVA is power, so you need the time period the energy was used over.

Conversion Inputs

Energy (kWh)

Kilowatt-hours consumed or stored

Time (hours)

Duration over which energy was consumed

Power Factor (0.01 – 1.00)

Ratio of real power to apparent power

Result

Fill in the inputs and press Calculate

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Quick answer

Example: 100 kWh used over 8 hours = 12.5 kW; at a 0.85 power factor, 12.5 ÷ 0.85 = 14.71 kVA.

Enter kWh and hours, tap a power factor preset, then copy the kVA.

Summary

This calculator converts energy stored or consumed in kilowatt-hours (kWh) into apparent power measured in kilovolt-amperes (kVA). The conversion requires both a time duration (in hours) and a power factor, since apparent power accounts for the phase difference between voltage and current in AC circuits. It is useful for sizing generators, UPS systems, and transformers based on energy consumption data.

How it works

Enter the energy value in kilowatt-hours (kWh).
Enter the time duration in hours over which that energy was consumed.
Enter the power factor (between 0.01 and 1.00) of the load.
The calculator divides kWh by hours to get real power in kilowatts (kW).
It then divides kW by the power factor to obtain apparent power in kVA.

Use cases

Size a generator or UPS based on monthly energy bill data.
Determine transformer kVA rating from measured kWh consumption.
Convert utility meter readings to apparent power for capacity planning.
Verify that electrical equipment ratings match actual energy usage.
Calculate kVA demand for industrial load analysis.
Help electricians translate energy audit results into equipment specs.

Frequently Asked Questions

Last updated: 2026-05-23 · Reviewed by Nham Vu