kVA, kW and Amps Calculator

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Convert kVA to kW, kW to kVA, kVA to amps or amps to kVA for single-phase and three-phase AC systems using voltage and power factor.

Inputs

Choose the conversion

Conversion

Apparent power (kVA)

Electrical system

Voltage and phase affect current, while power factor links kW and kVA.

Power factor

Power factor is required only when converting between real power (kW) and apparent power (kVA).

How to use this calculator: kVA, kW and Amps Calculator

Convert kVA to kW, kW to kVA, kVA to amps or amps to kVA for single-phase and three-phase AC systems using voltage and power factor. The example below is calculated by this page's real engine from the displayed inputs.

1Select kVA to kW, kW to kVA, kVA to amps, or amps to kVA.
2Use the equipment nameplate or design value, keeping kVA, kW and A in the units shown beside the field.
3For current conversions choose single phase or three phase. For three phase, enter line-to-line voltage such as 400 V or 415 V.
4Use the measured or nameplate power factor. If it is unknown, treat the default only as an estimate.
5Read the step-by-step working and verify the result against the transformer, generator, inverter, breaker or cable rating.

Input guide and example values

Use values from the same measurement basis and time period. Conditional fields appear only when the related option is selected.

Input	Example value	Why it matters
Conversion	kVA to kW	Select the option that matches the real installation or scenario.
Apparent power	100 kVA	Measured or known apparent power used by the calculation engine.
Power factor	0.8	Power factor is required only when converting between real power (kW) and apparent power (kVA).

Formula, derivation and worked example

kW and kVA are not interchangeable unless the power factor is known. kW is useful real power; kVA is the voltage-current product used for equipment ratings. Current also depends on whether the supply is single phase or three phase and, for three phase, the entered voltage must be line-to-line.

kW = kVA × power factor

kVA = kW / power factor

Single phase: I = kVA × 1000 / V

Three phase: I = kVA × 1000 / (√3 × VLL)

Single phase: kVA = V × I / 1000; three phase: kVA = √3 × VLL × I / 1000

Substitution steps

1. Real power
kW = kVA × PF
= 100 × 0.8 = 80 kW

Computed example results

Apparent power: 100 kVA
Real power: 80 kW
Power factor: 0.8

Understanding the result

Read the main result together with supporting checks, assumptions, limits and intermediate values.

For a manual check, repeat the first equation, confirm the units and change one input at a time.

Common mistakes when using kVA, kW and Amps Calculator

Do not mix units for Apparent power (kVA). A unit mismatch changes the input magnitude even when the typed number looks reasonable.
Do not leave Conversion on the default choice unless that choice matches the real scenario; the selected option can change the calculation path or factor.
Do not replace the displayed kW = kVA × power factor relationship with a different convention without also changing the underlying assumptions; compare like-for-like methods when checking the result.
Do not treat Apparent power = 100 kVA from the worked example as a universal answer. It belongs to the displayed example inputs and must be recalculated for the actual case.

When the kVA, kW and Amps Calculator is useful

kVA, kW and Amps Calculator is designed for cases where Conversion, Apparent power, Power factor are known and you need Apparent power, Real power, Power factor. The page keeps the live calculator, calculation method and worked example together so the result can be checked instead of treated as a black-box number.

Use the calculator for the scope described by its inputs and notes. The displayed method is kW = kVA × power factor. If the real project or decision needs factors that are not represented here, treat the result as an estimate and add the missing checks separately.

Conversion and Apparent power: what changes the answer

The worked example uses Conversion = kVA to kW, Apparent power = 100 kVA, Power factor = 0.8. With those values, Apparent power is 100 kVA. Changing an input should be interpreted according to that field's unit, range, option and hint rather than by the number alone.

For this calculator, the main input roles are: Conversion: Select the option that matches the real installation or scenario. Available choices include kVA to kW, kW to kVA, kVA to amps, Amps to kVA. Apparent power (kVA): Measured or known apparent power used by the calculation engine. Power factor: Power factor is required only when converting between real power (kW) and apparent power (kVA).

How to sanity-check a kVA, kW and Amps Calculator result

Start by confirming the entered values and units, then compare the substituted working with the displayed formula or calculation steps. Pay particular attention to Apparent power, because it is the first worked-example output shown by the live engine.

Finally, compare the result with the assumptions, warnings and related calculators on this page. A nearby calculator can be useful as a cross-check when it measures the same workflow from a different input or output direction.

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Watts to Amps Calculator is directly connected from kVA, kW and Amps Calculator as a source-defined continuation or comparison.

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Standards, source trail and limitations

References show the method used. Check the current local edition, amendments and project specification before a regulated decision.

Formula

kW = kVA × power factor
kVA = kW / power factor
Single phase: I = kVA × 1000 / V
Three phase: I = kVA × 1000 / (√3 × VLL)
Single phase: kVA = V × I / 1000; three phase: kVA = √3 × VLL × I / 1000

Formulas explained

kW = kVA × PF

kVA is the total apparent power carried by the supply. Power factor is the fraction converted into useful real power, so multiplying gives kW.

kW: Real power that performs useful work.
kVA: Apparent power used to rate transformers, generators and inverters.
PF: Power factor from 0 to 1.

I = kVA × 1000 / (√3 × VLL)

For a balanced three-phase system, apparent power equals √3 times line voltage times line current. Rearranging gives the current in each line.

I: Line current in amperes.
VLL: Line-to-line voltage in volts.
√3: Three-phase constant, approximately 1.732.

Power factor is not used in the direct kVA-to-amps equation because kVA already represents apparent power.

Worked example

1Convert 100 kVA at 0.80 power factor on a 415 V three-phase supply.
2Real power = 100 × 0.80 = 80 kW.
3Line current = 100,000 / (1.732 × 415) = 139.12 A.

Assumptions

Balanced sinusoidal AC supply.
Three-phase voltage is line-to-line RMS voltage.

Warnings

Do not use kW alone to size a transformer or generator when the load power factor is below 1.

Standards & references

IEC 60038
IEC 60364
IEEE 1459

Frequently asked questions

How many kW is 1 kVA?

kW equals kVA multiplied by power factor. At PF 1.0, 1 kVA is 1 kW; at PF 0.8, 1 kVA is 0.8 kW.

How many amps is 100 kVA at 415 V three phase?

About 139.1 A: 100,000 divided by 1.732 × 415.

Does power factor affect kVA to amps?

No. Direct kVA-to-amps conversion uses apparent power, voltage and phase. Power factor is needed when converting kVA to kW.

Should I enter 230 V or 415 V for three phase?

Enter the line-to-line voltage shown for the three-phase system, commonly 400 V or 415 V in India.

What inputs does the kVA, kW and Amps Calculator use?

It uses Conversion, Apparent power, and Power factor. Follow the unit printed for each field and choose any selectable option to match the real scenario.

What does the kVA, kW and Amps Calculator calculate?

It calculates Apparent power, Real power, and Power factor. With the displayed default inputs, Apparent power is 100 kVA.

Which formula does the kVA, kW and Amps Calculator use?

The primary relationship is kW = kVA × power factor. The page also shows substituted values and calculation steps so the result can be checked independently.

How can I verify a kVA, kW and Amps Calculator result?

First verify the units for Conversion, Apparent power, and Power factor. Then compare the substituted formula steps with Apparent power and its displayed precision.

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