Apparent Power Converter

Supports precise conversion between 5 apparent power units: volt-ampere, millivolt-ampere, kilovolt-ampere, megavolt-ampere, and gigavolt-ampere. Suitable for power engineering design

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Tool Usage

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Set the value, unit, and display precision first, then view results. For engineering help, switch to voltage/current or batch conversion. All calculations are done on this page.

1Set Conversion Parameters

Supports decimals, load capacity, and scientific notation

Apparent Power Value Input Unit

Main Result Unit Decimal Places Display Format

2View Conversion Results

Click any result to copy it

Main result

Enter a value to convert automatically

1Select calculation mode

Common formulas are built in. Set parameters, then calculate.

Single-phase S=U x ICalculate VA/kVA from voltage and current Three-phase S=sqrt(3) x U x ICalculate capacity from line voltage and current kW and kVAConvert by power factor

Voltage U Voltage unit Current I (A)

Line voltage U Voltage unit Line current I (A)

Known power Known unit Power factor cosφ

Capacity margin Suggested output unit Standard capacity reference

2Engineering result

Capacity suggestions are for reference only

Apparent power-

Capacity with margin-

Reference standard capacity-

Process notes

1Paste batch data

One value per line; units allowed. If omitted, the default unit below is used

Default input unit Batch output unit Result separator

2Batch results

Preview shows up to 20 rows; copy and download include all results

Please enter data or load example data first

Copyable text

1Conversion relationship

Apparent power units use decimal conversion

millivolt-ampere1 mVA = 0.001 VA

volt-ampere1 VA = 1 V x 1 A

kilovolt-ampere1 kVA = 1000 VA

megavolt-ampere1 MVA = 1000 kVA = 1000000 VA

gigavolt-ampere1 GVA = 1000 MVA = 1000000000 VA

2Common references

Check against actual loads and applicable standards

Small electronic devicesmVA to tens of VA, suitable for estimating sensors, power adapters, etc.

Home and office equipmentTens of VA to several kVA, common in UPS, lighting, and small appliances

Distribution transformerTens of kVA to thousands of kVA, often used for building and factory distribution

Large power equipmentMVA class and above, common in large transformers, generators, and grid scenarios

3Formula quick reference

Confirm single-phase, three-phase, or power factor, then calculate

Single-phaseS(VA) = U(V) x I(A)

Three-phaseS(VA) = sqrt(3) x U线(V) x I线(A)

Active powerP(kW) = S(kVA) x cosφ

Apparent powerS(kVA) = P(kW) / cosφ

Reactive powerQ = sqrt(S² - P²)

Instructions

Software Usage Instructions

Set conversion parameters: Enter the apparent power value and select mVA, VA, kVA, MVA, or GVA as the input unit.
Adjust display options: Select the primary result unit, decimal places, and display format, suitable for engineering documents, equipment nameplates, and table organization.
View and copy results: The results area displays values in each unit in sync. Click an individual item to copy it, or use “Copy All Results” or “Export CSV”.
Engineering calculation: In “Engineering Calculation”, select single-phase, three-phase, or power factor mode, enter voltage, current, kW, kVA, or cosφ, and view apparent power, reserve capacity, and reference capacity.
Batch conversion: In “Batch Conversion”, paste data line by line with units if needed; entries without units are processed using the default unit, and results can be copied or downloaded as CSV.
Save settings: Frequently used units, display precision, reserve ratio, and batch format can be saved for continued use next time.

FAQ

A: Apparent power is represented by the symbol S, usually in VA or kVA. It represents the product of the RMS voltage and RMS current in an AC circuit and is a commonly used parameter for equipment capacity, line load, and transformer selection.

A: Apparent power units are converted by factors of 1000: 1kVA=1000VA, 1MVA=1000kVA, 1GVA=1000MVA, 1VA=1000mVA.

A: kVA represents apparent power, while kW represents active power. They are related by the power factor: P(kW)=S(kVA)×cosφ, S(kVA)=P(kW)/cosφ.

A: When calculating a three-phase system using line voltage and line current, the phase relationship between the three phases must be considered, so the formula is S=sqrt(3)×U line×I line.

A: Usually, a certain margin is added based on the calculated load capacity, such as 10%, 20%, or 30%. The actual value should be determined based on the load type, starting current, operating time, environmental conditions, and project specifications.

A: One value per line is supported, such as “500 VA”, “1.5 kVA”, or “0.8 MVA”. If no unit is specified, the default input unit will be used. Results can be copied or exported as CSV.

A: When a value is very large or very small, the tool uses scientific notation for easier display. For example, 5e-7 represents 0.0000005. You can switch between standard numbers and scientific notation in the display format.