Reactive Power Converter

Supports precise conversion between 5 reactive energy units, including volt-ampere reactive hour, kilovolt-ampere reactive hour, and megavolt-ampere reactive hour, suitable for power engineering.

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Speed and Stability: Processing speed depends on your device and browser. For large batch work, the desktop version may be more stable.

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Tool Usage

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Set first, then process

Select a calculation method, enter values, units, and precision, then click Start conversion. Results will be summarized in all reactive energy units in the next step.

Input valueDecimals and scientific notation supported

Source unit

Main result unit

Reactive power Q

Power unit

Runtime

Time unit

Main result unit

Active energy

Active energy unit

Power factor cosφ0 to 1

Reactive direction

Main result unit

Display precision

Number format

Copy format

Sample data

Quick values

Main result

Waiting to convert

VARh base value-

Current mode-

Main result unit-

Copy & export

Click any result item to copy that result.

Batch text conversion

One value per line. Use “value unit”. If no unit is entered, the default source unit is used. Only the first 20 items are shown; copy and export include all results.

Batch data

Default source unit

Target unit

Batch results

Original input	Detected value	Source unit	Target result	VARh base value
Click Batch convert

Formula & unit reference

Unit conversion1 kVARh = 1000 VARh；1 MVARh = 1000 kVARh；1 GVARh = 1000 MVARh。

Reactive power and timeReactive energy = reactive power Q × time t, e.g. 150 kVAR × 8 h = 1200 kVARh.

Power factor estimateQh = active energy × tan(arccos(cosφ)), suitable for estimating reactive energy of inductive or capacitive loads.

Power meteringkVARh is commonly used for business electricity use, distribution room metering, power factor assessment, and reactive compensation accounting.

Compensation analysisMonthly kVARh, operating hours, and target power factor can help estimate the compensation capacity range.

Result precisionFor very large or small results, switch to scientific or engineering notation for easier records and tables.

Instructions

Software Usage Instructions

Select the calculation method: In “Set Parameters,” choose “Unit Conversion,” “Power × Time,” or “Power Factor Estimation.” For simple unit conversions, use Unit Conversion.
Enter values and units: Enter the reactive energy value and select the original unit and primary result unit; if using Power × Time, enter the reactive power and operating duration; if using Power Factor Estimation, enter the active energy, power factor, and reactive direction.
Set the display format: Choose the display precision, number format, and copy format as needed. Standard numbers, scientific notation, and engineering notation are supported.
Use sample data: Click examples such as meter readings, substation monthly reports, equipment operation, and power factor to quickly view calculation results for different scenarios.
Start conversion: Click “Start Conversion, Go to Next Step,” and the tool will display the primary result, VARh base value, and results for all units.
Copy or export results: You can copy the primary result, copy all results, or export a CSV file for easy organization into power metering sheets and operation records.
Batch conversion: In “Batch and Reference,” enter one data item per line, such as “250 kVARh” or just a value; batch results can be copied or exported as CSV.
Save settings: Click “Save Settings” to retain commonly used units, precision, and copy format for future processing with the same parameters.

Frequently Asked Questions

A: Reactive energy is the energy in an AC power system related to the establishment and maintenance of magnetic and electric fields. Common units are VARh or kVARh. It is not directly converted into useful work, but it affects voltage stability, line losses, equipment capacity, and power factor assessment.

A: Reactive energy units are converted in powers of one thousand: 1 kVARh = 1000 VARh, 1 MVARh = 1000 kVARh, 1 GVARh = 1000 MVARh; mVARh represents one-thousandth of a VARh.

A: Use this mode when the reactive power Q and operating duration of a device or system are known. The calculation is: reactive energy = reactive power × time. For example, 150 kVAR operating for 8 hours corresponds to 1200 kVARh.

A: This mode estimates reactive energy based on active energy and power factor, using the relationship Qh = active energy × tan(arccos(cosφ)). The input power factor should be greater than 0 and no more than 1, and the lagging or leading reactive direction should be selected according to the load type.

A: In power factor estimation, if “Leading, capacitive load” is selected, the tool uses a negative value to indicate the capacitive reactive direction; when “Lagging, inductive load” is selected, the result is usually shown as a positive value. The positive or negative sign is used to distinguish the reactive direction.

A: Enter one item per line. The “value unit” format is supported, such as 1000 VARh, 250 kVARh, and 1.2 MVARh. If no unit is entered, the default source unit set in the batch area will be used.

A: kWh represents active energy and is used to measure electrical energy that performs actual work; kVARh represents reactive energy and is used to measure the accumulated amount of reactive exchange in AC systems. Both are electric energy metering data, but their meanings and uses are different.

A: The conversion results can be used for organizing operating records, monthly electricity consumption analysis, and preliminary estimates of compensation capacity. Actual reactive power compensation design should also be verified based on the load curve, transformer capacity, on-site measurement data, target power factor, and relevant standards.

Reactive Power Converter

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Tool Usage

Copy & export

Instructions

Software Usage Instructions

Frequently Asked Questions

Q: What is reactive energy?

Q: How do you convert between VARh, kVARh, and MVARh?

Q: What scenarios is Power × Time mode suitable for?

Q: What should I note about power factor estimation mode?

Q: Why might the result be negative?

Q: What input formats are supported for batch conversion?

Q: What is the difference between kVARh and kWh?

Q: Can the conversion results be used for reactive power compensation design?

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