UPS size calculator
Use our ups size calculator to calculate accurate size and measurement values instantly.
Calculator
Estimate required apparent power rating from voltage, current, and power factor.
Formula: Single-phase kVA = V x I / 1000; Three-phase kVA = sqrt(3) x V x I / 1000
What each field means
- Voltage (V): Enter a valid value for this field.
- Current (A): Enter a valid value for this field.
- System Phase: Enter a valid value for this field.
- Power Factor: Example: 0.8
Estimated Generator Size (kVA)
Your result will appear here.
About UPS size calculator
The UPS size calculator helps you estimate cable and electrical values quickly using consistent assumptions and practical calculation rules.
Formula Explanation
Single-phase kVA = V x I / 1000; Three-phase kVA = sqrt(3) x V x I / 1000
Inputs You Need
- Required measurement values relevant to this calculator
- Unit selection: Voltage (V), Current (A), System Phase, Power Factor
- Optional tolerance, safety, or scenario values if applicable
Step-by-Step Usage
- Enter your known values in the calculator fields.
- Select units and options that match your scenario.
- Click Calculate to generate your output.
- Copy, save, or share the result for later reference.
Example
Run the tool with realistic values from your use case and compare the output against expected ranges for cable and electrical calculations.
Method Sources
Frequently Asked Questions
Is this UPS size calculator accurate?
Yes, when correct inputs and units are provided.
Which units does this calculator support?
This tool is optimized for Voltage (V), Current (A), System Phase, Power Factor.
Can I use this calculator on mobile?
Yes, the form is optimized for touch inputs and smaller screens.