# Transformer Sizing Calculator

Most interesting and easy to use calculator tool that determines the required kVA rating of a transformer for a given load. As it is a web based tool you can use it from anywhere. To use this calculator, all you need to do is give the inputs like current, voltage, transformer type in the required fields of inputs and then click on the calculate button. By that you will get instant results easily without any issues.

Transformer Sizing Calculator: Feeling difficult to determine the transformer kVA? If so, The tool that we have provided for you will help you a lot. Just by giving some inputs and by tapping on the calculate button you will get the answer. Continue reading to learn about what a transformer is, and also formula, and also know how to calculate the transformer kVA easily. If you want after calculating it manually you can check the answers with our calculator tool.

## What is a Transformer?

A transformer is used to increase or decrease the voltage levels when a source voltage differs from the load voltage. When you are sizing a transformer you need to know te kVA that your machine requires. This transformer take the input voltage and provides different output voltage. Transformer kVA is calculated mainly based on voltage and current.

Mathematical Calculation Formula for kVA

If you want to calculate kvA at least you need to know voltage(V) requirement and also the current(I).

Single-phase transformer formula,

kVA = (V x I) /1000.

Three-phase transformer formula,

kVA = (√3 x V x I) /1000 = (1.732 x V x I) /1000.

where,

V = Voltage

I = Current.

### How to Calculate Transformer kVA?

Here are the steps to calculate the transformer kVA easily that are given below. Go through the steps carefully.

• Consider the voltage and current values as per given in the problem.
• Now, after that apply the transformer kVA formula.
• Substitute the values and simplify them.
• Finally, get the answer of transformer kVA.

### Example Problems to Find Transformer kVA

Question: If the current is 23 A and the voltage is 50 v then calculate the transformer kva for single phase and three phase?

Solution:

Given,

voltage (v) = 50v

current(I) = 23 A

Apply the formula of single phase and three phase,

Single-phase transformer formula,

kVA = (V x I) /1000.

= (50 x 23)/1000.

= 1.15 kVA

Three-phase transformer formula,

kVA = (√3 x V x I) /1000

= (1.732 x V x I) /1000.

= (1.732 x 50 x 23 ) / 1000.

= 1.992kVA

Therefore, the transformer kva for single phase and three phase is 1.15 kVA & 1.992kVA.

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### FAQs on Transformer kVA Calculator

1. How do you calculate transformer size?

Transformer size can be calculated by the formula,

Single-phase transformer formula,

kVA = (V x I) /1000.

Three-phase transformer formula,

kVA = (√3 x V x I) /1000 = (1.732 x V x I) /1000.

2. What are the steps to use transformer sizing calculator?

Transformer sizing calculator can be used by using the below steps.

• Take the inputs and fill them in the input fields.
• After that, click on the calculate button.
• Finally, get the answer easily in seconds.

3. How many amps that 15 kVA transformer can handle?

15 kVA transformer can handle 41.7 amp at 208 v and 36.1 amps at 240 v.

4. How many transformer kVA do i need to run average home?

To run average home you need atleast 3 KVA to 5 KVA. With this generator power you can run home comfortably.