Electrical Load, Ampere & MCB Size Calculator

Convert total load in watts to ampere and get a suggested MCB size for single phase or three phase supply.

Doing the arithmetic by hand takes time and invites small mistakes. Electrical Load, Ampere & MCB Size Calculator takes total load, supply, and power factor and gives an instant result you can recalculate with different values.

How to Find Current and MCB

Enter the total load in watts, choose the supply and power factor and click Current aur MCB Nikalein.

How is current calculated?

Single phase: watt ÷ (230 × power factor). Three phase: watt ÷ (√3 × 415 × power factor).

Why add 25%?

A safety margin so the MCB does not trip on normal load.

Is this enough for wiring?

No, wire size and protection must be decided by a licensed electrician.

What is a standard MCB size?

6, 10, 16, 20, 25, 32, 40, 50, 63 A and so on.

About this calculator

Convert total load in watts to ampere and get a suggested MCB size for single phase or three phase supply. Electrical Load, Ampere & MCB Size Calculator replaces manual arithmetic with an instant, repeatable answer, lets you change one value and see the effect straight away, and reduces the chance of small mistakes in long calculations.

How to use it

Enter total load, supply, and power factor, then adjust the options so they match what you need, then click “Current aur MCB Nikalein”, and finally read the result and try other numbers to compare.

Worked scenario

A quote arrives from a supplier and Electrical Load, Ampere & MCB Size Calculator helps you check whether the figures add up.

Things to keep in mind

The answer is only as good as the numbers you enter, so double-check units and decimals. Use the result as a guide and confirm important figures with an official or professional source.

Electrical Load, Ampere & MCB Size Calculator works inside your browser, so what you type or select here is not sent to our server for processing.

At a glance

  • Category: Calculators
  • Type: calculator
  • You enter: total load, supply, and power factor
  • You get: an instant result you can recalculate with different values
  • Works on: phones, tablets and computers, directly in the browser

Quick tips

  • Use the answer as a guide and confirm important numbers with an official source.
  • Double-check units and decimal points before you press calculate.
  • Try two or three different values to see how sensitive the result is.

This page is meant for anyone looking up “electrical load calculator”, “watt to ampere”, and “load calculation”. Whatever the exact wording, the need is usually the same: a quick, reliable result without extra software.

Frequently asked questions

What does Electrical Load, Ampere & MCB Size Calculator do?

It is a calculator that takes your input on this page and gives you an instant result you can recalculate with different values.

What do I need to enter?

You will work with total load, supply, and power factor.

Is Electrical Load, Ampere & MCB Size Calculator what I need if I am searching for “electrical load calculator”?

Yes, if you want a quick answer without installing anything. Searches like this usually come from someone with exactly that need, and the fields on this page are built for it.

Is this tool what I need if I am searching for “watt to ampere”?

It can be. Check the fields on this page and the result it gives; if they match what you are trying to do, you are in the right place.

Is my input sent to a server?

No. This tool runs inside your browser, so what you type or select is not sent to our server for processing.

Does it work on a phone?

Yes. The page adapts to phone, tablet and computer screens, so you can use it wherever is convenient.

How accurate is the result?

It follows the standard formula for the values you enter, but treat it as an estimate. Rules and rates differ between institutions, so confirm important figures with the official source.

You might also try EMI Calculator, kW, kVA & Ampere Converter, and Truck Load Calculator.

Further reading from trusted sources

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Last updated: 10 Nov 2026 • 100% free • Mobile friendly

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