Free Welding Calculators

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Heat Input Calculator - Metric

You can use this form to calculate the heat input for ASME IX and ISO 1011-1 standards in Metric units. This form uses the non-waveform controlled method for calculating the heat input. 

Heat Input Calculator - English units

You can use this form to calculate the heat input for AWS standards in English or US customary units. This form uses the non-waveform controlled method for calculating the heat input. 

Carbon Equivalent Calculator

You may enter the values of different elements in the form below to calculate the carbon equivalent value for the standards EN 1011-2 methods A & B and AWS D 1.1. 

The value shown in the EN 1011-2 method A is for carbon manganese steels. The method B is for low alloy steels. 

Preheat Calculator (AWS D1.1)

You may use the other calculators here to determine the heat input and carbon equivalent. Select the other three variables to calculate the preheat temperature.

This calculator uses the hydrogen control method as described in AWS D1.1 - 2020 Annex B.

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