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Here are 4 free online reaction enthalpy reaction calculator websites. These websites let you calculate the enthalpy change in a chemical reaction or the overall enthalpy of the reaction by taking some inputs from you. And the input parameters on some of the websites are different but they yield the same result. All the websites that I have listed in the below post are free to use without creating any account. You just have to specify the parameters like pressure, temperature, change in internal energy, change in volume and some others. After taking the parameters from you, these websites will show you the final result. After calculating the enthalpy change, you can do whatever you want.

In general terms, enthalpy simply means heat. No matter whether it is released or absorbed in a specific chemical reaction, you can always calculate it. In high school, we generally used different formulas to do it, but if you want faster results then, you can use the following websites. You just have to input various parameters to get the enthalpy of a reaction in terms of Joules.

## Enthalpy and Gibbs Free Energy Calculator

Enthalpy and Gibbs Free Energy Calculator is one of the best free reaction enthalpy calculator websites that you can use. I have added it on the top my list because in spite of taking the reaction parameters from you, it directly takes the reactants and products name as the input. There is already a long list of different chemical compounds is and you can choose the ones which are involved in your reaction. After taking the inputs, it immediately tells you the enthalpy of the final reaction in terms of Joules. And not just this, in addition to the enthalpy of reaction, it can also calculate the Gibbs energy from the chosen reactants and products.

After reaching the homepage of this calculator, simply select the reactants and products in your reaction. It lets you choose maximum of 3 products and reactants for you reaction. And if you want to exclude any one then you can do that. After that, just use the different drop downs to select reactants and products. Next, specify the other participant chemicals in the reaction and then you can get the result. Simple as that

## Omni Calculator

Omni Calculator is actually a collection of different calculators. It contains around 300 type of calculators that you can use to do various calculations related to finance, construction, conversion, Physics, Statistics, Mathematics, and of course Chemistry. This website offers an enthalpy calculator that you can use to calculate the overall heat involved in an endothermic or exothermic chemical reaction. Here it takes parameters like change in internal energy, change in volume, and pressure. After that, it calculates the change in the enthalpies of the reaction and then show you the result. And not only this, but there is an advance mode in the calculator as well in which you can enter many other parameters to get the result. To see the advanced options, you will have to expand the interface of the calculator.

Go to the enthalpy calculator page of Omni calculator website and the enter the parameters that it asks as input. It mainly takes the input parameters like change in internal energy, pressure, etc. And as soon as you specify the inputs, it immediately calculates the change in the enthalpy of the reaction. It uses Joules as the unit to indicate the enthalpy and you can use the tool every time in the same way.

## Enthalpy Calculator

Enthalpy Calculator is another reaction enthalpy calculator website that you can use. Just like some websites in this list, it takes input values like internal energy of reactants, internal energy of products, pressure of a system, volume of products, and the volume of reactants. After specifying these details, it calculates the enthalpy of the overall reaction in terms of Joules. You can use the website without creating any account and you can also use the other Thermodynamics related calculators on the website.

To use this tool, you can visit its homepage using the above link. After that, on the main interface of the tool, specify the input parameters like internal energies of products and reactants, pressure of the system, volume of the reactants, etc. After specifying all the input parameters, simply click on the “Calculate Enthalpy” button and it will show you the final enthalpy of the reaction in terms of Joules. You can note down the result and then use it wherever you want.

## Enthalpy Change Calculator

Enthalpy Change Calculator is an extremely simple website that you can try to calculate the enthalpy of reaction easily. It simply helps you calculate the change in enthalpy of a reaction by taking the final enthalpy of the system and the initial enthalpy of a system. When you specify these parameters, it simply yields the result and then you can analyze it and then do whatever you want. However, you can only use this tool if you have the initial and final parameters of the reaction with you. Otherwise you have to calculate those manually and the use them in this tool.

Follow the above URL to reach the home page of this tool and enter the parameters that it asks. After specifying the initial and final parameters of the system you can hit the “Calculate” button. It will immediately show you the final change in the enthalpy of a reaction in terms of Joules. You can use the tool in the same way and any number of times. Also, the website has other tools as well that you can try to calculate the Thermodynamics related calculations. For example, if you want to calculate the Gibbs energy for a reaction then you can do that.

### Final words

These are the best free websites that you can use to calculate the enthalpy of a reaction. All these websites are very simple and just take a few parameters from you to show you the final result. Also, some of the websites are quite powerful and they offer you simple ways to calculate the enthalpy of a reaction. If you are a high school student or in Chemistry related field then you can try these websites to help you while studying some chemical reactions. So, if you are looking for some free reaction enthalpy calculators, then give a try to any of the above mentioned websites.

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