Future Simple (will+infinitive) versus to be going to+infinitive:

Will + infinitive
Be going to + infinitive

A decision at the moment of speaking:

Julie: There's no milk.
John: Really? In that case, I
'll go and get some.

A decision before the moment of speaking:

Julie: There's no milk.
John: I know. I
'm going to go and get some when this TV programme finishes.

A prediction based on opinion:

I think the Conservatives will win the next election.

A prediction based on visual evidence or on something you can hear:

The Conservatives
are going to win the election. They already have most of the votes.
Look at the sky! It’s overcast. It’s going to rain.

Both Will and Going to can be used for making future predictions without having a real difference in meaning:
I think it will be foggy tomorrow. = I think it is going to be foggy tomorrow.

A future fact:

The sun will rise tomorrow.

To be going to is used to describe something is about to happen
Get back! The bomb is going to explode.

For promises ; offers; threats; refusals; requests:
'll help you tomorrow if you like.
I‘ll take you to the airport tomorrow.
I‘ll tell your parents what you did.
No, I won’t cook your dinner, you can cook it yourself.
Will you bring some more water, please?

Conditional type I:
If+simple present+future simple
If it’s sunny next week, we’ll go on a picnic.
Unless+simple present (affirmative)+future simple

Unless he studies hard, he won’t succeed.

When/Once+ simple present+future simple

Once she finishes her homework, she will go to bed.

 References: For further information check the following links:



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