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What’s the difference between “if” and “in case”
It is important not to confuse “if” and “in case”. They can be used in similar sentences, but they have different meanings. Consider the following examples:
 I will take a coat if it rains.
 I will take a coat in case it rains.
Here, “if” is used to present a conditional situation (dependent it raining), while “in case” is a precaution (done to prepare for the rain).
“In case” is usually used to show that an action is being taken, or preparations have been made, as a precaution – so the action or event is completed based on a possibility.
 I have bought extra porridge in case we need more.
 He was expecting a delivery, so he stayed at home in case it arrived.
“If”, as a conditional, shows an action or event that is dependent on something else happening. The action will not happen unless the if clause happens.
 I will go to the play if I have some spare time.
 She will receive a reward if she passes her exam.
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Using “if” and “in case”
For sentences where it seems that both can apply, “if” and “in case” can therefore refer to completing actions at different times – “in case” actions are done in advance, while “if” actions only occur on a condition. Consider these examples:
 Call me if you need any help.
 Call me in case you need any help.
The first sentence tells you to call only when you need help, the second sentence tells you to call before you need help (and in this case may be to check whether or not you need help).
 We’ll proofread the report in case there are mistakes.
 We’ll proofread the report if there are mistakes.
The first sentence here says it will be done anyway, to find mistakes, but the “if” sentence tells us there will be no proofreading unless a mistake is found first.
Sometimes the difference can be subtle, such as when a precaution is already in place but will only be relevant if a condition occurs.
 She can give you advice, in case you need help.
 She can give you advice, if you need help.
The first sentence emphasizes that she is prepared to give advice, as a precaution, while the second sentence shows she will give advice if it is needed. The two sentences are very similar, but have grammatically different meanings.