Real income can be calculated by applying the following formula :
Real Income =

Nominal‌Income

Price

‌Index‌of‌current‌year × Price Index of base year
Consider price index of base year as 100
When nominal income is given, we can convert it into real income with the help of GDP deflator.
Real Income =‌

‌ Nominal Income ‌

‌ GDP deflator ‌

×100