Percentage Calculator
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What is X% of Y?
What is% of
X is what % of Y?
is what % of
Percentage change
Fromto
Grade percentage
Marks to percentage
out of
What do I need on the final?
How percentages work
X% of Y is Y × X ÷ 100. For example, 20% of 150 is 150 × 20 ÷ 100 = 30.
What percent is X of Y is X ÷ Y × 100. If you scored 42 out of 50, that is 42 ÷ 50 × 100 = 84%.
Percentage change is (new − old) ÷ old × 100. Going from 80 to 100 is a 25% increase, but going from 100 back to 80 is a 20% decrease, because the starting value is different.
Grade planner: your final exam must make up the gap between your target and what your existing coursework already contributes. Letter grades use the common US scale (A = 90 and above, B = 80 and above, and so on). Your school may use different cut-offs.