Calculators Hub
Percentage
Ratio & Proportion
Probability
Simple Interest
Compound Interest
Type
What is X% of Y?
X is what % of Y?
Percentage change (from A to B)
Add X% to Y
Subtract X% from Y
Value A / Base / From
% or Value B
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Type
Simplify Ratio A:B
Solve proportion A/B = C/D → find D
A
B
C (for proportion)
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For proportion: A/B = C/D → finds D
Favorable outcomes
Total possible outcomes
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Probability = favorable / total
Principal (P)
Annual Rate % (r)
Time (years) (t)
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Principal (P)
Annual Rate % (r)
Time (years) (t)
Compounds per year (n)
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A = P(1 + r/n)^(nt)