Calculation of Percentage | Calculation of Interest | Compound Computation of Interest | Formulas | Bank formulas

German: Prozentrechnung und Zinsberechnung

Formulas

Calculation of Percentage

a of b equals c%.

a = (b * c) / 100
b = (100 * a) / c
c = (100 * a) / b

Calculation of Interest

a with an interest rate of b% is c after 1 year

a = c / (b / 100 + 1)
b = 100 * (c - a) / a
c = a * b / 100 + a

Compound Computation of Interest

a with an interest rate of b% is after c years d.

a = d / (1 + (b / 100))c
b = 100 * (c√(d / a) - 1)
c = (ln(d / a)) / (ln(1 + (b / 100)))
d = a * (1 + (b / 100))c

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