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Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. The compounding frequency (daily, monthly, quarterly, annually) significantly affects the final amount — more frequent compounding means faster growth. The formula is A = P × (1 + r/n)^(n×t), where P is principal, r is annual rate, n is periods per year, and t is years.
Review the inputs carefully and treat the output as an estimate. For decisions involving money, taxes, health, law, or security, compare the result with trusted professional guidance when needed.
What is the difference between compound and simple interest?
Simple interest is calculated only on the principal. Compound interest is calculated on principal plus accumulated interest, resulting in exponential growth over time. The difference becomes significant over long periods.
How much does compounding frequency matter?
Daily compounding earns slightly more than monthly, which earns slightly more than annual. For a 5% rate, the difference between annual and daily compounding is about 0.12% in effective annual yield — meaningful over decades but small short-term.
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Calculate compound interest growth with flexible compounding frequencies from annual to daily.
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Project how much your savings will grow with regular deposits and compound interest.
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Calculate simple interest earned on a principal at a fixed annual rate over a set time period.
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