Interest calculated on both the initial principal and the accumulated interest from previous periods — 'interest on interest'.
Compound interest accelerates wealth growth (for savings) or debt accumulation (for loans) because each period's interest is added to the principal, creating a larger base for the next calculation. The frequency of compounding (daily, monthly, quarterly, annually) significantly affects the final amount. Albert Einstein reportedly called it 'the eighth wonder of the world.' Understanding compound interest is essential for investment planning, loan evaluation, and financial literacy.
₹1,00,000 invested at 8% annual interest compounded monthly for 5 years: A = 1,00,000 × (1 + 0.08/12)^(12×5) = ₹1,48,984. Simple interest would yield only ₹1,40,000 — compound interest earns ₹8,984 more.
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Simple interest is calculated only on the original principal. Compound interest is calculated on principal plus accumulated interest. Over time, compound interest grows exponentially while simple interest grows linearly.
More frequent compounding yields higher returns. ₹1,00,000 at 12% for 1 year: Annual compounding = ₹1,12,000. Monthly compounding = ₹1,12,683. Daily compounding = ₹1,12,747. The difference grows significantly over longer periods.
A financial metric that measures the profitability of an investment by comparing the net profit to the cost of the investment, expressed as a percentage.
The gradual write-off of the cost of an intangible asset (like patents, software, or goodwill) over its useful life, or the repayment of a loan in installments.
An electronic fund transfer system in India that enables bank-to-bank transfers in batches, available 24/7 with near-instant settlement.
The point at which a business's total revenue equals total costs, resulting in neither profit nor loss.
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