Project simple or compound growth with adjustable compounding frequency. Fully client-side — no account, uploads, or remote storage.
Added Apr 18, 2026 · Updated May 1, 2026
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Enter a value for interest type to see your result.
Calculates simple and compound interest. Simple interest grows linearly on the principal. Compound interest earns interest on accumulated interest, growing exponentially.
Simple: Amount = P × (1 + r × t) Compound: Amount = P × (1 + r/n)^(n × t) Interest = Amount − P
10,000 × (1 + 0.08 × 5) = 14,000. Interest = $4,000.
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10,000 × (1 + 0.08/12)^60 ≈ 14,898.46.
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Simple interest is calculated only on the original principal. Compound interest is calculated on the principal plus accumulated interest, so your money grows faster.
More frequent compounding means slightly higher returns. Monthly compounding gives more than annual, and daily compounding gives the maximum for a given nominal rate.
You enter a nominal annual rate and choose how often interest compounds. APY (annual percentage yield) bundles compounding into one comparable figure; APR often refers to loan costs including fees. For investments, compare like-for-like compounding assumptions.
No. The math shows nominal growth of principal at the stated rate. Real purchasing power can be lower after inflation, capital gains tax, or management fees.
You can approximate savings growth, but loans with scheduled payments need an amortization model. Use the EMI or mortgage calculators for payment schedules and total interest on debt.