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Simple & compound interest formulas
10 formulas for Simple & compound interest, from the Arithmetic & Quantitative Aptitude section of the Quantix formula library. Tap 🧮 next to a formula to solve it for any variable with step-by-step working.
| Name | Formula | Note |
|---|---|---|
| Simple interest | SI = P × R × T / 100 🧮 Solve step by step | P principal, R rate % p.a., T years |
| Amount (SI) | A = P + SI = P(1 + RT/100) 🧮 Solve step by step | |
| Compound interest — amount | A = P(1 + R/100)ⁿ 🧮 Solve step by step | compounded yearly |
| Compound interest | CI = P[(1 + R/100)ⁿ − 1] | |
| Half-yearly compounding | A = P(1 + R/200)²ⁿ 🧮 Solve step by step | |
| Quarterly compounding | A = P(1 + R/400)⁴ⁿ 🧮 Solve step by step | |
| CI − SI for 2 years | P(R/100)² | |
| CI − SI for 3 years | P(R/100)²(3 + R/100) | |
| Continuous compounding | A = P·e^(rt) 🧮 Solve step by step | r as a decimal |
| Rule of 72 | Years to double ≈ 72 / R |
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