Use this compound interest calculator to calculate investment growth using simple or compound interest formulas. Supports savings, loans, and long-term financial projections.
The kovertiz interest growth calculator is designed for precise financial forecasting. Use it to evaluate savings accounts, investment returns, loan interest, and long-term capital growth with mathematically accurate results.
Trusted by investors, students, and financial professionals. All calculations run locally in your browser — no data storage, no tracking, complete privacy.
Reference formulas used by this interest calculator.
Total = P × (1 + r × t)
P = principal amount · r = annual interest rate · t = time in years
Total = P × (1 + r)t
Interest is applied once per year using standard annual compounding.
Practical examples showing how interest type affects total balance over time. Values are calculated using standard annual interest formulas.
| Initial Amount | Annual Rate | Time (Years) | Interest Type | Total Balance | Interest Earned |
|---|---|---|---|---|---|
| $1,000 | 5% | 5 | Simple | $1,250 | $250 |
| $1,000 | 5% | 5 | Compound | $1,276.28 | $276.28 |
| $2,500 | 7% | 10 | Simple | $4,250 | $1,750 |
| $2,500 | 7% | 10 | Compound | $4,918.49 | $2,418.49 |
Common questions about calculating simple and compound interest.
Simple interest is calculated only on the initial principal. Compound interest is calculated on the principal plus previously accumulated interest, resulting in exponential growth over time.
Compound interest is calculated by applying the interest rate to the total balance for each period. This calculator uses standard annual compounding to compute the final balance and total interest earned.
Yes. You can switch between simple and compound interest modes. Simple interest applies a linear calculation based only on the original principal.
The calculator requires an initial amount, an annual interest rate, a time period in years, and the interest type. Results update instantly based on these values.
Yes. All calculations are based on standard financial formulas and are performed locally in your browser using JavaScript.
No. All calculations run entirely on the client side. No financial data is transmitted, stored, or logged by kovertiz.