Finance Calculator
Calculate loan payments, interest, compound growth, ROI and savings in one place.
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Included Calculators
- Loan Calculator — monthly payment and total interest for amortized loans
- Simple Interest — I = P × r × t
- Compound Interest — FV = P(1 + r/n)^(nt)
- ROI Calculator — return on investment percentage
- Savings Calculator — growth with monthly deposits
- Payment Calculator — amortized payment for any financed amount
Formulas
Monthly Payment = P × r(1+r)^n ÷ ((1+r)^n − 1) where r is the monthly rate and n the number of payments.
Compound Interest: FV = P(1 + r/n)^(nt) where n is compounding frequency per year and t the time in years.
Frequently Asked Questions
Using the amortization formula: Payment = P × r(1+r)^n ÷ ((1+r)^n − 1), where P is principal, r the monthly interest rate, and n the number of monthly payments.
Simple interest is earned only on the principal (I = P×r×t). Compound interest is also earned on previously accumulated interest, so it grows faster over time.
ROI = (Return − Cost) ÷ Cost × 100%. Investing $1000 and getting back $1300 is a 30% ROI.
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Free to use — copy this code onto your site. It stays up to date automatically and includes a link back to CalcSun.