What is compound interest?

Interest calculated on the initial principal and on accumulated interest from previous periods (interest on interest).

How does compounding frequency affect returns?

More frequent compounding (e.g., monthly or daily) yields slightly higher returns than annual compounding at the same nominal rate.

Does this include taxes or fees?

No. It provides an estimate only and does not account for taxes, fees, or market volatility.

Can I include inflation?

Yes. Enable inflation to see an inflation-adjusted (real) future value using the Fisher equation.

Do you store my data?

No. Calculations run entirely in your browser. Use Export or Share Link to save your setup.

Compound Interest Calculator

Name: Compound Interest Calculator
Author: CalculatorBolt

Calculate compound interest and future value of your savings or investment. Enter principal, contributions, rate, compounding frequency, and term. See total interest earned. Informational only—consult a financial advisor. Explore more tools on free calculators on CalculatorBolt.

Calculator

Initial Principal

Monthly Contribution

Annual Interest Rate (%)

Compounding Frequency

Investment Term (years)

Find Principal for Goal (Target FV)

Future Value

Total Contributions

Total Interest

Real Future Value

Import JSON

Contribution Frequency

Start Date

End Date

Auto-calculated from term

Include Inflation

Inflation Rate (%)

FV Rounding

Interest Rounding

How it works

Future Value = Principal × (1 + r/n)^(n·t) + Contribution × (( (1 + r/n)^(n·t) − 1 ) / (r/n)) × (m/n). We calculate based on initial principal, regular contributions, annual rate, compounding frequency, and term. If inflation is included, we use the real rate via (1+r)/(1+i)−1.

Inputs explained

Initial Principal, Monthly Contribution, Annual Interest Rate, Compounding Frequency, Investment Term, Advanced Options (contribution frequency, inflation, rounding).