Is the rate before or after tax?

This is a gross rate. Apply your marginal tax rate for after-tax results in taxable accounts.

How often does this compound?

Monthly. For other frequencies, the result is approximate.

This is a gross rate. Apply your marginal tax rate for after-tax results in taxable accounts.

Monthly. For other frequencies, the result is approximate.

Investment

Calculate interest earned on a deposit over time with optional contributions.

Initial Deposit

Monthly Contribution

Annual Interest Rate

Years

$$FV \;=\; P(1+r)^{n} + C\cdot\frac{(1+r)^{n}-1}{r}$$

Where

FVfuture value

Pprincipal

Cperiodic deposit

rperiodic rate

nperiods