Financial calculators

Simple interest calculator

Interest calculated only on your original principal, never on interest already earned — the straight-line counterpart to compound interest.

Compound interest calculator

See how a lump sum and monthly contributions grow over time — with a year-by-year breakdown of contributions vs. interest earned.

Savings goal calculator

Set a target amount and a deadline — we calculate the monthly contribution you need to get there.

FIRE calculator

Financial Independence, Retire Early: find your FIRE number and how long it could take to get there at your current savings rate.

Present value calculator

Work out today's equivalent of a future amount of money — useful for goals like a lump-sum college fund or a future purchase.

Loan calculator

Enter your loan amount, rate and term to see your monthly payment and exactly how much goes to interest vs. principal each year.

Mortgage calculator

Enter the home price, down payment, rate and term — we calculate your loan amount, monthly payment and total interest over the life of the mortgage.

Extra payment calculator

Add a fixed extra amount to your monthly payment and see exactly how much sooner you pay off the loan — and how much interest you save.

Credit card payoff calculator

Compare paying only the minimum against a fixed monthly payment — minimum payments can take decades and cost far more in interest than most people expect.

Debt payoff calculator

Enter your debts once and see exactly when you'll be debt-free, how much interest you'll pay, and which one to attack first — with the snowball (smallest balance first) or avalanche (highest rate first) method.

Emergency fund calculator

Find out how far your current savings would carry you, and how many months it takes to reach a full emergency fund at your own pace.

ROI calculator

See how much an investment actually returned — as a simple percentage, and annualized if it ran for more than a year, so you can compare it fairly against other opportunities.

CAGR calculator

Find the smooth, constant annual growth rate that would take a beginning value to an ending value over a number of years — the standard way to compare investments or business growth across different time periods.

Dividend growth & DRIP calculator

Project how a dividend-paying investment grows over time — dividend income, share count, and portfolio value — with dividend reinvestment (DRIP) on or off.

DCA (Dollar-Cost Averaging) calculator

Investing a fixed amount every month, regardless of the price, is one of the simplest ways to build a position over time. See what a one-time amount plus regular monthly contributions could grow into at an expected annual return.

Break-even point calculator

Find out exactly how many units you need to sell — and how much revenue that represents — before your business starts making a profit.

EBITDA calculator

See a company's operating profitability before the effect of financing, tax structure, and non-cash accounting charges — the number investors and lenders use to compare businesses on a level footing.

Unit economics calculator (CAC & LTV)

The single number that decides if a growth strategy actually works: how much a customer is worth over their lifetime, versus how much it costs to acquire one.

Refinance calculator

See whether refinancing your loan or mortgage is actually worth it — including the closing costs and what a longer term really costs you over time.

Markup vs. margin calculator

Markup and margin measure the same profit from two different angles — mixing them up is a common pricing mistake. See both, calculated from your own cost and price.

Working capital calculator

See whether your business can cover its short-term obligations, measured three complementary ways: in dollars, and as two liquidity ratios.