Finance calculators
32 calculators
Finance tools project future value, inflation effects, and ratio-style metrics using the closed-form expressions on each page. Figures omit taxes, fees, and product-specific rules unless a page says otherwise.
Use these for illustration and homework-style checks, not as investment advice. Open a calculator for the exact rate convention and compounding assumption it applies. Finance tools are free — no account required.
Interest and growth calculators
Compounding, APY, CAGR, inflation, and rule-of-72 style growth.
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APY Calculator
Convert nominal APR and compounding frequency into annual percentage yield.
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Certificate of Deposit Calculator
Estimate CD maturity value with compound interest (workbook: Certificate of Deposit).
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Compound Annual Growth Rate (CAGR) Calculator
Average annual growth rate between a start and end value.
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Compound Interest Rate Calculator
Solve for the nominal rate that grows principal to a future value.
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Effective Interest Rate Calculator
Effective annual rate from a nominal rate and compounding frequency.
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Equivalent Annual Rate (EAR) Calculator
Equivalent annual rate (EAR) from nominal rate and compounding.
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Forward Rate Calculator
Implied forward rate between two spot-rate maturities.
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Inflation Calculator
See future nominal value and today's purchasing power after inflation.
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Rule of 72 Calculator
Years to double at a constant annual rate.
Loans and debt calculators
Payoff, refinance, and loan comparison.
Investments calculators
Future value, DCA, dividends, and savings goals.
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DCA Investment Calculator
Future value of regular fixed deposits (DCA).
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Dividend Calculator
Compute annual dividend income and yield from shares owned.
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Dividend Discount Model Calculator
Value a stock from next year's dividend, required return, and growth (Gordon model).
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Expense Ratio Calculator
Fund expense ratio as annual expenses over average assets.
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Expense Ratio Calculator (Cost of ETF)
Estimate the dollar cost of an ETF expense ratio over time.
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Future Value Calculator
Project how a present amount grows at a periodic rate.
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Investment Calculator
Project future value of a principal with regular deposits and compound growth.
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Savings Goal Calculator
Monthly deposit needed to reach a goal.
Ratios calculators
Liquidity, profitability, and related financial ratios.
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Cash Flow to Debt Ratio Calculator
Measure operating cash flow relative to total debt.
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Cash Ratio Calculator
Compare cash and cash equivalents to current liabilities.
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Current Ratio Calculator
Assess short-term liquidity: current assets ÷ current liabilities.
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Dividend Payout Ratio Calculator
See what share of net income is paid out as dividends.
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EBITDA Calculator
Estimate earnings before interest, taxes, depreciation, and amortization.
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Earnings per Share (EPS) Calculator
Compute basic EPS (workbook name: Earnings per Share (EPS)).
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Net Profit Margin Calculator
Net profit margin from net income and revenue.
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Return on Ad Spend (ROAS) Calculator
Measure revenue generated per dollar of ad spend (workbook: Return on Ad Spend (ROAS)).
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Return on Investment (ROI) Calculator
Calculate ROI as percent gain relative to cost (workbook: Return on Investment (ROI)).
Income and tax calculators
Salary conversions and sales tax.