What you can calculate in this section
Choose a financial calculator by the decision you need to make, then review the formula, inputs, worked example and limitations. Start with the result you need, then confirm that every input comes from the same period and uses the definition shown on the selected page.
A calculator returns a mathematical result. The worked example and limitations explain whether that result belongs in the decision you are making.
46 guides and calculators
Each page below gives the direct definition first, then the equation or method, inputs, sample calculation, common mistakes and related formulas.
Compound Interest Formula
compound interest formula explained with the formula, inputs, example and limitations.
Open Compound Interest Formula →Investment Growth Calculator
investment growth calculator explained with the formula, inputs, example and limitations.
Open Investment Growth Calculator →Simple Interest Formula
simple interest formula explained with the formula, inputs, example and limitations.
Open Simple Interest Formula →Interest Calculator Savings
interest calculator savings explained with the formula, inputs, example and limitations.
Open Interest Calculator Savings →CAGR Formula
cagr formula explained with the formula, inputs, example and limitations.
Open CAGR Formula →Continuous Compound Interest Formula
continuous compound interest formula explained with the formula, inputs, example and limitations.
Open Continuous Compound Interest Formula →Gross Margin Formula
gross margin formula explained with the formula, inputs, example and limitations.
Open Gross Margin Formula →Net Income Formula
net income formula explained with the formula, inputs, example and limitations.
Open Net Income Formula →Debt-to-Equity Ratio
debt to equity ratio explained with the formula, inputs, example and limitations.
Open Debt-to-Equity Ratio →Return on Investment Formula
return on investment formula explained with the formula, inputs, example and limitations.
Open Return on Investment Formula →Retained Earnings Formula
retained earnings formula explained with the formula, inputs, example and limitations.
Open Retained Earnings Formula →Return On Equity Ratio Formula
return on equity ratio formula explained with the formula, inputs, example and limitations.
Open Return On Equity Ratio Formula →Calculator Present Value
calculator present value explained with the formula, inputs, example and limitations.
Open Calculator Present Value →Working Capital Formula
working capital formula explained with the formula, inputs, example and limitations.
Open Working Capital Formula →Gross Profit Formula
gross profit formula explained with the formula, inputs, example and limitations.
Open Gross Profit Formula →Current Ratio Formula
current ratio formula explained with the formula, inputs, example and limitations.
Open Current Ratio Formula →Future Value Formula
future value formula explained with the formula, inputs, example and limitations.
Open Future Value Formula →Contribution Margin Formula
contribution margin formula explained with the formula, inputs, example and limitations.
Open Contribution Margin Formula →EBITDA Formula
ebitda formula explained with the formula, inputs, example and limitations.
Open EBITDA Formula →Growth Rate Formula
growth rate formula explained with the formula, inputs, example and limitations.
Open Growth Rate Formula →Break-Even Formula
break even formula explained with the formula, inputs, example and limitations.
Open Break-Even Formula →Marginal Cost Formula
marginal cost formula explained with the formula, inputs, example and limitations.
Open Marginal Cost Formula →How to Calculate Interest Rate Per Month
how to calculate interest rate per month explained with the formula, inputs, example and limitations.
Open How to Calculate Interest Rate Per Month →Cap Rate Formula
cap rate formula explained with the formula, inputs, example and limitations.
Open Cap Rate Formula →Doubling Time Formula
doubling time formula explained with the formula, inputs, example and limitations.
Open Doubling Time Formula →Net Profit Margin Formula
net profit margin formula explained with the formula, inputs, example and limitations.
Open Net Profit Margin Formula →Price Equity Ratio Formula
price equity ratio formula explained with the formula, inputs, example and limitations.
Open Price Equity Ratio Formula →Annuity Formula
annuity formula explained with the formula, inputs, example and limitations.
Open Annuity Formula →Net Present Value Formula
net present value formula explained with the formula, inputs, example and limitations.
Open Net Present Value Formula →Operating Cash Flow Formula
operating cash flow formula explained with the formula, inputs, example and limitations.
Open Operating Cash Flow Formula →Double Declining Depreciation Formula
double declining depreciation formula explained with the formula, inputs, example and limitations.
Open Double Declining Depreciation Formula →Straight Line Depreciation Formula
straight line depreciation formula explained with the formula, inputs, example and limitations.
Open Straight Line Depreciation Formula →Simple Interest Loan Calculator
simple interest loan calculator explained with the formula, inputs, example and limitations.
Open Simple Interest Loan Calculator →How to Calculate Profit
how to calculate profit explained with the formula, inputs, example and limitations.
Open How to Calculate Profit →Operating Margin Formula
operating margin formula explained with the formula, inputs, example and limitations.
Open Operating Margin Formula →Cost of Equity Formula
cost of equity formula explained with the formula, inputs, example and limitations.
Open Cost of Equity Formula →Payback Period Formula
payback period formula explained with the formula, inputs, example and limitations.
Open Payback Period Formula →Revenue Formula
revenue formula explained with the formula, inputs, example and limitations.
Open Revenue Formula →Ebit Formula
ebit formula explained with the formula, inputs, example and limitations.
Open Ebit Formula →Present Value of Annuity Formula
present value of annuity formula explained with the formula, inputs, example and limitations.
Open Present Value of Annuity Formula →Customer Lifetime Value Formula
customer lifetime value formula explained with the formula, inputs, example and limitations.
Open Customer Lifetime Value Formula →Depreciation Formula
depreciation formula explained with the formula, inputs, example and limitations.
Open Depreciation Formula →Compound Interest Formula Excel
compound interest formula excel explained with the formula, inputs, example and limitations.
Open Compound Interest Formula Excel →Net Operating Income Formula
net operating income formula explained with the formula, inputs, example and limitations.
Open Net Operating Income Formula →Income Statement Formula
income statement formula explained with the formula, inputs, example and limitations.
Open Income Statement Formula →Equity Value Formula
equity value formula explained with the formula, inputs, example and limitations.
Open Equity Value Formula →How to choose the right formula
- Name the decision.
Decide whether you need a value, rate, margin, return, balance or comparison. - Match the timing.
Use annual figures with annual figures and distinguish a point-in-time balance from a period flow. - Check the definition.
Confirm what each numerator, denominator, cash flow or cost includes. - Run an example.
Reproduce the sample result before entering your own figures. - Test another case.
Change one assumption at a time and record what drives the answer.
Frequently asked questions
What is financial calculators?
Choose a financial calculator by the decision you need to make, then review the formula, inputs, worked example and limitations.
How should I use financial calculators?
Use the formula only after matching every input to the same period, unit and definition. Then compare the result with a worked example and the decision you are trying to make.
What is the most common mistake with financial calculators?
The most common mistake is choosing a familiar formula before defining the decision, period, units and available inputs.
Can I calculate financial calculators in a spreadsheet?
Yes. Reproduce the displayed equation with separate cells for each input, keep percentages as decimals, and test the spreadsheet against the worked example before replacing the sample figures.
Sources and methodology
The section’s financial context is checked against Beginners’ Guide to Financial Statements. Each leaf page names the source used for its specific formula or reporting relationship.