The math behind
the answer.
Understand the relationship first, then open the calculator when you want to test your own numbers.
Percentage Formula
Percentage amount = (percentage ÷ 100) × base valueLearn the percentage formula, how to find X% of a number, how to reverse a percentage, and how the variables relate.
Understand the formula ↗Percentage Change Formula
Percentage change = ((new value − original value) ÷ |original value|) × 100Understand the percentage increase and decrease formula from an original value to a new value.
Understand the formula ↗Profit Margin Formula
Profit margin % = ((revenue − cost) ÷ revenue) × 100Learn the profit margin formula, the difference between profit and margin, and how revenue and cost affect the result.
Understand the formula ↗Markup Formula
Markup % = ((selling price − cost) ÷ cost) × 100Learn the markup formula and why markup percentage is different from profit margin.
Understand the formula ↗Break-Even Formula
Break-even units = fixed costs ÷ (price per unit − variable cost per unit)Learn the break-even units formula using fixed costs, selling price and variable cost per unit.
Understand the formula ↗ROI Formula
ROI % = ((final value − investment) ÷ investment) × 100Learn the return on investment formula and how gain or loss is measured relative to the amount invested.
Understand the formula ↗ROAS Formula
ROAS = revenue attributed to ads ÷ ad spendLearn the return on ad spend formula and how attributed revenue relates to advertising spend.
Understand the formula ↗CAGR Formula
CAGR = (ending value ÷ beginning value)^(1 ÷ years) − 1Learn the compound annual growth rate formula for converting beginning value, ending value and time into an annualized growth rate.
Understand the formula ↗Compound Interest Formula
A = P(1 + r ÷ n)^(n × t)Learn the compound interest formula using principal, annual rate, compounding frequency and time.
Understand the formula ↗Simple Interest Formula
Interest = principal × annual rate × yearsLearn the simple interest formula for principal, annual rate and time.
Understand the formula ↗Mortgage Payment Formula
Payment = P × r(1+r)^n ÷ ((1+r)^n − 1)Understand the fixed-rate mortgage principal-and-interest payment formula and the variables behind the monthly payment.
Understand the formula ↗Loan Payment Formula
Payment = P × r(1+r)^n ÷ ((1+r)^n − 1)Learn the fixed-payment loan formula used for amortizing installment loans.
Understand the formula ↗Hourly to Salary Formula
Annual gross pay = hourly rate × hours per week × working weeks per yearLearn how hourly rate, hours per week and working weeks per year combine into estimated annual gross pay.
Understand the formula ↗Discount Formula
Sale price = original price × (1 − discount ÷ 100)Learn how to calculate discount amount, sale price and percent off from an original price.
Understand the formula ↗Average Formula
Average = sum of values ÷ number of valuesLearn the arithmetic mean formula and how sum and count determine the average of a set of numbers.
Understand the formula ↗