Step-by-step formula guides with worked examples, common mistakes, and free calculators for every topic.
How to Calculate Compound Interest
A = P(1 + r/n)^(nt)
How to Calculate Percentage
Percentage = (Part / Whole) × 100
How to Calculate BMI
BMI = weight (kg) / height² (m²) [Metric]
How to Calculate Mortgage Payment
M = P × [r(1+r)^n] / [(1+r)^n − 1]
How to Calculate GPA
GPA = Σ(Grade Points × Credit Hours) / Σ(Credit Hours)
How to Calculate CAGR
CAGR = (End Value / Start Value)^(1/n) − 1
How to Calculate Debt-to-Income Ratio
DTI = (Total Monthly Debt Payments / Gross Monthly Income) × 100
How to Calculate Break-Even Point
Break-Even Units = Fixed Costs / (Price per Unit − Variable Cost per Unit)
How to Calculate ROI
ROI = [(Net Return / Cost of Investment)] × 100
How to Calculate Net Present Value (NPV)
NPV = Σ [Ct / (1 + r)^t] − C₀
How to Calculate EBITDA
EBITDA = Net Income + Interest + Taxes + Depreciation + Amortization
How to Calculate Standard Deviation
σ = √[Σ(xi − μ)² / N] [Population]
How to Calculate Profit Margin
Gross Margin = (Revenue − COGS) / Revenue × 100
How to Calculate Working Capital
Working Capital = Current Assets − Current Liabilities
How to Calculate WACC
WACC = (E/V × Re) + (D/V × Rd × (1 − Tc))
How to Calculate Customer Acquisition Cost (CAC)
CAC = Total Sales & Marketing Costs / Number of New Customers Acquired
How to Calculate Employee Turnover Rate
Turnover Rate = (Number of Separations / Average Number of Employees) × 100
How to Calculate Payback Period
Payback Period = Initial Investment / Annual Cash Inflow [Even cash flows]
How to Calculate Depreciation
Straight-Line: Annual Depreciation = (Cost − Salvage Value) / Useful Life
How to Calculate Calorie Deficit
Calorie Deficit = TDEE − Daily Calorie Intake
