Guides for everyday decisions
Straightforward explanations to help you use our calculators and make sense of the numbers behind them.
Health
How to calculate BMI—and what it means
The formula, adult ranges, and why BMI is only one part of a health picture.
Health
How daily calorie needs are estimated
Understand BMR, activity factors, and the limits of a calorie estimate.
Money
The 50/30/20 budget rule
A flexible way to organize needs, wants, saving, and debt payoff.
Money
How compound interest works
See why time and regular contributions are so important to saving.
Borrowing
How to compare loan offers
A checklist for APR, fees, repayment terms, and total borrowing cost.
Home buying
Understanding mortgage costs
Look beyond principal and interest before you decide what fits your budget.