Everyday Calculators and Practical Guides

Simple calculators and practical guides for everyday decisions.

Explore Calculators

Calculate tip amount, total bill, and cost per person. Quick tip percentages at 15%, 18%, 20%, or custom.

Split a restaurant bill evenly including tip and tax. See exactly how much each person should pay.

Convert your hourly wage to annual, monthly, and weekly salary. See what $15, $20, $25+ per hour equals per year.

Calculate body mass index from height and weight, plus BMI category and a healthy weight range estimate.

Estimate daily calories for maintenance, weight loss, or weight gain based on age, sex, height, weight, and activity level.

Estimate daily water intake from weight, exercise time, and hot or humid climate needs.

Step-by-step guide to convert annual salary to hourly rate. Learn the formula, see examples, and use our free calculator.

Learn the fair way to split a restaurant bill evenly. Covers tax, tip percentages, and common mistakes to avoid.

Simple method to measure and calculate the square footage of any room. Includes tips for irregular shapes.