How to Calculate Amortization (Schedules & Formulas)
Understand how loan amortization works, read an amortization schedule, see why interest is front-loaded, and learn extra payment strategies to save thousands.
How to Calculate Area (Every Common Shape)
Learn area formulas for rectangles, triangles, circles, trapezoids, and composite shapes. Includes unit conversions, worked examples, and practical applications.
How to Calculate Averages (Mean, Median, Mode & More)
Learn how to calculate mean, median, mode, weighted average, and trimmed mean with step-by-step formulas, worked examples, and guidance on when to use each type.
How to Calculate BMI (Body Mass Index)
Learn the BMI formula, understand WHO weight categories, and discover when BMI is useful vs misleading. Includes worked examples for metric and imperial units.
How to Calculate BMR (Basal Metabolic Rate)
Compare the Mifflin-St Jeor and Harris-Benedict BMR formulas with worked examples. Learn what affects your resting metabolism and how BMR connects to TDEE.
How to Calculate Body Fat Percentage (Navy Method)
Learn the U.S. Navy body fat formula with step-by-step examples, body fat category charts, measurement tips, and comparisons to DEXA, calipers, and other methods.
How to Calculate Daily Calories for Your Goals
Learn the Mifflin-St Jeor equation, activity multipliers, and how to set calorie targets for weight loss, maintenance, or muscle gain. Includes worked examples.
How to Calculate Days Between Two Dates
Step-by-step guide to calculating the exact number of days between any two dates. Covers leap years, business days, month lengths, and worked examples.
How to Calculate Discounts and Sale Prices
Learn the discount formula, how stacking coupons actually works (20%+10% isn't 30%), and how to compare deals after tax. Includes real Black Friday examples.
How to Calculate Your Exact Age in Days
Learn how to calculate your exact age in days, hours, and seconds. Covers leap year math, fun age milestones, zodiac date ranges, and legal age thresholds.
How to Calculate Your GPA (4.0 Scale Guide)
Learn the exact formula to calculate your semester and cumulative GPA on a 4.0 scale. Includes a worked example with 5 courses and tips to raise a low GPA.
How to Calculate Ideal Weight (4 Formulas Compared)
Compare the Devine, Robinson, Miller, and Hamwi ideal weight formulas with worked examples. Learn why ideal weight varies and what these numbers actually mean.
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