How to Calculate Perimeter (Every Shape)
How to calculate perimeter: add up all the sides. Formulas for rectangles, squares, triangles, and circles, with examples and perimeter vs area.
Math & Education
Math & Education
How to Calculate a Ratio (and Simplify It)
How to calculate a ratio: write it with a colon and simplify by dividing by the greatest common factor. Learn to scale ratios and convert to percentages.
Math & Education
How to Calculate the Average (Mean, Median, Mode)
How to calculate the average: the mean, median, and mode explained with one worked example, plus when to use each type of average.
Math & Education
How to Convert a Fraction to a Percentage
How to convert a fraction to a percentage: divide the top by the bottom and multiply by 100. Includes examples, a conversion chart, and the reverse.
Math & Education
Percentage Change vs Percentage Difference
Percentage change vs percentage difference: change divides by the original value, difference by the average. See both formulas worked on the same numbers.
Money & Finance
How Much Down Payment Do You Need?
How much down payment do you need? Typically 10% to 20% of the home price, with 20% avoiding mortgage insurance. Includes a worked example.
Money & Finance
How Much to Save Each Month to Hit a Goal
How much to save each month? Divide your goal by the number of months. Includes a worked example, how growth helps, and the 50/30/20 rule.
Money & Finance
How Big Should Your Emergency Fund Be?
How big should your emergency fund be? Aim for 3 to 6 months of essential expenses. Learn how to calculate your target and when to save more.
Money & Finance
APR vs Interest Rate: What Is the Difference?
APR vs interest rate explained: the interest rate is the borrowing cost, the APR adds fees for the true yearly cost. Learn which to compare and why.
Money & Finance
How to Calculate Your Net Worth
How to calculate net worth: add up your assets, subtract your liabilities. Includes a worked example, what to include, and why tracking the trend matters.