Simple explanations to help you understand the formulas behind Fast Calculator tools.
Learn the basic percentage formula and how to find what percent one number is of another.
Percentage calculations are based on: part ÷ whole × 100. Example: 25 ÷ 200 × 100 = 12.5%. Use the Percentage Calculator for quick results.
Understand the BMI formula using height and weight.
BMI is calculated from weight in kilograms divided by height in meters squared. Enter your measurements in the BMI Calculator to get the result.
Understand monthly payments, interest and total repayment.
EMI depends on loan principal, monthly interest rate and number of monthly payments. The EMI Calculator provides the estimated monthly payment and total interest.
Understand the difference between simple and compound growth.
Simple interest is calculated directly on principal, while compound interest adds interest to the balance over time. Compare both with the Simple Interest Calculator and Compound Interest Calculator.
Calculate sale savings and final prices.
Multiply the original price by the discount percentage to find the savings, then subtract savings from the original price. Try the Discount Calculator.
Learn profit, margin and markup.
Profit is selling price minus cost. Profit margin is profit divided by selling price, expressed as a percentage. Check your figures with the Profit Margin Calculator.