THE TOOLBOX
A calculator for the task at hand. Clear results, useful explanations, and no sign-up in the way.
Free scientific calculator for expressions, powers, roots and trigonometry. Choose degrees or radians, check worked examples and review calculation rules.
Free percentage calculator to find a percent of a number, a part as a percentage, an original total or percentage change. Check formulas and worked examples.
Free fraction calculator to add, subtract, multiply and divide fractions or mixed numbers. Get a reduced exact answer, decimal result and worked examples.
Free ratio calculator to simplify ratios or solve a missing proportion. Use fractions or decimals, check units and follow examples for scaling and shares.
Free average calculator for mean, median, sum, count, minimum and maximum. Enter a number list and learn when equal-weight averages can give a useful result.
Free grade calculator for weighted percentage scores. Check contributions and weights totaling 100%, compare exam scenarios and avoid common grading errors.
Free age calculator to find completed years, months and days on a chosen date. Check birthday, leap-day and month-end examples with clear calendar rules.
Free date calculator to count days between dates or add years, months and days. Choose inclusive counting and check leap-year and month-end examples.
Free time duration calculator for hours, minutes and seconds between clock times. Choose an overnight interval and convert the result to decimal hours.
Free discount calculator for sale prices, stacked percentage discounts and optional sales tax. Compare savings, final prices and practical worked examples.
Free paycheck calculator for US 2026 federal withholding and employee FICA. Estimate pay per check, see the tax breakdown, and check year-to-date limits.
Free BMI calculator for adults age 20 and older. Use kg/cm or lb/in, see the adult screening category, and understand the limits of body mass index.
Free calorie calculator for adult maintenance energy. Estimate resting calories and activity-adjusted kcal per day with clear formulas and limitations.
Free mortgage calculator for a fixed-rate loan. Estimate monthly principal and interest, add your property tax and insurance, and review total interest.
Free compound interest calculator with monthly deposits. Compare a fixed-rate growth scenario, total contributions and interest, with explicit assumptions.
