Everyday math
Online calculators
Straightforward calculations with clear inputs, useful results, and the formula when it helps.
Calculate with confidence
Launch collection
11 focused calculators for everyday math, percentages, shopping, and shared bills.
Percentage Calculator
Calculate percentages, proportions, and percentage change.
Open toolTip Calculator
Calculate a tip, split the bill, and optionally round up.
Open toolDiscount Calculator
Find savings and final price for percentage or fixed discounts.
Open toolAverage Calculator
Find mean, median, sum, count, minimum, maximum, and range.
Open toolDate Difference Calculator
Calculate elapsed days, complete weeks, and inclusive days between dates.
Open toolAge Calculator
Find exact age in completed years, months, and days on any date.
Open toolSales Tax Calculator
Calculate sales tax, subtotal, final total, and per-item cost.
Open toolUnit Price Calculator
Compare two package prices and find the lower cost per unit.
Open toolFuel Cost Calculator
Estimate trip fuel use, total cost, and cost per distance.
Open toolLoan Payment Calculator
Estimate monthly principal-and-interest payments and loan totals.
Open toolCompound Interest Calculator
Project compound growth, regular contributions, and interest earned.
Open toolBuilt for clarity
Get the number and understand it
These calculators are built for everyday decisions, estimates, and double-checks. Inputs stay in your browser, and every result is available without an account.
Each tool includes a worked example, a plain-language formula, and guidance for the edge cases most likely to cause confusion.