Days Between Dates Calculator
Count the days between two dates with clear inclusion options.
Open calculatorUseful math for everyday problems
Useful calculators for everyday problems
Calculate dates, percentages, money, measurements, and other everyday math quickly and clearly.
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Add or Subtract a Date
Move forward or backward by days, weeks, months, or years.
Open calculatorBusiness Days Between Dates
Count working days while excluding weekends, holidays, and custom dates.
Open calculatorDeadline Calculator
Find a date before or after a starting date using calendar or business-day rules.
Open calculatorPercentage Calculator
Solve three common percentage questions with a clear calculation.
Open calculatorPercentage Change Calculator
Find the percentage increase or decrease from one value to another.
Open calculatorPercentage Difference Calculator
Compare two values symmetrically when neither is a starting value.
Open calculatorDiscount Calculator
Find the sale price, savings, and optional tax after a percentage discount.
Open calculatorTip Calculator
Split a bill and tip across any number of people.
Open calculatorAverage Calculator
Find the mean, median, range, count, and sum of a list of numbers.
Open calculatorFraction, Decimal & Percent Converter
Convert a fraction, decimal, or percentage into the other two forms.
Open calculatorRatio & Proportion Calculator
Simplify a ratio or solve for one missing value in a proportion.
Open calculatorLoan Payment Calculator
Estimate payments for a fixed-rate, fully amortizing loan.
Open calculatorCompound Interest Calculator
Estimate growth from compound interest and regular contributions.
Open calculatorTake-Home Pay Estimator
Estimate your 2026 take-home pay after federal income tax withholding, Social Security, Medicare, and deductions you enter.
Open calculatorHousehold Budget Calculator
Add your household income and expenses to see your monthly budget, annual totals, spending by category, and how much you have left.
Open calculatorLength Converter
Convert between metric and imperial length units.
Open calculatorWeight & Mass Converter
Convert between common metric and imperial mass units.
Open calculatorTemperature Converter
Convert temperatures between Celsius, Fahrenheit, and Kelvin.
Open calculatorPaint Calculator
Estimate the wall paint needed for a rectangular room.
Open calculatorArea Converter
Convert square measurements, acres, hectares, and square miles.
Open calculatorVolume Converter
Convert metric, cubic, and clearly labeled US customary volume units.
Open calculatorSpeed Converter
Convert miles per hour, kilometers per hour, meters per second, feet per second, and knots.
Open calculatorSales Tax Calculator
Add sales tax to a price or remove tax from a tax-inclusive total.
Open calculatorMarkup & Margin Calculator
Calculate selling price, profit, markup, and margin without confusing their different bases.
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Calculator categories
Dates & Time
Count days, plan deadlines, and move accurately through the calendar.
View Dates & Time overviewPercentages
Find percentages, compare changes, and work out discounts.
- Percentage Calculator
- Percentage Change Calculator
- Percentage Difference Calculator
- Discount Calculator
- Sales Tax Calculator
- Markup & Margin Calculator
Everyday Math
Handle tips, averages, fractions, ratios, and proportions.
View Everyday Math overviewMoney
Estimate take-home pay, plan a household budget, understand loans, and explore compound growth.
- Loan Payment Calculator
- Compound Interest Calculator
- Take-Home Pay Estimator
- Household Budget Calculator
Conversions
Convert common measurements with reliable standard factors.
- Length Converter
- Weight & Mass Converter
- Temperature Converter
- Area Converter
- Volume Converter
- Speed Converter
Home & DIY
Estimate materials for practical projects around the home.
View Home & DIY overviewClear answers, useful context
Each calculator keeps the main answer easy to find and provides the assumptions or formula needed to understand it. Favorites, recent tools, and calculation history stay in this browser and require no account.