Useful math for everyday problems
Useful calculators for everyday problems
Calculate dates, percentages, money, measurements, and other everyday math quickly and clearly.
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 overviewYour saved tools
Recently used
Clear 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.