OpenCalculator Free online calculators.
Calculate, share, done. Use 35 free calculators for percentages, GPA, tips, paychecks, compound interest, graphing, and more. See the steps, share a result, or export it to PDF and Excel. No sign-up.
Math calculators
All math calculatorsFinance calculators
All finance calculatorsEveryday calculators
All everyday calculatorsTime and dates calculators
All time and dates calculatorsGrades calculators
All grades calculatorsPaycheck calculators
All paycheck calculatorsGraphing calculators
All graphing calculatorsAlgebra and calculus calculators
All algebra and calculus calculatorsHealth calculators
All health calculatorsBenefits calculators
All benefits calculatorsFind the right calculator for your question
Start with the numbers you know. Open a full calculator for the formula, worked examples, and export options, or use the compact calculators above for a quick answer.
- Work out a percentage or price
- Use the percentage calculator for percent change and reverse percentages, the discount calculator for sale prices, or the tip calculator to split a bill.
- Plan savings and take-home pay
- Compare growth with the compound interest calculator and savings calculator. Estimate net pay with the paycheck calculator by state.
- Check grades and exam targets
- The GPA calculator combines course grades and credits. Use the final grade calculator to find the exam score needed for your target grade.
- Count dates and work hours
- Find elapsed days with the date calculator, age in years and months with the age calculator, or paid time after breaks with the hours calculator.
- Explore a function or solve an equation
- Plot functions in the graphing calculator, evaluate expressions in the scientific calculator, or work through symbolic derivatives and integrals.
Answers you can check and reuse
OpenCalculator (Open Calculator) puts the calculation beside its explanation. Full pages include examples and assumptions so you can check what a result means. Share a calculation link with its inputs, download an answer, or pick several tools to build your own calculator page.
Learn about OpenCalculator or read our calculation methods, data sources, and limitations.
Using OpenCalculator
What is OpenCalculator?
OpenCalculator, also called Open Calculator, is a collection of free online calculators at opencalculator.app. Use it for everyday math, school grades, money estimates, dates, graphing, and algebra without creating an account.
Can I save or share a calculation?
Yes. Open a calculator page to copy a link with your inputs, share an answer image, or download a PDF or Excel file. You can also pick several calculators on the homepage and share them together as one page.
Do Excel downloads contain formulas?
Supported calculators export spreadsheets with live formulas and a blank template. Other calculators export their inputs, results, and worked steps as values. Each calculator page indicates when a formula template is available.
How accurate are the results?
Math tools use the formulas described on each page. Tax, paycheck, benefit, health, and exam-score results depend on assumptions and can be estimates. Review the stated units, data year, sources, and limitations before relying on a result.