Frequently Asked Questions

Today Calculator is a comprehensive online platform offering over 5000 free calculation tools. We provide calculators for mathematics, finance, health, unit conversions, and daily life calculations.

Our mission is to make complex mathematical problems simple and accessible to everyone, from students to professionals.

No! All our calculators are completely free to use without any registration. Simply visit any calculator page and start calculating immediately.

We believe in making mathematics accessible to everyone, so we've eliminated all barriers to using our tools.

We currently offer over 5000 specialized calculators across six main categories:

• Math & Algebra (800+): Basic arithmetic to advanced mathematics
• Finance & Money (900+): Loans, investments, and financial planning
• Health & Fitness (700+): Health metrics and fitness calculations
• Unit Conversions (1200+): All measurement conversions
• Daily Life (600+): Everyday practical calculations
• Science & Engineering (800+): Technical and scientific calculations

We're constantly adding new calculators based on user feedback and emerging needs.

Yes! All our calculators are completely free to use and will always remain free. We don't charge any fees, require subscriptions, or have premium features.

Absolutely! All our calculators are fully responsive and work perfectly on:

• 📱 Smartphones (iOS and Android)
• 📱 Tablets (iPad, Android tablets)
• 💻 Desktop computers
• 💻 Laptops

The interface automatically adapts to your screen size for the best user experience. All features work identically across all devices.

Today Calculator is designed for everyone:

• Students: Elementary to university level mathematics
• Professionals: Engineers, accountants, scientists, researchers
• Business owners: Financial planning and business calculations
• Homeowners: Mortgage, renovation, and household calculations
• Teachers: Educational tools for classroom use
• Anyone: Who needs quick, accurate calculations

We offer several ways to find the perfect calculator:

• Search Bar: Type keywords like "BMI", "mortgage", or "percentage"
• Browse Categories: Explore our six main categories
• Popular Calculators: Check our most frequently used tools
• Related Suggestions: See similar calculators on each page

Our search function provides instant results as you type, making it easy to find exactly what you need.

Yes! We provide comprehensive customer support:

• Email Support: [email protected]
• FAQ Section: Comprehensive answers to common questions
• How-to Guides: Step-by-step instructions
• Bug Reports: Quick resolution of any issues

We typically respond to all inquiries within 24 hours during business days.

Several key factors set us apart:

• Comprehensive: 5000+ calculators in one place
• Privacy-focused: No data collection or tracking
• Lightning-fast: Instant calculations with no server delays
• Always free: No subscriptions or hidden fees
• Highly accurate: 99.9% accuracy rate with industry-standard formulas
• User-friendly: Clean, intuitive interface design

Absolutely! We love hearing from our users and regularly add new calculators based on suggestions.

To suggest a new calculator:

• Email us at [email protected]
• Describe the type of calculation you need
• Explain how it would be useful
• Provide any relevant formulas or examples

We review all suggestions and prioritize those that would benefit the most users.

Our calculators provide instant results! All calculations are performed locally in your browser using optimized JavaScript, which means:

• ⚡ No server delays: No waiting for network requests
• ⚡ Millisecond responses: Results appear instantly
• ⚡ Real-time updates: Many calculators update as you type
• ⚡ Works offline: Functions without internet connection once loaded

Our calculators work on all modern browsers:

• 🌐 Chrome (recommended for best performance)
• 🌐 Firefox
• 🌐 Safari
• 🌐 Edge
• 🌐 Opera

If results don't appear, try these troubleshooting steps:

• ✅ Ensure all required fields are filled
• ✅ Use only numbers (no letters or symbols)
• ✅ Check for valid input ranges
• ✅ Refresh the page and try again
• ✅ Clear browser cache and cookies
• ✅ Disable browser extensions temporarily
• ✅ Try a different browser

If problems persist, contact us with your browser details and the specific calculator.

Currently, we don't offer a public API, but we're considering it for future development.

For integration needs:

• Contact [email protected]
• Describe your integration requirements
• We'll discuss potential solutions

You can currently embed our calculators using iframe integration.

Yes! Once a calculator page loads, it works offline because:

• All calculations happen in your browser
• No server connection required for calculations
• JavaScript runs locally on your device

Our calculators require JavaScript to function because all calculations are performed locally in your browser for privacy and speed.

Without JavaScript:

• Calculators won't perform calculations
• Interactive features won't work
• You'll see a message to enable JavaScript

JavaScript is enabled by default in all modern browsers.

Our calculators are designed to handle a wide range of numbers:

• Standard Numbers: Up to 15-16 significant digits
• Scientific Notation: For very large or small numbers
• Precision: Appropriate precision for each calculation type
• Overflow Protection: Warnings for numbers too large to process

Different calculators may have different limits based on their specific requirements.

Yes! Many of our calculators support keyboard shortcuts:

• Enter: Calculate/Submit in most calculators
• Tab: Navigate between input fields
• Escape: Clear inputs in some calculators
• Arrow Keys: Navigate dropdown menus

Specific shortcuts may vary depending on the calculator type.

Yes, completely safe! Your privacy is our top priority:

• 🔒 No data collection: We don't store your inputs or results
• 🔒 Local processing: All calculations happen in your browser
• 🔒 No transmission: Your data never leaves your device
• 🔒 No tracking: We don't track your calculation history

We use minimal, non-tracking cookies only for:

• Essential website functionality
• Remembering your preferences (like theme)
• Basic analytics (anonymized)

We never store: Calculation data, personal information, or sensitive data in cookies.

You can disable cookies without affecting calculator functionality.

Yes! We are fully GDPR compliant because:

• We don't collect personal data unnecessarily
• All data processing is transparent
• You have full control over your data
• Clear privacy policies are provided

European users can exercise all GDPR rights, though there's minimal data to manage.

No! We do not sell, trade, or share your information with third parties.

The only exceptions are:

• Essential service providers (hosting, analytics) with strict agreements
• Legal requirements (which we don't anticipate)

Since we don't collect calculation data, there's nothing sensitive to share.

Yes! Our calculators are safe for children because:

• No personal information is collected
• No registration or accounts required
• Educational content is appropriate
• No inappropriate advertisements

Teachers can safely use our calculators in educational settings.

Since we don't collect calculation data, there's typically no data to delete. However:

• Clear your browser's local storage
• Delete cookies from our site
• Contact us if you've sent emails or feedback

We'll respond to any data deletion requests within 30 days.

Our calculators maintain a 99.9% accuracy rate through:

• 📐 Industry-standard formulas: Established mathematical formulas
• 📐 Rigorous testing: Tested with known inputs and outputs
• 📐 Expert review: Reviewed by subject matter experts
• 📐 Regular updates: Updated when standards change

Yes! You can easily save or share your results:

• Copy & Paste: Copy results to clipboard
• Print: Use browser's print function
• Screenshot: Take screenshots of results
• Bookmark: Save calculator pages for later
• Share URL: Share calculator links with others

Many of our calculators include educational features:

• Formula Display: Show the formulas used
• Step-by-Step: Break down complex calculations
• Explanations: Explain the calculation process
• Examples: Provide worked examples

This helps you understand not just the result, but how it was calculated.

Absolutely! You can:

• Open multiple calculator tabs
• Use different calculators simultaneously
• Switch between calculators without losing data
• Compare results across different calculators

Each calculator operates independently without affecting others.

Yes! Our calculators support multiple unit systems:

• Metric System: Meters, kilograms, Celsius
• Imperial System: Feet, pounds, Fahrenheit
• International Units: Scientific and engineering units
• Automatic Conversion: Many calculators handle conversions automatically

Yes! Our calculators are used by professionals in:

• Engineering: Structural, mechanical, electrical calculations
• Finance: Investment analysis, loan calculations
• Healthcare: Medical calculations and assessments
• Education: Teaching and academic research
• Construction: Building and renovation calculations

Yes! We maintain our calculators through:

• Monthly: Bug fixes and minor improvements
• Quarterly: Formula updates and new features
• Annually: Major updates and new calculators
• As needed: Emergency fixes and regulatory updates

All updates are automatic - you always get the latest version.