Help & Documentation
Complete guide to using all Calc Plus calculators and features
General Tips
Navigation
- • Use Tab to navigate between input fields
- • Press Enter to calculate results
- • Use Ctrl+C to copy results
- • All calculations are performed locally in your browser
Features
- • History tracking for all calculators
- • Copy results to clipboard
- • Responsive design for all devices
- • Accessibility support for screen readers
Calculator Documentation
VAT/TVA Calculator
Calculate VAT forward (HT→TTC) and reverse (TTC→HT)
Features
- • Forward VAT calculation (add VAT to base amount)
- • Reverse VAT calculation (extract VAT from total)
- • Multiple VAT rates support
- • Precise decimal calculations
- • History tracking
Keyboard Shortcuts
- • Tab: Navigate between fields
- • Enter: Calculate result
- • Ctrl+C: Copy result
Standard Calculator
Full-featured calculator with memory functions
Features
- • Basic arithmetic operations (+, -, ×, ÷)
- • Memory functions (MC, MR, M+, M-, MS)
- • Decimal point support
- • Chain calculations
- • Copy to clipboard
Keyboard Shortcuts
- • 0-9: Number input
- • +, -, *, /: Operations
- • Enter or =: Calculate
- • Escape: Clear all
- • Backspace: Delete last digit
- • Ctrl+C: Copy result
Percentage Calculator
7 different percentage calculation modes
Features
- • X% of Y calculations
- • Add percentage to value
- • Subtract percentage from value
- • Reverse percentage calculations
- • Percentage increase/decrease
- • Percentage difference between values
- • Step-by-step explanations
Keyboard Shortcuts
- • Tab: Navigate between fields
- • Enter: Calculate result
Average Calculator
Statistical analysis with comprehensive metrics
Features
- • Mean (arithmetic average)
- • Median (middle value)
- • Mode (most frequent value)
- • Standard deviation and variance
- • Min/max values and range
- • Quartiles and IQR
- • Multi-line data input support
Keyboard Shortcuts
- • Ctrl+V: Paste data
- • Ctrl+A: Select all data
- • Ctrl+C: Copy results
Time Calculator
Add and subtract time durations
Features
- • Multiple time formats (HH:MM:SS, H:MM, text)
- • Add and subtract operations
- • Automatic time normalization
- • Time presets for common durations
- • Swap times feature
Keyboard Shortcuts
- • Tab: Navigate between fields
- • Enter: Calculate result
Time Converter
Convert between time formats and decimal hours
Features
- • Time to decimal hours conversion
- • Decimal hours to time conversion
- • Configurable decimal places (2-4)
- • Bidirectional conversion
- • Format validation
Keyboard Shortcuts
- • Tab: Navigate between fields
- • Enter: Convert
Power Calculator
Powers, roots, and exponential calculations
Features
- • General power calculations (x^y)
- • Square and cube operations
- • Square root and cube root
- • Natural logarithm and log base 10
- • Exponential function (e^x)
- • Reciprocal calculations
Keyboard Shortcuts
- • Tab: Navigate between fields
- • Enter: Calculate result
Date Difference Calculator
Calculate precise differences between dates
Features
- • Years, months, and days calculation
- • Total days between dates
- • Business days calculation
- • Leap year handling
- • Date presets for common dates
- • Include/exclude end date option
Keyboard Shortcuts
- • Tab: Navigate between fields
- • Arrow keys: Adjust date values
Frequently Asked Questions
Are my calculations private?
Yes, all calculations are performed locally in your browser. No data is sent to our servers, ensuring complete privacy of your calculations.
How accurate are the calculations?
We use the decimal.js library to eliminate floating-point errors, ensuring precise calculations for financial and scientific purposes.
Can I use these calculators offline?
Once loaded, the calculators work offline. However, you need an internet connection to initially load the application.
Are there any usage limits?
No, there are no usage limits. All calculators are completely free to use without registration or restrictions.