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Math Tools

Essential mathematics calculators and converters

Scientific Calculator

Advanced scientific calculator for complex mathematical operations

  • Basic Arithmetic
  • Trigonometric Functions
  • Logarithms
  • Powers & Roots
  • Common Constants

Percentage Calculator

Calculate percentages, percentage change, and reverse percentages

  • Percentage Of
  • Percentage Change
  • Reverse Percentage
  • Percentage Difference
  • Quick Modes

Percentage Change Calculator

Calculate the percentage increase or decrease between two values

  • Increase/Decrease
  • Step-by-step
  • Visual graph
  • Financial use

Percentage Difference Calculator

Calculate the percentage difference between two numbers

  • Difference
  • Average
  • Comparison
  • Step-by-step

Reverse Percentage Calculator

Find the original value before a percentage was applied

  • Find original
  • Decimal math
  • Reverse calc
  • Step-by-step

Percentage Of Calculator

Calculate what percentage one number is of another

  • Percentage part
  • Decimal math
  • Step-by-step
  • Simple tool

Tip Calculator

Calculate tip, split bills and totals

  • Tip by percentage
  • Split among people
  • 10%, 15%, 20% shortcuts
  • Total including tip
  • Per-person amount

Fraction Calculator

Add, subtract, multiply, and divide fractions

  • Simplify fractions
  • Mixed numbers
  • Decimal conversion
  • Step-by-step

Time Calculator

Add, subtract, and calculate time duration

  • Time difference
  • Add/Subtract
  • Hours/Minutes
  • Days conversion

Date Calculator

Calculate duration between dates or add/subtract days

  • Days between
  • Add days
  • Work days
  • Age calculation

Calendar Converter

Convert dates between different calendar systems

  • Gregorian
  • Julian
  • Hebrew
  • Islamic
  • Create your own

Buddhist to Gregorian

Convert Buddhist calendar dates to Gregorian

  • Conversion
  • Date matching
  • History
  • Simple tool

Chinese to Gregorian

Convert Chinese calendar dates to Gregorian

  • Lunar dates
  • Solar terms
  • Zodiac
  • Conversion

Ethiopian to Gregorian

Convert Ethiopian calendar dates to Gregorian

  • Ethiopian months
  • Leap years
  • Conversion
  • Simple tool

Gregorian to Buddhist

Convert Gregorian dates to Buddhist calendar

  • BE years
  • Thai format
  • Conversion
  • Simple tool

Gregorian to Chinese

Convert Gregorian dates to Chinese calendar

  • Lunar year
  • Month/Day
  • Conversion
  • Simple tool

Gregorian to Ethiopian

Convert Gregorian dates to Ethiopian calendar

  • Amharic
  • 13 months
  • Conversion
  • Simple tool

Gregorian to Hebrew

Convert Gregorian dates to Hebrew calendar

  • Jewish dates
  • Holidays
  • Conversion
  • Simple tool

Gregorian to Hindu

Convert Gregorian dates to Hindu calendar

  • Vikram Samvat
  • Tithi
  • Conversion
  • Simple tool

Gregorian to Islamic

Convert Gregorian dates to Islamic (Hijri) calendar

  • Hijri years
  • Lunar months
  • Conversion
  • Simple tool

Gregorian to Julian

Convert Gregorian dates to Julian calendar

  • Old style
  • History
  • Conversion
  • Simple tool

Gregorian to Persian

Convert Gregorian dates to Persian (Jalali) calendar

  • Solar Hijri
  • Iran/Afghan
  • Conversion
  • Simple tool

Hebrew to Gregorian

Convert Hebrew calendar dates to Gregorian

  • Jewish dates
  • Civil conversion
  • Holidays
  • Simple tool

Hindu to Gregorian

Convert Hindu calendar dates to Gregorian

  • Panchang
  • Solar/Lunar
  • Conversion
  • Simple tool

Islamic to Gregorian

Convert Islamic (Hijri) dates to Gregorian

  • Hijri dates
  • Adjustment
  • Conversion
  • Simple tool

Julian to Gregorian

Convert Julian calendar dates to Gregorian

  • Old date
  • New date
  • Difference
  • History

Persian to Gregorian

Convert Persian (Jalali) dates to Gregorian

  • Jalali years
  • Solar
  • Conversion
  • Simple tool