Math

Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal bases instantly.

Date & Time

Business Days Calculator

Count the number of working days between two dates, excluding weekends and optional public

Finance

One Rep Max Calculator

Estimate your one-rep max (1RM) for any lift using weight lifted and number of reps perfor

Everyday

Roman Numeral Converter

Convert between Roman numerals and Arabic numbers instantly. Supports values from 1 to 399

Date & Time

Working Days Calculator

Calculate the number of working days between two dates, excluding weekends and optional pu

Statistics

Mean Median Mode Calculator

Calculate mean, median, mode, range and standard deviation for a set of numbers.

Everyday

Binary to Decimal Converter

Convert between binary, decimal, hexadecimal, and octal number systems instantly.

Math

GCD and LCM Calculator

Calculate the Greatest Common Divisor (GCD) and Least Common Multiple (LCM) of two or more

Date & Time

Add Days to Date Calculator

Add or subtract any number of days from a date to find a future or past date instantly.

Math

Prime Number Checker

Check if a number is prime and find all prime factors of any number instantly.

Everyday

Number to Words Converter

Convert any number up to one trillion into words in English. Useful for cheques, invoices,

Date & Time

Calendar Week Number Calculator

Find the ISO week number of any date and see the start and end dates of that week.

Everyday

IP Subnet Calculator

Calculate network address, broadcast address, host range, and number of hosts for any IPv4