About

This project was started to apply the web front-end, back-end, and JavaScript functions learned.
OwOb is operated on Cloudflare pages, and the OwOb API server is being developed and operated using Cloudflare workers and Hono Library.

OwOb

Age Calculator

Tool to calculating age and date of birth by adding or subtracting time

Date of Birth
Age at the Date of

Calculator

Calculators specialized for specific calculations rather than simple arithmetic calculators

Math

Tool to calculating simple fraction arithmetic operations
Fraction Calculator
Tools to calculate percentages of numbers, percentage changes, and the values for which percentages are given.
Percentage Calculator
Tool to calculate x value for quadratic equation of the form Ax2+Bx+C
Quadratic Formula Calculator
Tool to convert decimals to fractions
Decimal to Fraction Calculator
Tool to convert fractions to decimals
Fraction to Decimal Calculator

Time & Date

A tool for adding and subtracting time (days, hours, minutes, seconds and milliseconds)
Time Calculator
Tool to calculate time elapsed between dates or times
Time Duration Calculator
Tool to convert time in hh:mm:ss.fff format to decimal hours, minutes, seconds, and milliseconds
Time to Decimal Calculator
Tool to calculating age and date of birth by adding or subtracting time
Age Calculator

Health & Fitness

Tool to calculate body mass index (BMI) and classify it based on data from WHO and CDC
BMI Calculator
Tool to calculate optimal healthy weight using many popular equations based on age, gender, height
Ideal Weight Calculator
Tool to calculate basal metabolic rate (BMR) using well-known algorithms
BMR Calculator
Tool to estimate how much protein you need each day to stay healthy
Protein Calculator
Tool to calculate the right bra size based on breast size
Bra Size Calculator

Miscellaneous

Tools to convert units such as length, temperature, area, volume, weight and time
Unit Converter