Collection
Business Tools
Framed for someone running a business rather than writing software: the tax, percentage, unit and record-keeping jobs that come up in a week.
What is in this collection
Percentage Calculator
Solve percentage change, share and reverse-percentage problems.
Open toolGST Calculator
Add or strip GST at any rate and split it into CGST, SGST or IGST.
Open toolUnit Converter
Convert length, weight, temperature, area, volume, speed, time and data.
Open toolAge Calculator
Work out an exact age in years, months and days from a birth date.
Open toolTime Zone Converter
Convert and compare times across cities, with DST and meeting planning.
Open toolPassword Generator & Strength Checker
Create strong passwords and measure entropy, crack time and complexity.
Open toolMD5 Generator
Generate and verify MD5 checksums for text or files, entirely in the browser.
Open tool
The everyday commercial maths
GST added or stripped and split correctly across CGST, SGST and IGST. Percentages for margins, discounts and the reverse case where you have the inclusive figure and need the base. Units and time zones for suppliers and clients in other countries, and exact ages for records and forms.
The two account-hygiene tools
A password generator that reports entropy rather than a vague strength bar, and an MD5 checksum tool for verifying that a file you downloaded matches what the publisher shipped.