Guides, tutorials and tips to get the most out of our tools.
Learn how to calculate percentage the easy way — the core formulas for "X% of Y", "X is what % of Y" and percentage change, with worked examples.
AZ Utils Editorial · · 8 min read
How to calculate the exact age difference between two people or events — in years, months and days — and why subtracting birth years gets it wrong.
AZ Utils Editorial · · 7 min read
Pin down your retirement date and the years remaining — how to calculate retirement age from your date of birth and avoid off-by-one planning errors.
AZ Utils Editorial · · 8 min read
Use an age calculator to confirm your child meets the school admission age as of the cut-off date — with examples of who qualifies and who misses out.
AZ Utils Editorial · · 7 min read
How to calculate age from a date of birth three ways — an online tool, manual subtraction and the DATEDIF spreadsheet formula — with examples.
AZ Utils Editorial · · 8 min read
Find out exactly how many days old you are — and why it is not just your age times 365. Count leap days, weeks and fun milestones.
AZ Utils Editorial · · 7 min read
Understand how age is calculated — the borrow-and-carry method, leap years and completed periods — with a clear worked example.
AZ Utils Editorial · · 8 min read
The most common GST mistakes — from reversing GST wrongly to mixing up CGST/SGST and IGST — and a simple pre-invoice checklist to avoid penalties.
AZ Utils Editorial · · 8 min read
Eight hands-on GST calculation examples — adding and removing GST, CGST/SGST split, inter-state IGST, discounts and a multi-slab invoice.
AZ Utils Editorial · · 8 min read
