Small tools. Mighty results.
Useful calculators and everyday helpers, built right here and free to use. Choose a tool from the list and get an answer without leaving the page.
Loan payment calculator
Calculate payments instantly. Explore interest, extra payments, and the complete amortization schedule.
Amortization schedule
Every payment, broken down. The extra payment is included when entered above.
| Payment | Date | Total paid | Principal | Interest | Balance |
|---|
Showing the first 12 payments.
Choose two dates
Weekdays are Monday–Friday; public holidays are not subtracted.
Find a percentage
Find the percentage change
Percentage change = (new − old) ÷ |old| × 100. It is undefined when the starting value is zero.
Choose a unit type
Conversions are approximate and intended for everyday use.
Ready to paste into Excel or another app.
THE EXCEL SIDE OF THINGS
Excel is powerful.
Make it work harder.
From a quick spreadsheet cleanup to a custom VBA macro, TheMightyMacro is also a home for practical Excel solutions.
The online tools are free. Custom-built Excel automation is a separate, paid service.
Explore custom macro servicesClean and reorganize messy data
↗Automate repetitive reports
↗Build custom workbook workflows
↗Fix or improve existing VBA
↗WHY THIS EXISTS
Useful beats complicated.
Some problems need powerful software. Others just need a good little tool that gets the job done. TheMightyMacro is here for the second kind — with an extra soft spot for spreadsheets.
Our current calculators and text tools run locally in your browser. We don't ask you to create an account or upload your numbers to our servers.
KEEP THE TOOLBOX FREE
A little support goes
a long way.
The tools are free to use. No paywalls, no guilt trips. If something here saved you time, an optional contribution helps keep the toolbox growing.