Finance Tools
Finance Tools — guides, articles and tools from CalcaTools covering every topic in this category. Free, fast, browser-based explainers with no sign-up.
$20 an Hour Is How Much a Year? (Convert Any Hourly Wage)
Convert hourly pay to a yearly salary: rate x hours x 52, or rate x 2,080 for full-time. Includes a conversion table and gross vs take-home pay explained.
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Sales Tax 101: How to Calculate, Reverse-Calculate, and A…
Whether you are pricing for retail, filing taxes, or just budgeting groceries, this is how sales tax actually works and how to reverse it.
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Compound vs. Simple Interest: The Math That Quietly Doubl…
Same rate, same principal — wildly different outcomes. Here is what compound interest actually does to your money, and when simple interest still wins.
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The Mortgage Payment Formula Explained: How Lenders Reall…
A plain-English breakdown of the PMT formula every lender uses, the four numbers that move your payment the most, and how to model it in two minutes.
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