About

FormOasis exists to make it easier to find the answer you came for. Type a number, see the result, no sign-up, no clutter. Every calculator here runs live in the page, shows its formula, and answers the questions people ask about it.

Two kinds of visitor

If you just need a number, use the tools. They are free, they work on a phone, and they will stay that way. Ads and the occasional recommended plugin keep the lights on.

If you build WordPress sites, every calculator is also a Gravity Forms template you can put on your own site in a minute. Each tool page has a free, field-by-field build guide, and the template download gives you the exact form file plus a PDF walkthrough with screenshots of every setting. That is the second purpose of the site: a ready-made solution for Gravity Forms users who need a calculator and would rather not build it from scratch.

How the calculators are built

All of them are Gravity Forms forms. Most use only what ships in Gravity Forms: Number fields with calculations, choices with values, conditional logic. A few need exponents or date maths and use the GP Advanced Calculations syntax. The results you see are computed in your browser as you type; nothing is submitted or stored when you use a calculator.

Results are estimates for information, not financial, medical or legal advice. The “How it’s calculated” section on each tool shows exactly what the numbers do, so you can check them against your own situation.

Who runs it

FormOasis is built and run by WP Mantis, a small WordPress studio. Purchases on this site appear as WP Mantis on your card statement. If a tool is wrong, a download misbehaves or you have an idea for a calculator, the support page reaches a person.