What Webtilly is
Webtilly builds free calculators and tools for the numbers that drive decisions: SaaS metrics, marketing ROI, e-commerce margins, creator rates and business finance. Every calculator shows its formula, works through an example and names its source.
Why it exists
Most calculator sites give you a number and nothing else. Webtilly shows the math, says where it comes from and explains what the result means, so you can check it before you rely on it.
Who is behind it
Webtilly is written and maintained by the Webtilly team. We use AI tools to help research and draft, and a person checks every page before it is published. Our editorial policy sets out how, and our methodology explains how each calculator is built.
We do not yet have independent expert reviewers. When we do, they will be named on the pages they reviewed and listed on the reviewers page.
What we cover
We are starting with SaaS metrics, then moving to marketing, e-commerce, creators and business decisions such as valuation, ROI and runway. We will not publish loan, tax or payroll calculators until a suitably qualified reviewer is in place.
Contact
Questions, corrections and reviewer enquiries: hello@webtilly.com.