Guides

Each guide collects the calculators for one topic with the explainers that show how the numbers work.

Embedding calculators and widgets

Put Plainso tools on your own website — the embed code, theming, and sizing, plus the commercial case for calculators as lead capture.

Loans, investments, pay, and tax — the money calculators and plain-English guides that turn the numbers into decisions.

Pricing, margins, runway, and AI-assisted credibility — the business tools and guides for founders and small teams.

What to charge, how to quote, and how to price your time — freelance calculators and guides for independent work.

Percentages, age, and the everyday arithmetic worth getting exactly right — calculators and guides from Plainso.

Step-by-step guides for WordPress, Shopify, Webflow, and more — no plugins, no code.

Margin vs markup, ROI vs ROAS, hourly vs fixed — the metrics people mix up, side by side.