# Solver360

> Solver360 provides 3890 free online calculators with step-by-step solutions, formulas, theory, examples, and FAQs for mathematics, physics, chemistry, engineering, finance, health, and everyday topics.

## Primary pages

- [Home](https://solver360.com/): Browse all calculators and categories
- [All calculators](https://solver360.com/calculators): Full calculator directory
- [Categories](https://solver360.com/categories): Browse by subject
- [Blog](https://solver360.com/blog): Guides and tutorials
- [How to use](https://solver360.com/how-to-use): Using the tools
- [Editorial policy](https://solver360.com/editorial-policy): Content quality and review process
- [Accuracy](https://solver360.com/accuracy): How we verify formulas and results

## Discovery

- [Web app manifest](https://solver360.com/manifest.json): PWA install metadata and shortcuts
- [Sitemap index](https://solver360.com/sitemap.xml): XML sitemap for all public URLs
- [HTML sitemap](https://solver360.com/sitemap): Human-readable site map
- [Calculator registry](https://solver360.com/calculator-registry.json): Machine-readable list of calculator ids, names, and categories

## Calculator URL pattern

Individual calculators: `https://solver360.com/calculators/{calculator-id}`

Example: https://solver360.com/calculators/acceleration-calculator

## Contact

- [Contact](https://solver360.com/contact)
- Report issues: info@solver360.com

## Crawling notes

- Public content is allowed for search indexing via standard crawlers.
- See `/robots.txt` for AI training crawler policies (GPTBot, Google-Extended).