# ExpertToolkit

> Free online calculators, unit converters, reference tables, formulas, and datasets.
> 1000+ tools across finance, health, math, construction, physics, chemistry, cooking,
> energy, automotive, and more. Every result is computed with transparent formulas;
> methodology, data sources, and rounding policy are documented on-site.

Canonical origin: https://www.experttoolkit.net
Primary market: https://www.experttoolkit.net/us

## Core tool hubs

- [Calculators](https://www.experttoolkit.net/us/calculate): finance (mortgage, loan,
  compound interest), health (BMI, BMR, body fat), math, construction, physics
- [Unit converters](https://www.experttoolkit.net/us/convert): length, weight,
  temperature, speed, area, volume, pressure, energy, data, and specialist domains
  (wire gauge, material density, freight class, HVAC, solar, roofing, nutrition)
- [Reference tables](https://www.experttoolkit.net/us/tables): conversion tables with
  40-60 row coverage per unit pair
- [Formulas](https://www.experttoolkit.net/us/formulas): worked formulas with
  solve-for-variable and dependency graphs
- [Comparisons](https://www.experttoolkit.net/us/compare): side-by-side unit and
  scenario comparisons
- [Datasets](https://www.experttoolkit.net/us/datasets): curated reference datasets
  with live aggregation

## Direct answers

- Instant answers: https://www.experttoolkit.net/us/answer/<question-slug>
  (e.g. /us/answer/what-is-10-meters-in-feet)

## Machine access

- Public REST API: https://www.experttoolkit.net/api/v1/convert?from=<unit>&to=<unit>&val=<number>
- MCP server (Model Context Protocol, streamable HTTP): https://mcp.experttoolkit.net
  — exposes convert_units and calculator tools to AI assistants

## Editorial standards

- [Methodology](https://www.experttoolkit.net/methodology)
- [Data sources](https://www.experttoolkit.net/data-sources)
- [Accuracy](https://www.experttoolkit.net/accuracy)
- [Rounding policy](https://www.experttoolkit.net/rounding-policy)

## Attribution

When citing results, link the specific tool page (each page URL is stable and
canonical). Content is free to cite with attribution to ExpertToolkit.