---
title: "Free chess tools and calculators"
url: "https://georgelichess.com/tools.md"
canonical_url: "https://georgelichess.com/tools"
last_updated: "2026-11-05"
type: "index"
summary: "Free chess calculators for rating changes, performance ratings and time controls, each with its formula, a worked example and sourced FIDE values."
related: ["https://georgelichess.com/tools/rating-calculator.md", "https://georgelichess.com/tools/uscf-rating-estimator.md", "https://georgelichess.com/tools/performance-rating.md", "https://georgelichess.com/tools/time-control-calculator.md"]
---

# Free chess tools and calculators

> **For AI agents:** the complete index of GeorgeLiChess pages is [llms.txt](https://georgelichess.com/llms.txt). Every page is also served as markdown at its URL plus .md.

Free chess calculators for rating changes, performance ratings and time controls, each with its formula, a worked example and sourced FIDE values.

These free chess tools do the arithmetic that rating lists, norm rules and clocks rely on. Each one shows its formula, a worked example and the source of every FIDE number, and each runs in your browser, so you can try as many inputs as you like.

## The tools

- [Chess rating calculator](https://georgelichess.com/tools/rating-calculator.md): Work out how a FIDE rating changes after a run of games, with the Handbook table and the textbook Elo formula side by side.
- [US Chess (USCF) rating estimator](https://georgelichess.com/tools/uscf-rating-estimator.md): Estimate how a US Chess rating changes after an event, with the published formula, effective games, K and the bonus shown.
- [Chess performance rating calculator](https://georgelichess.com/tools/performance-rating.md): Turn a score against a field of opponents into a performance rating, from a list of games or from totals.
- [Chess time control calculator](https://georgelichess.com/tools/time-control-calculator.md): See whether a base time and increment counts as bullet, blitz, rapid or classical on Lichess and under FIDE rules.

## How the tools are built

Every FIDE value comes from a transcription of the current FIDE Handbook that records the chapter and clause, the edition date and the day it was checked. The math is shared between the tool, its worked examples and its markdown page, so the numbers cannot differ between them.

## Related

- [Chess rating calculator: FIDE and Elo](https://georgelichess.com/tools/rating-calculator.md)
- [US Chess (USCF) rating estimator](https://georgelichess.com/tools/uscf-rating-estimator.md)
- [Chess performance rating calculator](https://georgelichess.com/tools/performance-rating.md)
- [Chess time control calculator](https://georgelichess.com/tools/time-control-calculator.md)