# Free crochet tools and calculators

> 4 free crochet calculators on Crochet 3D: a sphere calculator, a pattern resizer, a yarn estimator and a US/UK terminology converter. No account, no sign-up.

**What makes these different from a calculator page.** This site has a pattern parser and a 3D renderer, so the answer can be a PATTERN rather than a table of numbers: the sphere calculator hands you the rounds and a button that opens them in the planner, and the resizer rewrites a pattern round by round instead of telling you to use thicker yarn. All of them are free and need no account.

## The tools

- [US to UK crochet terms](https://crochet3d.com/tools/us-uk-crochet-terms) — A UK double crochet is a US single crochet. Paste a pattern and get it back in the other dialect — plus the full conversion chart. Markdown: https://crochet3d.com/md/tools/us-uk-crochet-terms.md
- [How much yarn do I need?](https://crochet3d.com/tools/crochet-yarn-calculator) — Count a pattern's stitches exactly, then turn that into grams, metres and whole balls — calibrated from a project you have already made rather than a rule of thumb. Markdown: https://crochet3d.com/md/tools/crochet-yarn-calculator.md
- [Crochet pattern resizer](https://crochet3d.com/tools/crochet-pattern-resizer) — Make an amigurumi bigger or smaller by rebuilding it on a wider base — every round rewritten exactly, and a straight answer when a pattern cannot be scaled. Markdown: https://crochet3d.com/md/tools/crochet-pattern-resizer.md
- [Crochet sphere calculator](https://crochet3d.com/tools/crochet-sphere-calculator) — A ball in the size you need: enter a finished diameter and your gauge, get every increase and decrease round — and open the pattern in 3D. Markdown: https://crochet3d.com/md/tools/crochet-sphere-calculator.md

The [Learn pages](https://crochet3d.com/learn) explain the arithmetic these do, and the [pattern gallery](https://crochet3d.com/gallery) has finished patterns to try them on.

Source: https://crochet3d.com/tools