All Crafts & Hobbies Tools
Knitting Gauge Calculator
Convert gauge swatches and calculate exact stitch and row counts for any knitting or crochet project
Sewing Pattern Size Calculator
Enter your body measurements and find the right pattern size across Simplicity, Vogue, Butterick, and Burda
Soap & Lye Calculator
Calculate exact NaOH or KOH and water amounts for cold process and liquid soap recipes
Tattoo Size & Placement Visualizer
Preview actual tattoo dimensions on body areas and estimate cost before your appointment
Yarn Calculator
Calculate how many yards and skeins you need for any knitting or crochet project
YouTube Thumbnail Preview
Preview how your thumbnail looks in YouTube search results, home feed, sidebar, and mobile — before you upload
Crafts & Hobbies on FastTools are free, browser-based tools designed to help you get quick answers without signups or downloads. Every calculator runs entirely in your browser — your data never leaves your device.
Whether you're planning, budgeting, or just curious, these tools are built to be fast, accurate, and private. Pick any tool below to get started instantly.
Frequently Asked Questions
Are these crafts & hobbies free?
Yes, every tool is completely free to use with no signup, no account, and no hidden fees.
Is my data safe?
Absolutely. All calculations run locally in your browser. No data is sent to any server or stored anywhere.
Do I need to create an account?
No. Every tool works instantly with no registration required. Just open and start using.