Small, fast, privacy-friendly calculators. Everything runs in your browser — no signup, no uploads.
Etsy Fee Calculator — see exactly what Etsy takes per sale: itemized fees, net profit, margin, plus a reverse mode (want $X profit → get the price).
Resize or compress a photo or signature to an exact KB target (20KB, 50KB, 100KB…) — 100% in your browser, your photo never leaves your device.
Knitting & crochet: stitches and rows from your gauge, and how much yarn you need in meters, grams and balls.
How much fabric for curtains, a circle skirt or any rectangular project — for 45" and 60" bolts, yards or meters.
Exact epoxy volume for rectangular or round pours, mix ratios by volume or weight, waste factor and cost estimate.