About ToDye
ToDye is a small, independent, advertising-supported site built around six free fabric-dyeing calculators, a set of dyeing guides, and a Dyes & Textiles Museum — that’s the whole operation, run from this one domain and nowhere else.
How the Calculators Work
The two measurement tools convert real textile units instead of approximating them. The Yarn Count Converterroutes every value — tex, dtex, denier, the metric count (Nm), and the cotton count (Ne) — through a common tex base, so a conversion between, say, Ne and denier is really two conversions chained through tex rather than a rough lookup table. The Fabric GSM Calculatortakes a swatch’s weight and area and returns grams per square metre plus the ounces-per-square-yard equivalent, so you can characterise a fabric before you buy it or dye it.
The recipe and cost tools are built on the depth-of-shade method that fibre-reactive dyeing actually uses. The Dye Recipe Calculator takes your fabric weight, target shade percentage, and liquor ratio and turns them into a recipe you can weigh out: dye, water, salt, and soda ash for an immersion bath. The Dye Cost Estimatoruses those same inputs plus your dye price to work out what the batch actually costs — dye, auxiliaries, and labour, totalled and per kilogram of fabric.
The Dyeing Eco-Impact Calculator estimates the water, energy, carbon, and chemical load of a batch from the fabric weight, the dye process you’re running, and the liquor ratio, so you can see how tightening the bath or switching to a natural dye changes the picture. The Color Mixing Calculator works from ratios instead: enter a mix like 1:1:2 and a batch weight, and it returns the exact proportions and weigh-out grams for each color so a shade can be reproduced batch after batch.
None of this is proprietary research. The conversions and formulas behind these tools are standard, published dyeing and textile methods — the same depth-of-shade logic, liquor-ratio math, and unit conversions a working dye studio already uses on paper or in a spreadsheet. What the calculators add is that they do the arithmetic quickly and show the working, so you can check it against your own numbers.
What This Is — and Isn’t
ToDye is not a dye manufacturer, a testing lab, or a textile-standards body, and it isn’t affiliated with any brand, certification scheme, or standard it happens to mention. Every figure a calculator returns is an estimate based on the numbers you enter and on general dyeing conventions — not a lab result, and not a guarantee of a particular outcome on your fibre, water, or dye lot.
Dyeing involves chemicals and heat. Nothing on this site replaces the safety data sheet for your dye or auxiliary, and no calculator can tell you whether a product is safe for your setup — wear appropriate protective equipment, work in a ventilated space, and test any recipe on a sample swatch before committing a full batch to it.
Beyond the calculators, the site carries dyeing guides under Learn, occasional articles on the blog, and the Dyes & Textiles Museum, which draws its entries, images, and facts from Wikipedia and Wikimedia Commons rather than original research. Advertising on these pages is what keeps the tools free to use.
Found a mistake in a formula, or want a tool that doesn’t exist yet? Get in touch.