Hey Product Hunt! I'm the creator of MixByParts, a free web tool I built after years of frustration with clunky charts and apps for dilution math in auto detailing and lab work. As a detailer and hobby chemist, I constantly needed quick, accurate calculations for ratios (e.g., 1:10 APC mixes or bleach to hit CDC PPM) - but existing options were ad-riddled, preset-only, or required downloads. What's new and unique? Unlike alternatives (e.g., generic ratio apps or Smooth-On's mold calculators), MixByParts handles custom ratios with any container size, toggles volume/weight modes, and supports real-world densities for multi-part systems—no presets needed. It's fully browser-based, zero popups, and covers niches like paint/epoxy/coolant mixing in one clean hub. Early users love the "copy label line" feature for bleach safety. Most proud of: The simplicity - pure numbers, no fluff. It saves time and reduces waste/errors, especially for pros juggling jobs. Tested it on real workflows; now scaling with user-requested hubs. What mixing pains do you have? Feedback welcome - let's iterate!

MixByParts

Instant dilution calculator for pros & DIY mixing math

Instant dilution calculator for pros & DIY mixing math