Riatto Lab

Calculate the real cost of quality vs. fast fashion over time. Compare cost-per-wear, yearly spend, CO₂ impact, and water use across 7 garment types.

Calculate precise Ferric Ammonium Citrate & Potassium Ferricyanide ratios for cyanotype.

Calculate proportions for mineral/plant-based paints (vegan, no animal dyes).

Calculate exact pressing durations for flowers, ferns, leaves and botanical specimens. Adjusts for plant type, thickness, press method, humidity and temperature using 1860s herbarium science.

Interactive color wheel showing how colors change appearance based on their background.

Calculate the exact pendulum length for any BPM — from grandfather clocks to music metronomes. Based on 1826 horological standards.

Encrypt and decrypt messages using the 1586 polyalphabetic substitution cipher.

Interactive visual and audio trainer for memorizing Morse code patterns using 1899 telegraphy manuals.

Calculate exact alum, iron, or tannin mordant ratios for 7 vegan fibers using the 1882 WOF textile standard. Includes dye plant reference table.

Calculate manual camera exposure settings using the classic Sunny 16 rule.

Calculate slot width and rotation speed for DIY zoetrope animation.

Calculate the resonant frequency of bottles, speaker ports, and acoustic cavities using Helmholtz's 1863 formula — with animated cross-section SVG and 7 presets.

Calculate perfect stereo photo alignment using 1838 Wheatstone optics. Input your IPD and print dimensions for strain-free 3D viewing.

Generate precise hand-cut dovetail layouts with dimension bracket annotations — Victorian technical drawing aesthetic, 6 project presets, slope reference table.

Translate Victorian knitting terms to modern language — 80+ terms across 14 categories, reactive stitch swatch SVG, era reference table.

Calculate the glass angle and lighting placement for creating Pepper's Ghost optical illusions.

Calculate precise hour line angles for DIY horizontal sundials based on your GPS latitude. Stone dial preview, gnomon geometry, construction guide, and photography cross-links.

Calculate perfect jump ring dimensions for European 4-in-1, Byzantine, Full Persian, and 8 more weaves. Includes mandrel guide, wire material picker, and weave reference table.

Generate a distorted polar grid for creating optical illusion art. Draw on the grid, place a mirror at center, and the image appears normal in the reflection.

Calculate loom sett (threads per inch) from yarn WPI for plain weave, twill, tapestry, or rug. Project presets, reed recommendations, and weft PPI.

Calculate the perfect coffee-to-water ratio for 8 brewing methods — with roast-level adjustment and flavor tuning guide.

Calculate exactly how far away a storm is by measuring the time between lightning and thunder. Uses temperature-adjusted sound speed for 100% accuracy.

Flip numismatic coins from four historic eras — Gold Eagle, Morgan Silver, Lincoln Bronze, Roman Sestertius. Track heads/tails streaks, batch-flip up to 50 at once, and watch the law of large numbers converge in real time.

Calculate cord lengths for Kumihimo braids — Edo Yatsu, Kara Gumi, Naiki flat, and beaded styles. Includes take-up reference, braid style guide, and material selector.

Estimate a tree's age from its circumference using ISA growth factors for 23 common species.

Convert text to NATO phonetic alphabet (Alfa Bravo Charlie). Perfect for radio communication, aviation callsigns, and clear phone spelling.

Calculate your weight on all 8 planets, the Moon, Pluto, and the Sun. Uses NASA Planetary Fact Sheet gravity data. Interactive solar system SVG.

Generate Classic Latin, Cat, Lab, Garden, or Nautical placeholder text for design mockups. Five themed modes, scenario presets, HTML/Markdown output, and download — free for designers and developers.

Calculate exactly how much ribbon you need to make any bow style: classic hand-tied, florist pull bow, pompom, wired layered, or curling ribbon. Step-by-step instructions included.

Roll virtual polyhedral dice (d4–d20) and track probability distribution. Visualize the Law of Large Numbers with interactive bar charts.

Convert any frequency in Hz to its nearest musical note with cents offset. Supports A440, A432, Baroque and historical tuning references.

Find the best moon phase for planting, harvesting, pruning, and garden care. Full gardening guide for all 8 phases, 29-day lunar calendar, and seasonal presets from Spring Equinox to Samhain.

Calculate exactly how much acrylic paint and pouring medium you need for any canvas size and pour technique. Supports dirty pour, swipe, ring pour, Dutch pour, bloom, and string pull with 8 canvas presets.

Scale any reference image to any canvas size using the classic artist grid method. Calculate source and target cell sizes for perfect proportions — the same technique used by Leonardo da Vinci and Albrecht Dürer.

Calculate exactly how much elastic cord to cut for any stretch bracelet. Accounts for bead diameter (π × D formula), wrist ease, and knot allowance — includes wrist size chart, elastic type guide, and Surgeon's Knot instructions.

Calculate total magnification, field of view, Abbe resolution limit, and digital on-screen magnification for any microscope setup. Includes empty magnification warning and specimen size estimator.