Nutrient Dilution & Final ECHydroponics Lab
Calculate multi-part liquid concentrate dosing volumes and estimate final solution EC levels.
Hydroponic root health depends on water temperature. Above 22°C (72°F), pythium pathogens thrive while oxygen levels drop. Keep reservoirs aerated and cool.
Explore Additional Utilities
Sidereal Time Converter
Convert between standard Solar Time and Sidereal Time based on your longitude.
Tephra thickness ↔ distance from vent — deposit mapping
Estimate tephra/ash fallout accumulation thickness over distance from eruptive vents.
Coal consumption — forge size ↔ hours ↔ kg of fuel
Forecast required metallurgical coal or coke fuel weight for active forge sessions.
Covering material — book size ↔ cloth/leather dimensions
Determine required dimensions for book cloth, leather hide, or cover board wrapping based on book block margins.
Wraps per inch (WPI) ↔ yarn weight category
Convert wraps per inch (WPI) count to standard yarn weight categories, and find recommended knitting needle/crochet hook sizes.
Thread length — stitch count ↔ thread needed
Calculate thread length needed for saddle stitching based on stitch line length, leather thickness, and spacing density.
Legal Billable Hours Estimator
Convert word count of legal drafting documents to estimated billable hours based on complexity and billing rates.
Spine width — page count + paper weight ↔ mm
Calculate spine width in millimeters from page count, paper weight (gsm or basis), and cover board thickness.
Infill density (% ↔ structural strength)
Estimate mechanical tensile strength and relative part weight based on infill percentage, material choice, and shell count.
Eye size — skull diameter ↔ glass eye mm
Estimate ideal glass taxidermy eye sizes (in mm) and pupil types from skull diameter, socket dimensions, or species.
Buoyancy — weight needed ↔ wetsuit thickness + water type
Determine required lead weight adjustments based on wetsuit thickness, water density (salt vs. fresh), and diver body metrics.
Dog Age ↔ Human Age Equivalent
Calculate the human age equivalent of a dog based on their age and breed size category (small, medium, large, or giant), using modern veterinary curves.
Gas mix — O2 % ↔ depth limit — MOD calculation
Calculate the Maximum Operating Depth (MOD) and partial pressure of oxygen (PPO2) for nitrox and air diving.
Leather weight — oz ↔ mm thickness
Convert leather weights in ounces to exact millimeter or fractional inch thickness. View target usage categories.
Recycling Weight & Resource Savings Calculator
Convert quantities of recycled materials (plastic, glass, paper, aluminum) into greenhouse gases, water, and landfill space saved.
Rivet size — leather thickness ↔ post length needed
Calculate the correct rivet post length based on your total leather material stack thickness and hardware style.
Pulp consistency — dry fiber % ↔ water ratio
Calculate dry fiber weight percentage in wet pulp slurry and water mixing dilution ratios for vat dipping.
Karat purity (Karat ↔ Fineness ↔ % gold)
Convert gold purity levels between Karat values, parts-per-thousand millesimal fineness, and pure gold percentage.
Tidal current ↔ drift
Calculate course to steer and speed over ground (or set and drift) to compensate for tidal current and wind leeway.
Sail area ↔ displacement ratio
Calculate Sail Area to Displacement Ratio (SADR) to evaluate a sailboat’s performance characteristics, speed potential, and light-wind capability.