Yarn Weight Converter
Convert yarn sizes across WPI (Wraps Per Inch), ply, and standard Craft Yarn Council weight categories.
WPI (Wraps Per Inch) Test: Wind your yarn around a standard ruler or needle gauge for 1 inch. Count the individual strands. Do not wrap too tight (compresses yarn) or too loose (leaves gaps) to obtain an accurate yardage measurement.
Category 4: Medium
Worsted, Afghan, Aran
9-11 wraps
16-20 sts
11-14 double crochet
4.5 - 5.5 mm (US 7 to 9)
5.5 - 6.5 mm (US I-9 to K-10.5)
Explore Additional Utilities
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Calculate water and liquid concentrate volumes for multi-part hydroponic reservoirs to achieve target mixing ratios and EC.
Salinity — PSU ↔ g/kg ↔ % — seawater concentration
Convert between Practical Salinity Units (PSU), salinity concentration in g/kg (ppt ‰), and percentage (%).
Mortality Rate & Life Expectancy
Explore actuarial cohort metrics, Gompertz-Makeham mortality rates, survival probabilities, and remaining life expectancy by age.
Body Mass Index (BMI) & Waist
Calculate Body Mass Index (BMI) and Waist-to-Height ratios to assess body composition.
Weight Converter
Convert between kilogram, gram, pound, ounce, stone, and other mass units.
Roman Numeral Converter
Convert between classical Roman numerals (XIV, MCMLXX) and decimal integers dynamically.
Length Converter
Convert between meter, kilometer, centimeter, mile, yard, foot, inch, and more.
Chemical Solutions Concentration
Convert chemical solutions concentration (Molarity ↔ Molality ↔ PPM) and analyze mass ratios.
QR Code Generator
Instantly render plain text streams or URLs into scalable vector QR patterns complete with sizing triggers.
Currency Converter
Convert global currencies using simulated or fetched live rates (USD, EUR, GBP, JPY, etc.).
Pallet Configuration (Boxes/Pallet)
Optimize pallet loading layouts by calculating maximum box stacking of specified dimensions onto standard pallet sizes.
Dovetail angle — ratio ↔ degrees for hardwood vs softwood
Convert dovetail joint slope ratios (e.g. 1:6, 1:8) to slope angles in degrees and verify hardwood/softwood suitability.
Concrete Mix Ratio Calculator
Calculate volume ratios, cement bags, sand, gravel, and water quantities for standard concrete grades.
Fabric & Thread Density Calibrator
Analyze fabric weights, compare cotton single-ply thread counts, and calculate textile density.
Carbonation volumes ↔ CO2 pressure ↔ temperature
Compute carbonation volumes of CO2 or determine draft regulator PSI settings based on storage temperature.
Handicap index ↔ course handicap — golf scoring
Translate USGA/R&A Handicap Index to Course Handicap with slope rating and course rating adjustments.
Fold ratio — paper thickness ↔ maximum folds possible
Compute theoretical limit of fold iterations possible for paper size and thickness (Britney Gallivan equation).
U-value ↔ thermal performance — double vs triple glazing
Analyze thermal conductivity (U-values and R-values) for energy-efficient glazing window performance.
Species-Specific Drug Dosing
Calculate animal weight-based dosages, target mg requirements, and liquid volumes across different species: dogs, cats, horses, cattle, and rabbits.
Tablet Splitting & Cost Calculator
Calculate tablet splitting doses, available whole/half combinations, cost savings, and review critical pill splitting safety guidelines.