Wraps Per Inch (WPI)Spinning Guild
Convert WPI count to standard yarn weight categories, plies, and recommend needle/hook sizes.
Category Properties:
This yarn is traditionally equivalent to 8 ply yarn. The thickness makes it perfect for standard projects matching the needle recommendations above.
Explore Additional Utilities
Map scale — representative fraction ↔ bar scale
Convert map scale representative fractions (e.g., 1:24,000) to paper sizes, real-world distances, and graphical bar scales.
Stepper motor steps (degrees ↔ steps ↔ microsteps)
Convert between motor rotation angles in degrees, physical steps, and microsteps based on step angle and microstepping resolution.
Karat purity (Karat ↔ Fineness ↔ % gold)
Convert gold purity levels between Karat values, parts-per-thousand millesimal fineness, and pure gold percentage.
USCS Soil Classification Solver
Classify soil type under the Unified Soil Classification System (USCS) using sieve analysis and Atterberg limits.
Ballistic coefficient ↔ drag — projectile performance
Calculate bullet Sectional Density (SD) and Ballistic Coefficient (BC) using projectile weight, caliber, and form factor.
Safety glass thickness ↔ impact resistance rating
Calculate safety glass thickness requirements and impact resistance (Tempered vs. Laminated).
Honey yield — hive strength ↔ kg per season estimate
Estimate seasonal honey surplus production based on hive workforce size and local floral nectar flow conditions.
U-value ↔ thermal performance — double vs triple glazing
Analyze thermal conductivity (U-values and R-values) for energy-efficient glazing window performance.
Solar heat gain coefficient ↔ shading factor
Convert Solar Heat Gain Coefficient (SHGC) to Shading Coefficient (SC) for solar radiation control.
Water discount — full water ↔ reduced water ratio
Optimize water discount levels and water-to-lye concentration ratios to speed up soap curing.
Crease pattern scale — diagram size ↔ actual paper needed
Scale geometric origami crease patterns and tessellations to starting square sheet sizes.
Salinity for species — ppt ↔ specific gravity ↔ conductivity
Convert salinity values between ppt, Specific Gravity (SG), and Electrical Conductivity (mS/cm). Learn about species target zones.
Soil Plasticity Index Calculator
Calculate Plasticity Index (PI) from Liquid Limit (LL) and Plastic Limit (PL), and interpret soil state using the Atterberg limits chart.
Prism Power Converter
Convert ophthalmic prism power between prism diopters (PD) and degrees of deviation, with light bending estimations.
Elastic Stretch Ratio Calculator
Calculate the stretch percentage and relaxed vs. stretched lengths of elastics or stretch fabrics.
Denim Weight Converter
Convert denim fabric weight between ounces per square yard (oz/yd²) and grams per square meter (gsm) with fabric weight classifications.
Power reserve — mainspring tension ↔ hours of run time
Compute total mainspring operational run time based on turns of wind, barrel capacity, and balance wheel beat rate demands.
Heel angle ↔ righting moment
Calculate heel angle, righting arm (GZ), righting moment, and sailboat stability from displacement, vertical center of gravity, and wind force.
Soil Permeability Converter
Convert coefficient of permeability (hydraulic conductivity) between cm/s, m/day, ft/day, and m/s with soil type drainage classifications.
Dye concentration — wax weight ↔ color chips needed
Determine dry color chips or fluid dye drops needed based on total wax weight and target color depth.