Woodworking & Carpentry Calculators
Interactive measurement conversions, precision joinery layouts, and material dimensioning tools optimized for cabinetmakers, builders, and hobbyist woodworkers.
Sandpaper Grit Standard Converter (CAMI ↔ FEPA ↔ Micron)
Convert and compare abrasive grit sizing systems. Map CAMI (US) to FEPA (P-grade) and absolute micron dimensions, with usage recommendations.
Select Sandpaper Grit
Equivalent Standards for Grit 80
Sanding raw wood in preparation for finishing, removing deep tool marks.
CAMI (Coated Abrasive Manufacturers Institute) is the traditional US standard. FEPA (Federation of European Producers of Abrasives) is the international standard, designated with a 'P' prefix.
For coarse grit they match closely, but fine grades diverge significantly (e.g., CAMI 400 has much larger particles than FEPA P800, which actually has a smaller micron size). Always look up absolute Micron ratings when doing high-grit polishing or fine grain sanding.
Explore Additional Utilities
Magnetic Declination
Estimate compass alignment values and offset angles between magnetic north and true north.
Sink rate — airspeed ↔ altitude loss per minute
Calculate glider sink rate in knots or m/s from airspeed and polar parameters, yielding altitude loss rate.
Yeast pitch rate — batch volume + gravity → grams of yeast
Determine required yeast cell counts and dry yeast weight based on batch volume, wort gravity, and target pitch rates.
BPM ↔ Milliseconds Calibrator
Convert beats per minute (BPM) to millisecond delay values and frequency hertz.
Flesch-Kincaid Reading Level
Calculate readability scores and Flesch-Kincaid school grade levels for any input text in real-time.
Tree diameter ↔ basal area — forestry measurement
Convert tree breast height diameters to single tree basal area or estimate stand basal area densities per acre or hectare.
U-value ↔ thermal performance — double vs triple glazing
Analyze thermal conductivity (U-values and R-values) for energy-efficient glazing window performance.
Visual Acuity Converter
Convert visual acuity measurements between Snellen US (20/20), Snellen Metric (6/6), decimal, LogMAR, and Percentage systems.
Thermal conductivity — W/m·K ↔ BTU·in/hr·ft²·°F
Translate thermal conductivity values between W/m·K, BTU·in/hr·ft²·°F, and other units.
CPU clock cycles ↔ instructions per second
Translate CPU frequencies, core counts, and performance CPI/IPC values into Millions of Instructions Per Second (MIPS).
Spring rate — lb/in ↔ N/mm — suspension setup
Convert suspension coil spring stiffness between lb/in and N/mm. Estimate coil spring rates using wire diameter, coil diameter, and active counts.
Color Temperature Converter
Convert between color temperature in Kelvin and Mired units, with descriptive lighting labels and photographic application guides.
Clay shrinkage — wet size ↔ fired size
Calculate wet, bone-dry, and kiln-fired pottery dimensions and analyze total contraction rates.
Ore Grade & Concentration Converter
Convert mineral grade concentrations between grams per ton (g/t), weight percentage (%), troy ounces per ton (oz/st), and ppm.
Effect size — Cohen's d ↔ r ↔ odds ratio
Convert between various effect size measures like Cohen's d, Pearson correlation r, and Odds Ratio for scientific research interpretation.
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.
Drug Concentration Converter
Convert pharmaceutical concentrations between % w/v, mg/mL, and mol/L using substance molecular weight presets.
eGFR Kidney Function Calculator
Calculate Estimated Glomerular Filtration Rate (eGFR) using the modern CKD-EPI (2021) equation to evaluate kidney stages.
Planck units ↔ SI units — fundamental physics constants
Translate between SI physical units and the fundamental Planck natural units based on universal constants.
Sail area ↔ displacement ratio
Calculate Sail Area to Displacement Ratio (SADR) to evaluate a sailboat’s performance characteristics, speed potential, and light-wind capability.