Soil pH & Amendment Calculator
Calculate the required lime or sulfur applications needed to correct soil acidity/alkalinity for plant growth.
* Always divide massive adjustments into split applications over several weeks to avoid chemical shock.
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.
USCS Soil Classification Solver
Classify soil type under the Unified Soil Classification System (USCS) using sieve analysis and Atterberg limits.
Crown position ↔ function — hand setting vs winding
Map out the mechanical state and winding functions of crowns at positions 0, 1, and 2, including quickset dates and hacking.
Pediatric Dosing Calculator
Estimate pediatric dosages from adult recommendations using standard pediatric clinical rules: Clark's, Young's, Webster's, Fried's, and BSA methods.
Reserve deployment altitude — height ↔ opening time
Evaluate deployment altitude, reserve opening time, and descend safety duration.
Species-Specific Drug Dosing
Calculate animal weight-based dosages, target mg requirements, and liquid volumes across different species: dogs, cats, horses, cattle, and rabbits.
Octave Band Converter
Calculate center frequencies, upper/lower band limits, and bandwidths for fractional octave bands (1/1, 1/3 octaves).
Bearing ↔ azimuth ↔ compass direction — navigation angles
Convert between 360-degree azimuths, quadrant compass bearings (e.g., N45°E), and cardinal directions for mapping and surveying.
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.
Head Pressure Converter
Convert between hydrostatic head pressure (meters or feet of water) and fluid pressures like bar, PSI, Pascals, and atmospheres.
Water Footprint & Virtual Water Calculator
Estimate virtual water consumption based on diet choices, household activities, and direct/indirect product footprints.
Pipe Flow Rate Calculator
Calculate water flow rate, velocity, and capacity under gravity or pressurized nozzle flow.
Fabric Width Yardage Converter
Convert fabric yardage requirements between different standard widths like 44 inches and 60 inches.
Roving weight ↔ finished yarn yardage estimate
Calculate expected yarn yardage from roving mass based on target spinning grist (yards per pound or run).
Cabochon dome height ↔ base diameter ratio
Calculate cabochon dome proportions, bezel edge thickness, and curvature radii based on base shapes.
Tank pressure ↔ volume ↔ dive time — SAC rate
Calculate Surface Air Consumption (SAC) rate, gas consumption, and remaining dive time based on cylinder volume and depth.
Stocking density — fish size ↔ liters per kg
Calculate stocking density (kg/m³ or L/kg), total biomass, and maximum safe fish count based on tank volume and average fish weight.
Lap speed — RPM ↔ surface speed at given diameter
Calculate lap disk surface feet per minute (SFPM) speeds to optimize pre-forming, grinding, and polishing.
Swimming Pace & Yardage Converter
Convert swim splits and paces between per-100m, per-100 yards, and overall distances with custom pool sizes.
Gray ↔ rad (Absorbed Dose)
Convert between Gray (Gy), rad, milligray (mGy), and microrad (µrad) to analyze absorbed ionizing radiation energy per unit mass.