Pace, Speed & Time Converter
Convert between min/km, min/mile, km/h, and mph running paces. Predict race times and view detailed mile/kilometer split charts.
Calculations utilize Pete Riegel's endurance prediction exponent (1.06). As distance increases, a runner's threshold speed drops naturally over extended durations due to systemic glycogen depletion and cardiovascular drift.
Explore Additional Utilities
Weld throat thickness ↔ leg length — fillet weld geometry
Convert between throat thickness and leg length for fillet welds. Estimate joint volume, weld weight, and shear load capacity.
Color Code Converter
Instantly convert between HEX, RGB, HSL, and CMYK color spaces with a visual real-time preview and slider inputs.
Roman Numeral Converter
Convert between classical Roman numerals (XIV, MCMLXX) and decimal integers dynamically.
NPK Fertilizer Blend Designer
Calculate exact commercial fertilizer weights (Nitrogen, Phosphate, Potash) required to hit crop nutrient targets.
Coordinates to UTM/MGRS
Convert standard Latitude & Longitude decimal coordinates to UTM and military grid reference (MGRS) systems.
Freeness — CSF ↔ SR — pulp drainage rate
Convert between Canadian Standard Freeness and Schopper-Riegler drainage scales. Identify target paper grades.
Freefall time — altitude ↔ seconds in freefall
Estimate freefall duration and terminal velocity based on exit altitude, deployment altitude, and body position.
Colony weight gain — nectar flow ↔ kg per day estimate
Estimate the daily hive weight gain from raw floral nectar inflow and final cured honey production.
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.
Nutrient dilution — concentrate ratio ↔ final EC
Calculate water and liquid concentrate volumes for multi-part hydroponic reservoirs to achieve target mixing ratios and EC.
Signature count — total pages ↔ sheets per signature
Divide book blocks into balanced signatures and calculate standard folded sheet configurations.
Ink viscosity — temperature ↔ consistency adjustment
Adjust oil-based printmaking inks for stiffness, tack, and temperature variations using modifiers and plate oils.
Etching time — acid strength ↔ plate depth ↔ minutes
Estimate intaglio plate etching durations in nitric acid or ferric chloride based on metal type and Baumé strength.
Grit progression — mesh size ↔ scratch depth
Convert abrasive mesh numbers to micron measurements to manage scratch depth progression.
Hide weight — animal size ↔ pickle solution volume
Determine required water volume, salt, and acid amounts for chemical pickling based on raw skin/hide weight.
Capacitor & Inductor Codes
Convert between capacitance and inductance units, and decode SMD/3-digit codes.
Coordinate converter — WGS84 ↔ local datum
Convert geographic coordinates between global WGS84 (GPS) and local datums, including UTM zone coordinate conversions.
URL Slug Generator
Generate clean, hyphenated, SEO-friendly slugs from any string with custom separators.
Facet angle ↔ critical angle — refractive index based
Calculate gemstone critical angles and recommended pavilion/crown alignments to maximize light reflection.
Adhesive ratio — PVA ↔ paste ↔ water formulation
Formulate custom bookbinding adhesive mixtures (polyvinyl acetate and wheat starch paste) for perfect open time and flexibility.