Equatorial & Alt-Az Coordinates Converter
Convert Right Ascension to Hour Angle and compute real-time Altitude & Azimuth positions.
Hour Angle (HA) = LST − RA. Altitude is computed via spherical trigonometry: sin(Alt) = sin(Dec)sin(Lat) + cos(Dec)cos(Lat)cos(HA). Compass direction is then derived using spherical azimuth conversions.
Explore Additional Utilities
Horse Height (Hands ↔ cm ↔ inches)
Convert equestrian height from traditional hands (hh, where 1 hand = 4 inches) to centimeters and inches, with pony/horse classification.
Tolerance converter (ISO fit classes ↔ clearance)
Find upper and lower deviation limits for shaft and hole ISO 286 fit classes like H7, g6, f7, and compute clearances in microns or mm.
Soil Bearing Capacity Converter
Convert soil bearing capacities between Kilopascals (kPa), Tons per Square Foot (tsf), Pounds per Square Foot (psf), and kg/cm² with typical soil range guides.
Draw weight — lbs ↔ kg — bow poundage
Convert between Pounds (lbs) and Kilograms (kg) draw weights. View recommended setups for various target types.
Sound Pressure Level (SPL) Converter
Convert sound pressure from Pascals (Pa) to decibels (dB SPL) and calculate distance attenuation or sound level summing.
Hallmark converter (UK date letters ↔ year)
Decode historic and modern UK silver, gold, and platinum hallmarks, converting assay office date letters to exact production years.
US Inflation Adjuster
Evaluate historical purchasing power changes in the United States using official CPI records.
Pace, Speed & Time Converter
Convert between different running paces and speeds (min/km, min/mile, km/h, mph) and predict race times.
Ammonia toxicity — total ammonia ↔ pH ↔ toxic fraction
Calculate the highly toxic un-ionized ammonia (NH3) fraction from Total Ammonia Nitrogen (TAN), pH, and water temperature.
Dog Age ↔ Human Age Equivalent
Calculate the human age equivalent of a dog based on their age and breed size category (small, medium, large, or giant), using modern veterinary curves.
Ink coverage — % coverage ↔ grams per sq meter
Estimate wet/dry printing ink consumption and layer weight based on sheet area and CMYK channel coverage percentages.
Time Zone Converter
Compare and convert times between universal time zones with ease.
Honey yield — hive strength ↔ kg per season estimate
Estimate seasonal honey surplus production based on hive workforce size and local floral nectar flow conditions.
Asset Depreciation & Insured Value
Calculate asset depreciation over time based on age, condition, actual cash value (ACV), and salvage values for insurance coverage.
Saponification value — oil type ↔ lye required per gram
Look up sap values for standard oils and calculate custom lye weights.
Species-Specific Drug Dosing
Calculate animal weight-based dosages, target mg requirements, and liquid volumes across different species: dogs, cats, horses, cattle, and rabbits.
Preheat temperature — steel grade + thickness → °C
Estimate preheat temperatures using Carbon Equivalent (CE) chemistry formulas and plate thickness guidelines to prevent hydrogen cracking.
Carton CBM ↔ Container Capacity
Convert carton dimensions to Cubic Meters (CBM) and calculate carton capacity for 20ft and 40ft shipping containers.
Weight Converter
Convert between kilogram, gram, pound, ounce, stone, and other mass units.
Dimensional Weight ↔ Chargeable Weight
Calculate shipping dimensional weight based on L x W x H using standard carrier factors, and determine final chargeable weight.