Time Zones & Calendar Suite
High-precision astronomical, religious, business, and standardization calendar converters.
ISO 8601 Week Number Calculator
ISO 8601 is the global standard for representing dates and times. It defines week 01 of any year as the week containing the first Thursday of that year, ensuring consistent week indices across business, logistics, and planning.
Dynamic Conversion Output
Calendar Insights
- • **ISO 8601** prevents "split weeks" at the start of a year. Week 01 always has a minimum of 4 days in the new calendar year.
- • **First day**: The ISO week starts strictly on **Monday** and ends on **Sunday**.
Explore Additional Utilities
Pallet Configuration (Boxes/Pallet)
Optimize pallet loading layouts by calculating maximum box stacking of specified dimensions onto standard pallet sizes.
Pregnancy Due Date & Milestones
Calculate estimated due date (EDD), gestational age, fetal development sizes, and trimester milestones.
Reading & Speaking Timer
Convert total word counts to estimated reading or speaking time at standard speeds.
BPM ↔ Milliseconds Calibrator
Convert beats per minute (BPM) to millisecond delay values and frequency hertz.
Base64 Encoder
Encode textual strings to Base64 format, or decode Base64 back to raw text.
Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law and Joules Law formulas.
Roof Pitch Calculator
Convert between roof pitch ratios, degrees, and percentages, and calculate rafter lengths.
Fuel Efficiency Converter
Convert between miles per gallon (mpg), liters per 100km (L/105km), and km/liter conversions.
Currency Converter
Convert global currencies using simulated or fetched live rates (USD, EUR, GBP, JPY, etc.).
Flight Altitude Calibrator
Convert cruise altitudes between feet, meters, and flight levels, and estimate standard air temperature and oxygen rules.
Water Depth & Pressure Converter
Convert ocean depth between fathoms, meters, and feet, and estimate hydrostatic pressure and bathymetric marine zones.
Tidal Rule of Twelfths Calculator
Estimate hourly tide heights and flow volumes between high and low tide periods using the standard maritime rule.
Engine displacement — cc ↔ cubic inches ↔ liters
Convert and calculate total engine volume in cc, cubic inches, and liters using cylinder bore, piston stroke, and cylinder count.
Engine power ↔ hull speed — planing vs displacement
Estimate maximum displacement hull speeds (LWL formula) or calculate planing hull speeds using Crouch's classic marine formula.
Preheat temperature — steel grade + thickness → °C
Estimate preheat temperatures using Carbon Equivalent (CE) chemistry formulas and plate thickness guidelines to prevent hydrogen cracking.
Time Zone Converter
Compare and convert times between universal time zones with ease.
Pipe nominal size ↔ actual OD — NPS vs DN standards
Cross-reference standard Nominal Pipe Sizes (NPS) with Diameter Nominal (DN), wall thickness, and outer diameter measurements.
Board feet ↔ cubic meters ↔ cubic feet — lumber volume
Convert lumber volume measurements between Board Feet, Cubic Feet, and Cubic Meters.
Carton CBM ↔ Container Capacity
Convert carton dimensions to Cubic Meters (CBM) and calculate carton capacity for 20ft and 40ft shipping containers.
Current Speed Converter
Convert tidal, ocean, and river current speeds between knots, meters per second (m/s), and kilometers per hour (km/h).