Time Zones & Calendar Suite
High-precision astronomical, religious, business, and standardization calendar converters.
Astronomical Julian Date Conversion
The Julian Date (JD) is the continuous count of days since the beginning of the Julian Period (January 1, 4713 BCE). Primarily used by astronomers, space scientists, and geodesists for variable date and orbital telemetry calculation.
Dynamic Conversion Output
Calendar Insights
- • **Modified Julian Date (MJD)** shifts the start of the day from noon to midnight, and subtracts 2,400,000.5 days to keep values smaller and more manageable for database processing.
- • **Precision**: 6-digit fractional decimal precision corresponds to roughly 0.086 seconds of time accuracy.
Explore Additional Utilities
Gelatin & Agar Agar Converter
Convert between gelatin sheets (platinum, gold, silver, bronze), powdered gelatin, and vegan agar agar.
Signature count — total pages ↔ sheets per signature
Divide book blocks into balanced signatures and calculate standard folded sheet configurations.
Beam divergence — mrad ↔ degrees ↔ spot size at distance
Calculate equivalent divergence angles and spot diameter at target plane from exit waist apertures.
Pregnancy Due Date & Milestones
Calculate estimated due date (EDD), gestational age, fetal development sizes, and trimester milestones.
Length Converter
Convert between meter, kilometer, centimeter, mile, yard, foot, inch, and more.
Data Storage Units
Convert digital storage capacity sizes across bits, Bytes, MB, GB, and Terabytes.
Roman Numeral Converter
Convert between classical Roman numerals (XIV, MCMLXX) and decimal integers dynamically.
Weight Converter
Convert between kilogram, gram, pound, ounce, stone, and other mass units.
ISO Week Number ↔ Calendar Date
Calculate ISO 8601 week numbers, week dates, and determine start/end weekdays of any given week year.
Paper Size Comparer
Convert standard paper formats (A4, Letter, Legal, A3) in mm/inches and visually compare overlap.
Clothing Size Converter
Convert apparel sizes (XS to 3XL) across US, UK, European, and Asian standards.
Time Zone Converter
Compare and convert times between universal time zones with ease.
Cable loss — frequency + length → signal attenuation
Estimate transmission line losses and remaining signal power for standard coaxial cables and optical fiber spans.
Unix Epoch Converter
Convert Unix epochs (seconds/milliseconds) to human-eye standard DateTimes, and transform local dates to Epoch times.
DPI / PPI Converter
Convert image pixel dimensions into physical print sizes (inches/cm) at any target resolution.
Dimensional Weight ↔ Chargeable Weight
Calculate shipping dimensional weight based on L x W x H using standard carrier factors, and determine final chargeable weight.
Animal Feed & Dry Matter Calculator
Convert animal body weight percentage dry matter intake (DMI) to daily feed requirements in kg/lbs, based on feed dry matter ratio and species presets.
Pipe Flow Rate Calculator
Calculate water flow rate, velocity, and capacity under gravity or pressurized nozzle flow.
Thread Weight Converter
Convert between different thread sizing standards including Tex, Denier, and Number English (Ne).
QR Code Generator
Instantly render plain text streams or URLs into scalable vector QR patterns complete with sizing triggers.