Highlights

Converts between °C, °F, and K

Metric ↔ imperial, including feet and inches

kg, lbs, oz, stone, and more

km/h, mph, m/s, knots

Square feet, metres, acres, hectares

Litres, gallons, cups, fl oz, pints, and more

Converts between L/100km and MPG

SI and IEC units, plus transfer rates

Watts, kilowatts, amps — P=VI calculator included

Converts 100+ currencies using live rates

BTC, ETH, and more — live price lookup with sparkline graphs

Recognizes dates in any format, relative (next Friday) or absolute

Converts times across 70+ timezone abbreviations

Converts epoch seconds to human-readable date

Shows the next occurrence date for major holidays worldwide

Shows local time and calling hours for 260+ major cities

Identifies area code location — NANP, UK, AU, NZ, Israel

Private/special ranges identified locally; public IPs look up the registered owner (org, ASN)

Shows network address, broadcast, and usable host range

Links to the NVD vulnerability database entry

Links to the MITRE Common Weakness Enumeration

Links directly to the RFC Editor

Links to the research paper at doi.org

Medical diagnosis code lookup

Shows a color swatch, RGB, HSL, and nearest CSS name

Any CSS color format — includes WCAG contrast ratios

See scores, schedules, and standings for NHL, NBA, NFL, MLB, and Premier League

Converts between American, decimal, and fractional odds — plus implied probability

100+ book name variants — Torah, Wisdom books, NT, and Deuterocanonical

All 37 tractates with variant spellings

All 63 tractates

Weekly Torah portion — shows verse range

All 14 books of the Rambam

All 114 surahs by number or transliterated name

Seven major hadith collections

Catholic Catechism paragraph lookup

Revised Common Lectionary readings for the current week