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Marine species lookup in WoRMS - accepted name and status, authority, full classification, habitat flags, common names in many languages and other matches
Search the Catalogue of Life for accepted taxa - scientific name, authorship, rank, status, kingdom to genus classification and a link for each match
Drug and compound identifiers from MyChem - ChEMBL ID and max clinical phase, PubChem CID, formula, weight, IUPAC name, UNII and ChEBI ID
Convert a Gregorian date into the Islamic, Hebrew, Chinese, Persian, Indian, Buddhist, Japanese era, Coptic, Ethiopic and Minguo calendars with Julian day
Western and Orthodox Easter for any year from 1583 with Ash Wednesday, Palm Sunday, Good Friday, Ascension, Pentecost and Corpus Christi dates
Western zodiac sign with element, modality and ruling planet, Chinese zodiac animal and element, birthstone, generation and weekday for a birth date
ISO week number and label, day of year, days left, quarter for calendar and three fiscal years, leap year, Julian day and week start and end for a date
Count business days between two dates excluding weekends and optionally national public holidays for a country, with the next working day after the end
Black-Scholes-Merton price for European calls and puts with delta, gamma, vega, theta, rho, intrinsic and time value, moneyness and put-call parity check
Solve implied volatility from an observed option price using Black-Scholes, with delta, vega, a volatility regime label and the pricing error
Bond price from yield or yield to maturity from price with duration, modified duration, convexity, current yield and the price move for a one point yield change
Kelly criterion bet sizing from win probability and odds - full, half and quarter Kelly, expected log growth, break-even win rate and a verdict
Risk metrics from a price or return series - annualised return and volatility, Sharpe, Sortino, Calmar, max drawdown, 95 percent VaR, expected shortfall and skew
NPV, IRR, profitability index, payback and discounted payback for a cash-flow series with an accept or reject decision and NPV at several discount rates
Pregnancy due date by Naegele's rule from last period or conception with cycle adjustment, gestational age today, trimester and key milestone dates
Estimated blood alcohol concentration from weight, sex, drinks and hours using the Widmark formula, with sobering time and legal limit references
Estimated maximum heart rate by Tanaka, Fox or Gulati formula and five training zones in beats per minute, with Karvonen reserve zones when resting rate is given
Body fat percentage from tape measurements using the US Navy method with ACE category, healthy range and fat and lean mass when weight is supplied
Calories burned for 30 activities from MET values, body weight and minutes, with net calories above resting and similar-intensity activities
Decode 4, 5 and 6 band resistor colors into ohms, tolerance range and temperature coefficient, or encode an ohm value into the nearest E24 color bands
Solve volts, amps, ohms and watts from any two known values, with milliamps, kilohms and a recommended resistor wattage rating with a 2x margin
Encode a latitude and longitude into a geohash at any precision, or decode a geohash into its centre, bounding box, cell size and eight neighbouring cells
Convert coordinates to an Open Location Code plus code with the short-code hint, or decode a full plus code into its cell centre and size
Convert latitude and longitude to a UTM zone, latitude band, easting and northing with grid reference, or convert UTM coordinates back to WGS84
