General Reference
Reference
Calculators

Convert sq. meters, sq. inches, sq. feet, sq. yards, sq. rods, sq. chains, roods, acres, sq. miles

Online calculator determine's baby's approximate due date

Calculate BAC percentage based on type of drinks consumed, percent alcohol, weight & hours consuming

Links to hundreds of online calculators

Enter month and year to obtain that month's calendar

Creates one month or one year calendars

Converts a number into Chinese or shows the value of a Chinese number

Concrete calculators, aggregate calculator, road materials calculators and more

Useful calculators for construction professionals

CODATA-recommended values of fundamental physical restraints

Provides conversion formulas for acres, BTU, liquid measurements, temperature, etc.

Voltage drop, Ohm's Law, motor data calculators and more

Convert joules, kg-meters, ft-lbs, kw-hrs, btu, liter-atm, k-cal, metric hp-hrs, US hp-hrs

A series of online calculators of interest to engineers

Series of engineering calculators

Select the year for which you would like a complete listing of Federal holidays for that year

Series of online engineering calculators and support materials

Convert a gas from one unit of measure to another

Obtain the GMT plus current time in USA, Canda, Europe, Major Markets of the World

Handy project calculators - tells you how many sq ft of flooring to purchase, etc.

To determine kW required to raise the temperature of any Liquid

Computes the additional life expectancy depending on gender and current age

Time zones of the world

Obtain the circumstances of recent and upcoming lunar eclipses for any location

Convert kilograms, grains, troy ounces & pounds, short &, long tons, metric tons, avoirdupois ounces

Metric conversion table & chart and online converter

Conversion equivalents - explanation, but no online calculator

Calculators convert weights, measures and units conversion/calculation modules

Convert megadynes, kg/sq cm, lb/sq in, atomospheres, Hg meters & inches, H20 meters, feett, inches

Provides the conversion relationship between US customary units and SI International System units

Receive sun and moon data for a single day by providing the date and location

Calculates the times of sunrise and sunset for that specific location, on that specified date

Enter the city to obtain its current time

Convert minims, drams, ounces, gills, pints, quarts, gallons, barrels

Online metric converter

Convert cm/sec, m/sec, m/min, km/hr, ft/sec, ft/min, mi/hr, knots

Official US time

Displays the current time and date for different time zones around the world

Time Zone Maps with current time