General Reference
Reference Materials
Online 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

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

Series of online engineering calculators and support materials

Convert a gas from one unit of measure to another

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

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

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