Science

Enables you to convert between nine units of acceleration.
http://www.microimg.com/science/acceleration.html

Convert to and from various angle units. [New URL]
http://www.truetechcontrols.com/Calculators/cal_anglefinal.htm

Convert to and from various units. [New URL]
http://www.calculator.org/properties/angular_acceleration.prop

Convert to and from various units. [New URL]
http://www.calculator.org/properties/angular_velocity.prop

Convert area measures from one square unit to another.
http://www.microimg.com/science/area_equiv.html

The Astronomy Calculator aspires to provide general information about the phases of the moon, planets and next annual meteor showers. You supply the date, time of observation, and the number of hours east and west from directly overhead.
http://w3.one.net/~rback/frames.html

Calculate the molecular weight, the extinction coefficient, the concentration, and the melting temperature of a single stranded nucleic acid. Additionally, you can enter a protein sequence and calculate the molecular weight (using average isotopic mass), extinction coefficient, the concentration, and the formal charge. For both sets, either nucleotide or amino acid composition and percentages are calculated.
http://paris.chem.yale.edu/extinct.html

Converts body height and body weight from English to metric units or from metric to English units.
http://www.geocities.com/bodyconverter/

A form which allows you to calculate an adult's Body Surface Area (BSA), based on height and weight.
http://www.ultradrive.com/bsac.htm

Convert to and from various units. [New URL]
http://www.calculator.org/properties/capacitance.prop

Convert between metric, U.S. liquid and dry measures, British Imperial liquid and dry measures, Old Russian liquid and dry measures, and cooking measures. Just enter the amount you know and then click in any other box to see all the conversions.
http://chipdoc.com/Converters/capacity.html

Enter either the circumference, radian, degree, grade or nautical rhumb to find the other four.
http://www.convert-me.com/en/convert/circular

Computes the standard relations for compressible flow of a perfect gas.
http://www.aoe.vt.edu/aoe3114/calc.html

Converts between bits, bytes, megabytes and seven other computer data storage units.
http://www.convert-me.com/en/convert/computer

Use this page to convert to and from U.S. fluid to metric measures and U.S. dry to metric measures.
http://hbd.org/brewery/cm3/recs/convert.html

Convert to and from over 500 different units.
http://www.chemie.fu-berlin.de/chemistry/general/units_en.html

Convert weight between grams, carats, pennyweights, ounces. [New URL]
http://www.dendritics.com/scales/units-f.htm

This calculator shows you how much the air conditions on any given day will alter the density of the air. Enter the altitude, temperature, altimeter setting and humidity, then click the calculate button. [New URL]
http://rshelq.home.sprynet.com/calc_da_rh.htm

This site gives you nine choices of units of energy/work to convert to and from.
http://www.microimg.com/science/energy-work_equiv.html

Convert between seven units of force.
http://www.truetechcontrols.com/Calculators/cal_forcefinal.htm

Apples and oranges.
http://www.sciencemadesimple.net/fruit.html

A trio of calculators to help you determine the circumference and radius of a circle, the surface area and volume of a cone, and the surface area and volume of a sphere.
http://www.dropbears.com/u/utilities/geometric.htm

Learn about vectors and vector operations by sketching and playing with them.
http://www.frontiernet.net/~imaging/vector_calculator.html

This calculator will take your air temperature and relative humidity and calculate the heat index.
http://www.srh.noaa.gov/elp/wxcalc/heatindex.html

Solve for pressure, volume, moles or temperature.
http://www-tech.mit.edu/Chemicool/idealgas.html

Convert between seven units of illuminance. [New URL]
http://www.calculator.org/properties/illuminance.prop

Convert between seven units of inductance.[New URL]
http://www.calculator.org/properties/inductance.prop

A set of programs and specialized tables of mathematical constants dedicated to the identification of real numbers. It also serves as a way to produce identities with functions and real numbers.
http://www.cecm.sfu.ca/projects/ISC/

Give Jehosaphat a simple math problem to solve and she'll jump the answer!
http://www.dodds1.com/Java/Jj.html

Convert lengths between twenty-five different units of measurement. [New URL]
http://www.wforum.com/online/length.htm

Convert between five different luminance units of measure. [New URL]
http://www.calculator.org/properties/luminance.prop

Convert between three different units of magnetic flux. [New URL]
http://www.calculator.org/properties/magnetic_flux.prop

Convert between forty-seven different units of measurement. [New URL]
http://www.calculator.org/properties/mass.prop

More than forty calculators in one, with links to dozens more.
http://www.megaconverter.com/mega2/

World Wide Metric presents four calculators to convert to and from metric: length, weight, pressure and volume.
http://www.worldwidemetric.com/metcal.htm

Convert to and from eight units of metrology.
http://www.microimg.com/science/metrology_equiv.html

Helps you figure out percentages easily.
http://www.onlineconversion.com/percentcalc.htm

Convert to and from eight units of power. [New URL]
http://www.zephyr.org/power.html

Easily determine if a number is prime or not.
http://www.onlineconversion.com/prime.htm

Convert to and from twenty units of pressure. [New URL]
http://www.truetechcontrols.com/Calculators/cal_pressfinal.htm

Convert to and from three units of specific heat. [New URL]
http://www.scinet.cc/convert6.html

Convert between nine different measurements of speed.
http://www.text-trieve.com/products/references/speedconv.htm

Convert a temperature to and from Celsius, Fahrenheit, Réamur, Kelvin and
rankine.
http://www.cchem.berkeley.edu/ChemResources/temperature.html

Convert to and from nine units of thermal conductivity. [New URL]
http://www.calculator.org/properties/thermal_conductivity.prop

Convert to and from fourteen units of time. [New URL]
http://www.onlineconversion.com/time.htm

Convert to and from five units of torque. [New URL]
http://www.onlineconversion.com/torque.htm

Convert between eight different units.
http://www.microimg.com/science/USfluid_equiv.html

Convert to and from twenty-nine units of velocity. [New URL]
http://www.calculator.org/properties/velocity.prop

Convert to and from nine units of voltage. [New URL]
http://www.calculator.org/properties/voltage_emf.prop

Convert to and from seventy-six units of volume. [New URL]
http://www.calculator.org/properties/volume.prop

The El Paso National Weather Service Office's weather calculator features temperature, moisture, pressure and wind unit conversions for 16 different weather-related variables.
http://www.srh.noaa.gov/elp/wxcalc/wxcalc.html

More than a dozen weather-related calculators, including temperature, wind chill, heat index, snow density, sea level pressure, air density and geostrophic wind.
http://members.aol.com/brianwp18/wxpage/wxcalcs.html

This is a site with calculators that will help you solve a huge variety of math problems from everyday simple problems (figuring a tip; the sale price of an item) to word problems, converting fractions to decimals, as well as help with trigonomy and calculus problems. [New URL]
http://school.discovery.com/homeworkhelp/webmath/

Convert between twenty units of weight.
http://www.onlineconversion.com/weight.htm

Fill in the temperature and wind speed, then click Calculate. [New URL]
http://leav-www.army.mil/weather/Windchil.htm

This calculator shows the shelter effect (wind shade) of blunt obstacles (buildings, trees) in any 30 degree sector near a wind turbine.
http://www.windpower.dk/tour/wres/shelter/