Can’t remember how to write the Roman numeral for 10,000? Need to figure square yards but don’t remember the formula? That’s the case with many of us – we learned the subjects once but may have forgotten much of it. In cases like that, you need a quick-reference. Here are some great pages that can help you on your way:

There’s a wealth of instant info at www.onlineconversion.com Length, speed, temperature, acceleration, angles, currency, dates, times, density, energy, flow rates, length or distances, and light are just some of the conversion charts they feature. You’ll never have any more trouble with math problems after you bookmark this site.

Go to www.convert-me.com/en to get charts for capacity and volume, speed, temperature, time, pressure, fuel consumption, torque, and many others. The site is easy to navigate and everything is listed in categories that makes it easy to find the subject in which you’re interested.

If you’re in a particular line of work you may find this site helpful. They have hard conversions for construction materials, mass conversion factors, pavement conversion factors, power conversions, pressure or stress conversion, reinforcing steel conversion and so much more. Check it out at www.wsdot.wa.gov/reference/metrics/factors.htm

Here’s another site where people in particular trades can find helpful info: www.fisherregulators.com/technical/tables. They have charts or volume rate equivalents, pressure equivalents, kinematic-viscosity conversion formulas, gas volume conversion, and other technical formulas.

If you cook a lot, www.that’smyhome.com/conversion.htm is a place you’ll want to bookmark. Use their recipe conversion tables for dry measures, wet measures, spoon measures and more.

Need to convert Celsius to Fahrenheit? Do it quickly at www.ncdc.noaa.gov/oa/climate/conversion/tempconvert.html

At www.iofm.net/community/kidscorner/maths/common_formulas.htm you can get many common formulas, along with decimal equations, metric weights, Roman numerals, and much more. It’s a great place to go to get help with math homework.

Volume conversion, metric linear measurements, metric weights, and even a cross reference for microns to mil thickness, are among the useful charts you’ll find at www.woodzone.com/measure/measure.htm

Interested in gardening? Convert gallons to pounds, inches to centimeters, or ounces to tablespoons with the useful charts at www.floridagardener.com/conversions.htm

If you’re still in school you may find the tables helpful at www.maths.soton.ac.uk/staff/Dewynne/mathtables.html There you’ll find multiplication tables, the zero powers of the first hundred natural numbers, first powers of the first hundred natural numbers, positive square roots, values of ‘sin’ for n=0 to 100. This is a very useful site for students and people who use these types of calculations at work.

Assorted mathematical tables: www.seminaire-sherbrooke.qc.ca/math/Pierre/Tables.pdf

Formulas, graphs, conversion tables, common units: www.knovel.com/knovel2/Toc.jsp?BookID=528

Mathematical and scientific tables: www.lib.monash.edu.au/ikiosk/math.html