- Christer's Index and Glossary
Defines hundreds of math terms. - English-Spanish Math Dictionary
English math terms listed with their Spanish equivalents. - How Many?
"A Dictionary of Units of Measurement." - Math Reference
"A mathematics reference for students and teachers." - Math Reference Project
"An electronic archive of mathematical information. Topics range from high school geometry up to graduate level topology, and (almost) everything in between." - MathWorld
"MathWorld is a comprehensive and interactive mathematics encyclopedia intended for students, educators, math enthusiasts, and researchers." - Online Mathematics Textbooks
Links to free online math books, mostly for college-level and above.
Tables
- Math2.org
Math reference tables, including algebra, geometry, trig, calculus, conversion tables, etc. Also includes links to other math sites. - Math.com: Formulas and Tables
The same information as Math2.org arranged in a different style. - SOS Mathematics Tables and Formulas
"This site is a place for students and educators to quickly access mathematical formulas. The tables will be organized by topics."
Calculators
- Astro-Physical Calculator
Online javascript calculator with various physical constants (speed of light, Avagadro Number, etc.) pre-programmed in. - Calculator.com
Standard, scientific, graphic, mortgage, currency, and other calculators. - Google Calculator
"To use Google's built-in calculator function, simply enter the expression you'd like evaluated in the search box and hit the Enter key or click the Google Search button." - Martindale's Calculators On-Line Center
A vast number of mathematical online calculators are gathered together at this site. - Online Conversion
"Convert just about anything to anything else. Over 5,000 units, and 50,000 conversions."
Graphs
- Create a Graph
Easy to use tool for making graphs and charts. - e-Tutor Graphing Calculator
Free online graphing calculator. (Only does graphs, not other functions of graphing calculators.) - Excel : Graphing Lessons
-- Creeating a Chart or Graph
-- Excel Graphing Tutorial
-- Graphing in Excel - Kids' Zone: Create a Graph
Online tool. - Swivel: Graphs
View others' graphs or create your own.