Calculators, Converters and Other Tools
West Egg Inflation Calculator
Calculate increases in prices over the years.
Math for Journalists App
Download this free iOS app for quick reference.
Martindales’ Reference Desk: Online Calculators
Links to dozens of types of online calculators.
Zillow: Mortgage Calculator
Combines comprehensive outputs, showing a mortgage payment in full, with a smooth interface and attractive usability.
Using a simple and clean interface, this site lets you calculate percentages three ways: – What is x% of a number? – x is what % of y? – What is the % change between x and y?
“Interactive calculators for many measurement systems both commonly used like metric and U.S. Avoirdupois and quite exotic like Ancient Greek and Roman.”
Financial Aid Interest Calculator
Determine compounded daily interest.
BankRate: Interest Calculator
Track the difference a small percentage change in interest can make on an investment over time.
Use this iPhone app to point at a written or typed math problem and it will scan and solve it using AI software.
Determine distances, flight times, etc. You also can do this by typing into Google the flight time/distance, etc.
Databases, Research and Reference
Rankings and statistics on hundreds of topics and countries. The world’s cleanest country, the country with the most mobile phones per capita, etc.
Robert Niles: Statistics Writers Should Know
An excellent reference primer from Robert Niles on stats for journalists.Start here with several math tutorials!
National Center for Business Journalism: Newsroom Math Crib Sheet
Great math shortcuts and formulas from Steve Doig.
Research Statistical Terms Primer for Journalists
Great primer from Harvard.
John Allen Paulos: Mathematics
John Allen Paulos is a great source for math for journalists. He is a Professor of Mathematics at Temple and is a regular columnist on ABCNews.com.
Common errors by reporters, advertisers, politicians and activists.
American Math Society: What’s New in Mathematics
Includes a ‘Feature Column’ monthly essays on mathematical topics), ‘Math in the Media’ (highlights of math news from science literature and the current media), ‘Math Digest’ (summaries of articles on mathematics), and the ‘AMS Public Awareness Office'(press releases, contacts for journalists, and more).
Explores how journalists can use statistics.
More than 1,000 pre-solved problems, many with free answers, for geometry, trig, algebra, etc. A very handy site for journalists.
Pew Research Center: The Daily Number
Daily stat “that highlights an important finding or trend.”
Bureau of Labor Statistics: Consumer Price Index Database
Select an item (gas, food, etc.) and track price increases nationally over time. Great quick reference for stories.
History of Mathematics Archive
Searchable, and browsable by topics.
Encyclopedia of Mathematics
More than 8,000 entries.
Fun with Math
A great site for analyzing numbers and coming up with odd facts and figures for stories. It’s great for comparing sizes, weights and gives the reader some perspective.
The Original Tipping Page
Lists acceptable amounts for specific situations.
How many seconds do you have left?
Mathematics of Tsunamis
The math and physics rules that govern them.
We wanted to share a good example of how to put some large numbers or obscure measurements into context that the average reader can relate to:
Q. Is there some way to put 488 acres into context, i.e., what is that as big as?
A. One acre is equivalent to 43,560 sq. feet or 4,840 sq. yards. One football field is equivalent to 57,240 Sq. feet. So one acre is 76% the size of a football field. In the Midwest, farms were homesteaded and also sold by the railroads in quarter sections. A section is 640 acres. A section is also one square mile. A quarter section is 160 acres. Three quarter sections add up to 480 acres. Where I am from in Iowa the farmers often talk in terms of how many farms a person has. If the farm was 488 acres the farmer would call that three farms or 3/4 of a section. Or just 488 acres.