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* Guesstimate* is an informal English portmanteau of

The word may be used in a pejorative sense if information for a better estimate is available but ignored.^{[7]}^{[8]}

Guesstimation techniques are used:

- in physics, where the use of guesstimation techniques to solve Fermi problems is taught as a useful skill to science students;
^{[9]} - in cosmology, where the Drake equation is a well-known guesstimation method;
^{[10]} - in economics, where economic forecasts and statistics are often based on guesstimates;
^{[11]}and - in software engineering, where new development of features and release timelines are based on effort guesstimates of tasks.

Lawrence Weinstein and John Adam's 2009 book *Guesstimation: Solving the World's Problems on the Back of a Cocktail Napkin*, based on the course "Physics on the Back of an Envelope" at Old Dominion University, promotes guesstimation techniques as a useful life skill. It includes many worked examples of guesstimation, including estimating the total number of miles that Americans drive in a year (about 2 trillion)^{[12]} and the amount of high-level nuclear waste that a 1 GW nuclear power plant produces in a year (about 60 tons).^{[13]}

Look up **guesstimate** in Wiktionary, the free dictionary.

**^***guess*Online Etymological Dictionary- ^
^{a}^{b}*guesstimate*Dictionary.com Unabridged (v 1.1) **^***guesstimate*Merriam-Webster On-line Dictionary**^***guesstimate*MSN Encarta Dictionary. Archived 2009-10-31.**^***guesstimate*Archived 2008-03-16 at the Wayback Machine American Heritage Dictionary**^**Compact Oxford English Dictionary guesstimate**^**"Guesstimate with confidence using confidence intervals" from back cover of Statistics for Dummies**^**Guesstimate; Grades 4-6 NTTI Lesson Plan**^**Guesstimation: Solving the World's Problems on the Back of a Cocktail Napkin, Tony Mann, Times Higher Education Supplement**^**The Drake Equation Archived 2009-09-26 at the Wayback Machine WeAreNotAlone.net**^**Economic outlooks often rely on guesstimation, M. Ray Perryman, San Antonio Business Journal**^**Weinstein & Adam (2008) Problem 5.1**^**Weinstein & Adam (2008) Problem 10.5

- Weinstein, Lawrence; Adam, John A. (2008).
*Guesstimation: Solving the World's Problems on the Back of a Cocktail Napkin*. Princeton University Press. ISBN 978-0-691-12949-5.

- The Fermi Project: Collection of guesstimates for practice Archived 2020-08-17 at the Wayback Machine