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What is Order Of Magnitude?

 , January 13, 2016
Order of magnitude is a rough measurement technique that considers things in powers of ten. Anything less than a power of ten is rounded down for the purposes of comparison. For example, revenue of $1 million and $4 million would be considered the same order of magnitude. Revenue of $60 million dollars is one order of magnitude more than $1 million. A way of thinking about order of magnitude is that it only considers how many zeros a number has in it. Any two numbers that have the same number of zeros are the same order of magnitude.
Examples: Order of Magnitude
startendorder of magnitude
190
10991
1009992
100099993
10,00099,9994
100,000999,9995
1,000,0009,999,9996
10,000,00099,999,9997
100,000,000999,999,9998
1,000,000,0009,999,999,9999
Overview: Order Of Magnitude
TypeComputational Mathematics
DefinitionAn approximation technique that reduces numbers to their powers of 10.
ValueMaking approximations of big numbers where precision is meaningless or exact values are unknown.
Assigning numbers to general categories for the purposes of comparison.
Often used to compare the speed of algorithms and estimate the complexity of problems in science, particularly computer science.
ExamplesAn economy car costs two orders of magnitude more than a bicycle.
Interstellar space travel is many orders of magnitude more complex and costly than landing on the moon.
Related ConceptsAlgorithms

Project Management

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Acceptance Criteria
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Agile
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Baseline
Basis Of Estimate
Behavioral Requirements
Change Control
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Cost Overrun
Cost Variance
Defect Density
Deliverable
Document Control
Earned Value
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Estimate At Completion
Estimate To Complete
Estimates
Feasibility Analysis
Fudge Factor
Full-Time Equivalent
Human Factors
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Out Of Scope
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Project Artifacts
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Project Management
Project Metrics
Project Planning
Project Politics
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Project Proposal
Project Risk
Regression Testing
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Return On Investment
RFP
Risk Register
Schedule Baseline
Schedule Chicken
Scope
Scope Baseline
Scope Creep
Scrum
Set Up To Fail
Specifications
Sponsor
Stakeholder
Stakeholder Management
Statement Of Work
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Subproject
Use Case
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Workaround
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Secondary Risk

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Risk Register

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Risk Perception

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Implementation

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Project Risk Management

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