
Rule Of Thumb
A rule of thumb is a heuristic guideline that provides simplified advice or some basic rule-set regarding a particular subject or course of action. Here is the calculation that Investopedia uses to determine your net worth: If you are employed and earning income: ((your age) x (annual household income)) / 10. If you are not earning income or you are a student: ((your age – 27) x (annual household income)) / 10. There are several well-known financial rules of thumb that provide guidance for investors, including the following guidelines: A home purchase should cost less than an amount equal to two and a half years of your annual income. As another example, buying life insurance based on a multiple of income does not account for the specific needs of the surviving family, which include a mortgage, the need for college funding and an extended survivor income for a non-working spouse. Rules of thumb do not account for specific circumstances or factors occurring at a particular time, or that could change over time, which should be considered for making sound financial decisions.

What is a Rule Of Thumb?
A rule of thumb is a heuristic guideline that provides simplified advice or some basic rule-set regarding a particular subject or course of action. It is a general principle that gives practical instructions for accomplishing or approaching a certain task. Typically, rules of thumb develop as a result of practice and experience rather than through scientific research or a theoretical foundation.



Understanding Rules Of Thumb
Investors may be familiar with a variety of "financial rules of thumb" that are intended to help individuals learn, remember and apply financial guidelines. These rules of thumb address methods and procedures for saving, investing, purchasing a home and planning for retirement. Although a rule of thumb may be appropriate for a wide audience, it may not apply universally to every individual and unique set of circumstances.
The Rule of 72 is such a quick, useful formula that is popularly used to estimate the number of years required to double the invested money at a given annual rate of return. While calculators and spreadsheets have inbuilt functions to accurately calculate the precise time required to double the invested money, the Rule of 72 comes in handy for mental calculations to quickly gauge an approximate value.
Examples of Financial Rules of Thumb
There are several well-known financial rules of thumb that provide guidance for investors, including the following guidelines:
There are also rules of thumb for determining how much net worth you will need to retire comfortably at a normal retirement age. Here is the calculation that Investopedia uses to determine your net worth:
Take Rules of Thumb With a Grain of Salt
While rules of thumbs are useful to people as general guidelines, they may be too oversimplified in many situations, leading to underestimating or overestimating an individual’s needs. Rules of thumb do not account for specific circumstances or factors occurring at a particular time, or that could change over time, which should be considered for making sound financial decisions.
For example, in a tight job market, an emergency fund amounting to six months of household expenses does not consider the possibility of extended unemployment. As another example, buying life insurance based on a multiple of income does not account for the specific needs of the surviving family, which include a mortgage, the need for college funding and an extended survivor income for a non-working spouse.
Related terms:
Average Return
The average return is the simple mathematical average of a series of returns generated over a specified period of time. read more
Emergency Fund
An emergency fund is a source of ready cash in case of an unplanned expense, an illness, or the loss of a job. Now there’s new help to build one. read more
Four Percent Rule
The 4% Rule helps retirees determine how much money they should withdraw from retirement accounts each year. Read about the pros and cons of the 4% Rule. read more
Heuristics
Heuristics are a problem-solving method that uses shortcuts to produce good-enough solutions within a limited time. read more
Life Insurance Guide to Policies and Companies
Life insurance is a contract in which an insurer, in exchange for a premium, guarantees payment to an insured’s beneficiaries when the insured dies. read more
Mergers and Acquisitions (M&A)
Mergers and acquisitions (M&A) refers to the consolidation of companies or assets through various types of financial transactions. read more
Net Worth : Types & How to Calculate
Net worth is the value of the assets a person or corporation owns, minus the liabilities they owe. read more
Full Retirement Age (FRA)
The full retirement age is the age at which people can receive full retirement benefits upon leaving the workforce. read more
Personal Finance
Personal finance is all about managing your personal budget and how best to invest your money to realize your goals. read more