Impulse Buy Lifetime Cost Calculator

See how much an impulse purchase really costs you over time.

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True Cost of Impulse Buying

Enter the purchase amount and see the real cost.

True cost over 10 years
$0
If invested: $0
Total spent on impulse
$0
If invested instead
$0
Opportunity cost
$0
Cost per impulse buy
$0
Monthly cost
$0
Daily cost
$0

Worked example

With the default inputs shown below, this calculator returns the following results:

InputValue
Impulse purchase amount ($)$500
How many times per year?12
Investment return if saved (%)8%
Time period (years)10
ResultValue
True cost over 10 years$31,473
Total spent on impulse$60,000
If invested instead$91,473
Opportunity cost+$31,473
Cost per impulse buy$500
Monthly cost$500/mo

Values shown are produced by this page in your browser; change any input to update them.

How to use the True Cost of Impulse Buying

  1. Impulse purchase amount ($) — default $500
  2. How many times per year? — default 12
  3. Investment return if saved (%) — default 8%
  4. Time period (years) — default 10
  5. Press Calculate to update the results instantly.

Frequently asked questions

Add up the spend and then the return it could have earned. $40 a month invested at 7% for 20 years grows to about $20,800.
The value of what you gave up. For an impulse purchase it is the future value that money would have reached if invested instead.
Use a 48-hour rule on anything over a set amount, remove saved card details from shops, and keep a wish list so the urge has somewhere to go.

Sources & references