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Calcimator

Coin Bill Inventory Calculator

Calculate change fund requirements for vending machines based on transaction volume, cash payment rate, and collection frequency.

Inputs

$
%
%

Results

Total change fund needed

$1,965.60

≈ 15 pairs of sneakers

Change fund / machine

$196.56

≈ 13 movie tickets

Quarter rolls needed140
Dime rolls needed60
Nickel rolls needed150
Daily cash revenue / machine$21.00
Cash per collection / machine$147.00
Total cash per collection$1,470.00
Dollars to convert to change$1,966.00
How to Use This Calculator
  1. Enter Number of machines, Avg. transaction ($), and Daily vends / machine.
  2. Set Cash payment rate (%), Collection frequency (days), and Change buffer (%).
  3. Review Total change fund needed ($) and Change fund / machine ($).
  4. Use Quarter rolls needed and Dime rolls needed to inform your decision.

How the result changes with Collection frequency (days)

Collection frequency (days)Total change fund neededChange fund / machine
3.9$1,123.20$112.32
11$3,088.80$308.88
20$5,616.00$561.60
27$7,581.60$758.16

What each input means

Number of machines
Total machines requiring change funds.
Avg. transaction ($)
Average selling price per vend.
Daily vends / machine
Average daily transactions per machine.
Cash payment rate (%)
Percentage of transactions paid with cash. Card-enabled machines: 30-50%, cash-only: 100%.
Collection frequency (days)
Days between cash collections. Weekly (7) is typical.
Change buffer (%)
Extra change fund cushion above calculated need. 15-25% recommended.

What each result means

Total change fund needed
Total dollar amount to seed all machines with change.
Change fund / machine
Dollar amount of change needed per machine.
Quarter rolls needed
Total rolls of quarters ($10 each) for all machines.
Dime rolls needed
Total rolls of dimes ($5 each) for all machines.
Nickel rolls needed
Total rolls of nickels ($2 each) for all machines.
Daily cash revenue / machine
Cash revenue collected per machine per day.
Cash per collection / machine
Cash accumulated in each machine between collections.
Total cash per collection
Total cash to deposit across all machines per collection cycle.
Dollars to convert to change
Total bills to exchange at the bank for coins.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Number of machines = 10, Avg. transaction ($) = 1.75, Daily vends / machine = 30, Cash payment rate (%) = 40 = 6 input(s) provided
  2. Calculate Total change fund needed
    Total change fund needed = changeFundPerMachine * numMachines
    1965.6 = $1,965.6
  3. Calculate Change fund / machine
    Change fund / machine = dailyChangeNeeded * collectionFreqDays * (1 + changeBufferPct / 100)
    196.56 = $196.56
  4. Calculate Quarter rolls needed
    Quarter rolls needed = quarterRolls * numMachines
    140 = 140
  5. Calculate Dime rolls needed
    Dime rolls needed = dimeRolls * numMachines
    60 = 60

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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