Starting Cash Bank Float Calculator

Sizes the starting cash bank for each drawer from expected cash transactions and typical change given, with a suggested bill and coin breakdown, for anyone who preps drawers before a shift.

Your estimate

Recommended starting bank per drawer...

Total float across all drawers...

Coin per drawer...

Suggested bill breakdown per drawer...

Estimates only. Assumptions are listed below, and you can change every input.

Too small a starting bank and the cashier is asking for change halfway through the rush. Too large and you have more cash sitting in every drawer than you need, which means more to count, more to lose and more to explain when a drawer comes up short. Most owners picked a round number years ago and never revisited it as prices, volume and card mix changed.

The calculator estimates how much change a drawer will hand back during a shift by multiplying expected cash transactions by the average change per transaction. It then reduces that figure by the share of change you expect to cover with bills customers hand over during the shift, adds your safety buffer, and rounds up to the nearest five dollars. The bill and coin breakdown is a starting point, not a rule; adjust it toward whatever your drawer actually runs out of first.

How to use this tool

Look up a typical shift on your POS tender report and enter the number of cash transactions and the average change handed back.
Set how much change you expect incoming customer bills to cover, add a safety buffer, and choose what share of the bank should be coin.
Read the recommended bank per drawer and the total float, then use the breakdown as a starting mix and adjust toward whatever the drawer runs out of first.

What the math assumes

Change needed for the shift equals cash transactions times average change per sale, before any incoming cash is reused.
The share of change covered by incoming customer cash is applied as a flat reduction; the 50% default is a placeholder, not a measured figure.
The bank is always rounded up to the nearest five dollars so it can be built from standard bills and coin rolls.
The bill breakdown puts roughly 30% of bill value in twenties, 25% in tens, 25% in fives and the remainder in ones, rounded to whole bills.
Coin is held at the share you set and is not broken down by denomination; split it across quarters, dimes, nickels and pennies to match your price points.

Frequently asked questions

Why is the recommended bank smaller than the change my drawer hands out?

Because the bills customers pay with are reused as change during the shift. The tool only holds back the share you say incoming cash will not cover, plus your buffer. Set the incoming share to zero to see the worst case.

Should every drawer have the same starting bank?

Not necessarily. A bar drawer with round prices and lots of twenties needs a different mix than a bakery drawer with odd cents. Run the tool once per drawer type and prep them differently.

How often should I revisit the starting bank?

Any time prices, hours or card mix shift noticeably, and at least when you plan a seasonal schedule. A drawer that keeps needing a change run or keeps ending with a thick stack of ones is telling you the bank is off.

Link to this toolhttps://tillclosr.com/tools/starting-bank-float/

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