Calculate blank press-on tips needed by recorded size

To find how many blank tips you need in a given size, multiply the number of sets you plan to make by the number of pieces of that size each set uses. Add those results across every type of set you are planning. Then subtract the pieces of that size you already own and haven't set aside for something else. If the answer is zero or less, you don't need any more of that size. One qualification matters: the calculation only works within a single tip system. Size labels from different brands or product lines don't line up, so a size from one box can't be counted toward another.

Pin down the tip system first

Before entering any numbers, write down the details that define which tips you are counting. Check each one against the product you chose and the pieces actually in your box, because a listing can differ from what arrives.

• The tip system and its exact product name or identifier
• The manufacturer's size reference, such as its numbered or lettered size chart
• The number of pieces per size the assortment says it contains
• Your own count of pieces per size, if you already have the box

If you use more than one tip system, give each system its own worksheet section. Don't merge them or assume a standard size spread across brands. Matching tip sizes to your nails is a separate step. Do that fitting first, then bring the resulting size list into this worksheet.

Set up the worksheet

A set profile is one kind of set you plan to make, such as a full set for one person's hands. For each profile, record how many sets you intend to make and how many pieces of each recorded size one set uses. Then give each size its own row with these columns:

System

Recorded size

Pieces per set (by profile)

Intended sets

Required pieces

Owned pieces available for this plan

Additional pieces

Surplus

Take owned counts from your existing inventory records or a fresh count. Only include pieces that aren't already set aside for another project. Count each owned piece once across the whole plan, even if several profiles use the same size.

The calculation rules

For each recorded size:
  required   = sum over all profiles of (intended sets × pieces of this size per set)
  additional = max(0, required − owned available)
  surplus    = max(0, owned available − required)

Worked example (invented numbers)

This example uses made-up labels and quantities to show the arithmetic only. Within one tip system, profile A uses two size S pieces per set, and you plan three sets. Profile B uses one size S piece per set, and you plan two sets. You own five size S pieces that aren't committed elsewhere.

Profile	Size	Pieces per set	Intended sets	Required
A	S	2	3	6
B	S	1	2	2
Total for S				8
Owned available (S)				5
Additional needed (S)				3
Surplus (S)				0

Required S = 3 × 2 + 2 × 1 = 8. With five already on hand, you need three more size S pieces. Repeat the same steps for every other size on your list.

When a box lists only a total count

Some assortments, such as a 120-piece box of clear full-cover tips, state only how many pieces are in the whole box. A total count can't tell you whether the box covers your need for a particular size. If you don't know how many size S pieces the box holds, leave that size's package coverage marked as unresolved. Fill it in only after you confirm the per-size breakdown from the manufacturer's listing or by counting the contents.

Check your entries before trusting the result

• Use whole numbers of zero or more. Enter 0 only when you've confirmed you have none, and leave unknown counts blank and unresolved.
• For each profile, make sure the per-size counts add up to the total pieces you expect in one set.
• Look for duplicate rows for the same size within a system and combine them.
• Don't calculate any row whose tip system or size reference isn't confirmed yet.

What the result tells you

The additional column gives a piece count, not a number of boxes to buy. Turning it into packages requires the confirmed per-size makeup of the specific assortment you're considering. The formula also adds no extras for breakage, filing mistakes or test fits. If you want spares, add them as a separate number you choose deliberately, so the base count stays accurate.