How Many Tattoo Cartridges Should You Stock? A Studio Reorder Worksheet

Start with the configurations you actually use. For each model, estimate demand during your replenishment window, add a buffer you can explain, then subtract usable stock and confirmed incoming units. Work in individual cartridges first; convert to boxes only when you know the pack quantity.

Count each configuration separately

A shelf full of cartridges does not mean you have the model you need for next week's bookings. Record the full brand, series, diameter, count and grouping instead of combining everything under “liners” or “magnums.”

Keep a simple log of what leaves stock. If a configuration was unavailable, note that too: low recorded usage during a stockout can hide demand. Keep practice use separate if it follows a different pattern from appointment use.

Use a replenishment window you can check

Your window should include the time until you place the next order and the expected time for that order to arrive. Use your recent delivery experience and the supplier's current information. Do not build the calculation around a delivery promise you have not confirmed.

A buffer gives you room for uncertainty. Choose it around booking changes, uneven usage and delivery variation. There is no single buffer that fits every studio or every configuration.

A worksheet for the next order

Planned order = weekly use × replenishment window + buffer − usable stock − confirmed incoming. If the result is negative, the calculation does not call for another order. This is a planning aid; review it against your bookings before purchasing.

For a hypothetical example, 8 cartridges per week over a three-week window, plus an 8-unit buffer, minus 12 usable units and 10 confirmed incoming units, gives a planned order of 10 cartridges. These numbers illustrate the arithmetic; they are not YESNeedle sales data or a stocking recommendation.

Before counting stock as usable, check its packaging, expiry information and the manufacturer's instructions. Keep units that need checking separate from the count. This worksheet does not decide whether a particular cartridge is suitable to use.

Match the order to the work

Use the result to check the relevant YESNeedle cartridge range, then confirm the exact configuration and pack quantity. Round the order to the available pack size and review the extra stock that creates.

If your preferred model is unavailable, do not treat a nearby number as an automatic replacement. Compare the actual specifications and the task first. Our tattoo needle size guide explains the code fields.

Keep the worksheet after ordering. Comparing your estimate with the next period's usage will tell you which configurations need a different buffer—and which boxes can wait.