A purchase target is not a hair-length dose

Use one dimension

The bottle planner takes mL or g for target,existing stock and each bottle. All three inputs must share that selected dimension;it does not convert grams to milliliters.

Round whole bottles

For a hypothetical1000mL target,100mL already available and295mL per bottle,the gap is900mL. Four bottles supply1180mL,leaving280mL beyond that gap.

Keep the assumption visible

The target is the user’s planning input,not an amount inferred from hair length,density,wash frequency or a medical condition. It does not guarantee stock,delivery or an item’s shelf life.

A practical distinction to keep

When existing quantity already exceeds a chosen target,the tool gives zero new bottles rather than a negative order. An odd shortfall can require a whole bottle that leaves additional quantity. That overage is shown explicitly;it does not imply the extra product should be used or establish that a larger purchase is desirable.

Before you decide

• Save exact product,use category and directions
• Keep grams separate from volume units
• Refresh selected price and unresolved label details