Toothpaste Calculator. Enter your toothpaste tube capacity, pea-sizes per brush, daily brushes, number of persons, and toothpaste price — the Toothpaste Calculator tells you how long your tube will last and what it costs per day, month, and year. Also try the Hair Growth Calculator.
The amount depends on the number of people brushing, how often they brush, and how much toothpaste they use per session. Using the standard dentist-recommended pea-size (≈0.25 ml) twice a day for one person, you'll use about 15 ml per month. A household of four would need roughly 60 ml per month. See also our Total Applications — Beauty Products.
For one person brushing twice a day with one pea-size per brush, a 4 oz (118 ml) tube lasts approximately 6–7 months, assuming about 10% wastage. Add more people or brushing sessions and that duration shortens proportionally.
Divide the price of the tube by its capacity in ml (or fl oz) to get the price per unit volume. Then compare across brands and sizes — larger tubes almost always have a lower cost per ml, making them better value for families.
Dentists recommend a pea-sized amount — roughly 0.25 ml — per brushing session for adults and children aged 3 and over. Using more than this doesn't improve cleaning and increases how quickly you run through a tube.
For children from the eruption of their first tooth up to age 3, dentists recommend only a rice-grain-sized smear of toothpaste, which is about half a pea-size (≈0.1 ml). This minimizes fluoride ingestion while still protecting developing teeth.
Yes, toothpaste does expire — typically 2 years from the manufacture date. After expiry, the active ingredients (like fluoride) may become less effective. Always check the expiration date printed on the tube or box before use.
Wastage refers to the toothpaste that remains stuck inside the tube even when you squeeze as hard as you can. It's typically around 5–15% of the total tube volume. Some people cut open their tubes at the end to retrieve this extra paste.
Stick to the dentist-recommended pea-size per brush, avoid loading your brush like you see in commercials, and store the tube properly to prevent drying out. For families, consider larger bulk-size tubes which offer more ml per dollar and reduce per-use cost.