Free tool
Toothpaste tube calculator.
Short answer
A 120 g tube lasts one person about 46 days at a full strip twice a day, about 100 days at a half strip, and about 8 months at a pea-size amount. Add your household to see how long yours lasts, what it costs per day, and the delivery schedule that matches.
Estimate
Enter a tube size to see an estimate.
46 days
per tube · about 7 weeks
- Tubes a year
- 7.9
- Paste a day
- 2.6 g
- Brushings a tube
- 92
Stretch it
Person
How much toothpaste to use
Paste weights are approximate. The rice-grain and pea-size amounts are the ones the ADA and the American Academy of Pediatrics give for young children. Half and full strips are common adult habits.
-
Rice grain
≈ 0.1 g
Under 3. A smear, per ADA and AAP guidance.
≈ 1200 brushings a tube
-
Pea-size
≈ 0.25 g
Ages 3 to 6. Plenty for many adults too.
≈ 480 brushings a tube
-
Half strip
≈ 0.6 g
Paste across half the bristles.
≈ 200 brushings a tube
-
Full strip
≈ 1.3 g
The ribbon in most ads. Edge to edge.
≈ 92 brushings a tube
How long a tube lasts
Days are rounded. Two people sharing a tube halve these numbers. A household of four using pea-size amounts goes through a 120 g tube in about two months.
| Tube | Pea-size | Half strip | Full strip |
|---|---|---|---|
| Travel · 0.85 oz (24 g) | 48 days | 20 days | 9 days |
| Standard · 4 oz (113 g) | 226 days | 94 days | 43 days |
| One+ · 4.23 oz (120 g) | 240 days | 100 days | 46 days |
| Large · 6 oz (170 g) | 340 days | 142 days | 65 days |
How the math works
The calculator adds up grams of paste per day: each person’s amount per brushing times brushings per day. The tube’s net weight divided by that daily total is how many days a tube lasts. It uses about 0.1 g for a rice-grain smear, 0.25 g for pea-size, 0.6 g for a half strip, and 1.3 g for a full strip.
That 1.3 g full strip is also where the “about 90 brushings” on the One+ page comes from: 120 g ÷ 1.3 g ≈ 92. At pea-size the same tube covers about 480 brushings.
For the matched delivery, the calculator compares the tubes your household uses per day with every One+ pack size (1, 2, or 3 tubes) and delivery interval (every 4 weeks to every 6 months). It shows the closest plan that keeps you covered, plus the closest plan in another pack size, which is often the one that ships free. Prices are read from the store, so they include the subscription discount.
Toothpaste amounts for kids
The ADA and the American Academy of Pediatrics recommend a smear about the size of a grain of rice for children under 3, and a pea-size amount for ages 3 to 6, with an adult supervising and the child spitting rather than swallowing. That guidance is written for fluoride toothpaste. If you use One+, use the same amounts.
Kids often use more. A 2019 CDC report found that nearly 4 in 10 children aged 3 to 6 used more toothpaste than recommended. Putting the paste on the brush for them is the simplest fix. For more, read hydroxyapatite toothpaste for kids.
What this does not tell you
These are estimates. Real amounts vary from one brushing to the next, and some paste always stays in the tube. The calculator does not tell you how much toothpaste you or your child should use; ask your dentist, especially for young children and anyone on a prescribed fluoride routine.
Klyyr makes One+ and built this calculator, so the matched delivery is always a One+ plan. The days-per-tube math works the same for any brand: choose “Other size” and enter the net weight printed on your tube.
Use less than the ads show. Reorder as often as you actually run out.
01 How long does a tube of toothpaste last?
It depends on how much you use. For one person brushing twice a day, a 4 oz (113 g) tube lasts about 43 days at a full strip, about 94 days at a half strip, and about 7 months at a pea-size amount. A 120 g One+ tube lasts about 46 days, 100 days, or 8 months on the same amounts. Add your household above for your own estimate.
02 How much toothpaste should I use?
For children under 3, the ADA and the American Academy of Pediatrics recommend a rice-grain smear, and a pea-size amount for ages 3 to 6. There is no single official amount for adults. Many dentists say a pea-size amount is enough for adults as well; the full strip shown in ads is several times that.
03 How much does a pea-size amount of toothpaste weigh?
About 0.25 g, the figure the CDC uses. A rice-grain smear is about 0.1 g. A full strip across a standard brush head is roughly 1 to 1.5 g; this calculator uses 1.3 g.
04 Why does the One+ page say about 90 brushings per tube?
It assumes a full strip of about 1.3 g, so 120 g ÷ 1.3 g ≈ 92 brushings. At a pea-size amount the same tube covers about 480 brushings. The calculator lets you set the amount each person actually uses.
05 How does the calculator pick a delivery schedule?
It divides your household’s daily paste by the 120 g in a One+ tube, then compares that with each pack size and delivery interval. The top option is the closest plan that keeps you covered. The second option, when there is one, is the closest plan in another pack size. If one tube lasts you longer than six months, it suggests a one-time tube instead of a subscription. You can change the frequency, skip, pause, or cancel from your account.
06 Does this work for other toothpaste brands?
Yes. Choose “Other size” and enter the net weight printed on the tube, in ounces or grams. The days-per-tube estimate works the same way for any paste. The matched delivery is always for One+.
07 Does the calculator save my household?
Your household, tube size, and opened date are saved in this browser’s local storage so they are there when you come back. Nothing is sent to Klyyr. Use “Start over” to clear it.