Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Consumption accounting only. The entered amount per use is not a dental dosage recommendation.
Example Calculation
- Tube net mass: 100 g
- Mass per use: 0.5 g
- Uses per person per day: 2
- People sharing: 2
A 100 g tube at 0.5 g per use, twice daily for two people, lasts 50 days.
Frequently asked questions
How do I use this calculator?
Enter tube net mass, mass per use, uses per person per day, people sharing. The result updates automatically. Use Reset to restore the example values.
What method does it use?
days=tube mass/(mass per use × daily uses × people).. Consumption accounting only. The entered amount per use is not a dental dosage recommendation.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.