Toothpaste Calculator
Calculate how long your toothpaste will last and estimate yearly costs for oral hygiene
Calculate Toothpaste Duration
Volume of toothpaste in the tube
Toothpaste left in tube that can't be squeezed out
Recommended: 1 pea-size (0.25 ml) per wash
Recommended: 2-3 times per day
Number of people sharing this toothpaste
Price of one tube for cost calculations
Toothpaste Duration Results
Daily Usage
Per person: 0.50 ml
Total household: 0.50 ml
Effective capacity: 90.0 ml
Monthly Consumption
Monthly usage: 15.3 ml
Tubes per year: 2.0
Toothpaste Usage Tips
Example Calculations
Standard 4 oz Tube
Capacity: 118 ml (4 fl oz)
Single person: 2 brushes/day
1 pea-size per wash: 0.25 ml
10% wastage: 106.2 ml effective
Duration: ~7 months
Family of 4
Same 4 oz tube
4 people × 2 brushes: 2 ml/day
Duration: ~7 weeks
Monthly need: ~17.5 ml/person
Large 6 oz Tube
Capacity: 177 ml (6 fl oz)
Single person: ~10.5 months
Couple: ~5.25 months
Family of 4: ~2.6 months
Oral Health Facts
Pea-size Amount
1 pea-size (0.25 ml) contains enough fluoride for effective cleaning
Brush Duration
Brush for 2 minutes, twice daily for optimal oral health
Expiration
Most toothpastes last 2 years from manufacture date
Common Tube Sizes
Money-Saving Tips
Compare price per ml/oz across different brands and sizes
Buy larger tubes for better value if you have storage space
Cut open the tube to get the last 10-15% of toothpaste
Stock up during sales but check expiration dates
Understanding Toothpaste Consumption
How Much Do You Really Need?
Despite what toothpaste commercials show, dentists recommend using only a pea-sized amount (about 0.25 ml) of toothpaste per brushing. This provides enough fluoride for effective cleaning without waste.
Calculation Formula
Daily usage = Pea-sizes × Daily brushes × 0.25 ml
Duration = (Capacity × (1 - Wastage%)) / (Daily usage × People)
Factors Affecting Duration
- •Amount used per brushing (pea-size recommended)
- •Brushing frequency (2-3 times daily ideal)
- •Number of people sharing the tube
- •Wastage (typically 5-15% remains in tube)
Real-World Examples
Average Single Person
• 4 oz tube (118 ml)
• 2 brushes daily with 1 pea-size
• Daily consumption: 0.5 ml
• Duration: ~7 months
• Monthly need: ~17.5 ml
Family of Four
• Same 4 oz tube shared
• Daily consumption: 2 ml total
• Duration: ~7 weeks
• Need ~6-7 tubes per year
Pro Tip: Using more than a pea-size doesn't improve cleaning effectiveness but does increase costs and may cause excessive foaming.