Everyday life

Toothpaste Calculator

Estimate how long a tube of toothpaste lasts.

Tube size

Toothpaste per brush

Brushes per day

Calculated Output

Days it lasts (days) 50

Formula: days = tube ÷ (per brush × brushes per day)

Step-by-Step Breakdown

1. Values used:

2. Tube size = 100

3. Toothpaste per brush = 1

4. Brushes per day = 2

6. Tube size x Toothpaste per brush = 100 x 1 = 100

7. Days it lasts = (Tube size x Toothpaste per brush) / Brushes per day = 100 / 2 = 50days

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The math behind it

days = tube size ÷ (grams per brush × brushes per day). A pea-sized amount is ~0.25 g; many use ~1 g.

100 g tube, 1 g × 2/day → 50 days.

Use less?

A pea-sized amount is plenty and stretches the tube much further.