A typical 500 mL PET bottle weighs around 10–20 g; small daily habits add up to kilograms of plastic a year.
How to use the Plastic Bottle Footprint Calculator
- Bottles per day
- Weight per bottle
- Price per bottle
Results update as you type, and every field accepts the units shown in its menu.
How it works
Daily use is scaled to a year and multiplied by the bottle weight and price.
Inputs explained
| Field | What to enter |
|---|---|
| Bottles per day | A number |
| Weight per bottle | In g |
| Price per bottle | Amount in your currency |
What each result means
- Bottles per year = [Bottles per day]×365
- Plastic per year = [Bottles per day]×365×[Weight per bottle]÷1000
- Money spent per year = [Bottles per day]×365×[Price per bottle]
Example values
How the main result changes when Bottles per day changes and everything else stays at the example values above:
| Bottles per day | Plastic per year (kg) |
|---|---|
| 1 | 4.4 |
| 1.5 | 6.6 |
| 2 | 8.8 |
| 2.5 | 11 |
| 3 | 13.1 |
| 4 | 17.5 |
Formula
Bottles per year = bottles per day × 365Plastic = bottles × bottle weightWorked example
Inputs — Bottles per day: 2; Weight per bottle: 12 g; Price per bottle: $0.8.
Results — Bottles per year = 730; Plastic per year = 8.8 kg; Money spent per year = $584.00.
Frequently asked questions
Is tap water safe?
In most places with regulated supplies, yes; check local water quality reports.
Do recycled bottles count?
Recycling helps, but many bottles are never recycled.
What formula does the Plastic Bottle Footprint Calculator use?
Bottles per year = bottles per day × 365.