Reduce Your Plastic Calculator

What Is the Reduce Your Plastic Calculator?

Cutting plastic waste starts with a clear goal. This calculator compares your current weekly plastic use against a target you set for six common items: plastic bags, water bottles, coffee cups, straws, food containers, and shampoo bottles. It shows how much plastic, CO₂, and energy you can save per year by sticking to your plan.

How Savings Are Calculated

For each item, enter your current usage and your goal usage per week. The calculator multiplies the difference by the item weight and by 52 weeks to estimate annual plastic savings in kilograms. Environmental impact uses standard conversion factors:

• Plastic weight: item count × weight per item × 52 weeks
• CO₂: about 1.5 kg CO₂ per kg of plastic (plastic bags use roughly 1.5 g CO₂ per bag)
• Energy: about 4.6 MJ per kg of plastic produced

$$\text{plastic saved (kg/year)} = \frac{(\text{current} - \text{goal}) \times \text{weight (g)} \times 52}{1000}$$

For example, reducing plastic bags from 6 to 2 per week saves about 1 kg of plastic per year and lowers associated CO₂ and energy footprints proportionally. The percentage reduction shows how close your goal gets you to zero plastic for the selected items.

Practical Tips to Reach Your Goals

• Plastic bags: Keep reusable cloth bags in your car, backpack, and by the front door. Our Bag Footprint Calculator helps compare reusable alternatives.
• Water bottles: Carry a refillable bottle and use tap water when safe.
• Coffee cups: Bring your own mug — billions of disposable cups are discarded every year.
• Straws: Skip them entirely or switch to reusable steel or silicone straws.
• Food containers: Pack lunch in reusable containers instead of take-away boxes.
• Shampoo bottles: Try shampoo bars or refill stations to avoid buying new bottles.

To understand your full baseline first, use the Plastic Footprint Calculator. For broader context, explore the Global Plastic Policy Calculator or the Meat Footprint Calculator.