Compare modeled recycling energy benefits for aluminum cans, PET, paper, glass and steel by weight or item count, or solve for a target mass. Select EPA WARM v16, an explicitly historical illustration, or a documented custom factor. Energy, appliance and price outputs are comparisons, not household electricity or bill savings.
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Recycling Energy Savings Formula
Energy benefit equals recycled mass multiplied by the selected benefit factor. Match the material, mass unit and comparison boundary. The default EPA WARM v16 basis compares recycling with landfilling and reports life-cycle energy, including fuels, converted to kWh equivalent. It is a screening estimate, not electricity generated or delivered:
E = S * W
To work backward and find how much you must recycle to reach an energy goal, divide the goal by the per-ton saving:
W = E / S
When you enter a count of items instead of a weight, the weight is the count times the typical weight of one item, and that weight is then used in the formula above:
W = n * w
Variables:
- E is the energy saved, in kilowatt-hours (kWh)
- S is the selected energy benefit in kWh equivalent per US short ton (2,000 lb = 907.18474 kg)
- W is recycled mass in US short tons
- n is the number of items you recycle
- w is the assumed or measured average item mass in US short tons
Choose energy from amount or amount for an energy goal. Enter a mass or a whole-item count, then select the factor basis. Item mode lets you replace the illustrative item weight with a measured average. Under Energy comparison assumptions, edit phone/home energy assumptions or enter an electricity price. The price result is only a hypothetical comparison, not a utility saving, rebate or recycling payment.
Energy Saved by Material
Default EPA WARM v16 Exhibit 7-1 gives rounded benefits of recycling relative to landfilling: aluminum cans 153.0, PET 28.9, mixed paper (general) 20.4, glass 2.4, steel cans 20.2 and newspaper 16.6 million Btu per US short ton collected for recycling. Multiply by 293.0710701722 to express these life-cycle energy values as kWh equivalent. Published factors are rounded to 0.1 million Btu; extra calculation digits do not imply greater model accuracy. EPA WARM v16 technical documentation. The table below preserves the older illustrative figures, not the WARM defaults. A 2005 public-information source gives these historical figures without a reproducible current model or specified ton convention. This calculator explicitly assumes US short tons for that scenario; generic plastic and office-paper figures are not validated PET or mixed-paper factors.
| Material | Historical kWh per assumed US short ton | Comparable percentage derived here? | Energy comparison at 29 kWh/day |
|---|---|---|---|
| Aluminum | 14,000 | Not derived | 483 days |
| Plastic (generic historical) | 5,774 | Not derived | 199 days |
| Office paper (historical) | 4,100 | Not derived | 141 days |
| Steel / tin cans | 642 | Not derived | 22 days |
| Newspaper | 601 | Not derived | 21 days |
| Glass | 42 | Not derived | 1.4 days |
The next table illustrates the historical option with assumed item weights; those weights vary in practice. Its energy-scale LED runtime comparison uses 10 W (0.01 kW), not electricity produced by recycling. The historical plastic figure is generic, and all ton values in this illustration assume US short tons.
| Item | Typical weight | Energy saved | 10 W LED bulb runtime |
|---|---|---|---|
| Aluminum can | 15 g | 0.23 kWh | 23 hours |
| Plastic bottle (PET) | 10 g | 0.064 kWh | 6.4 hours |
| Glass bottle | 300 g | 0.014 kWh | 1.4 hours |
Example Problems
Example 1: historical illustration by weight. Select Historical illustration — 2005 and enter 100 lb of aluminum. Using the stated US-short-ton assumption, 100/2,000 = 0.05 tons; 0.05 × 14,000 = 700 kWh in that scenario. Dividing by an assumed 29 kWh/day gives 24.14 home-use energy comparisons. This is not actual electricity supplied or a bill saving. With the default rounded WARM aluminum-can factor, the same mass instead gives about 2,241.99 kWh of life-cycle energy equivalent relative to landfilling.
Example 2: historical goal illustration. Select Historical illustration — 2005 and glass. A 500 kWh goal divided by the historical 42 kWh per assumed US short ton gives 11.9048 short tons, about 23,809.52 lb. The historical aluminum scenario gives about 71.43 lb. With the default WARM glass factor, the result is about 644.88 kg instead. These are different documented scenarios, not interchangeable measurements.
FAQ
How much energy does recycling one aluminum can save?
The result depends on the selected factor and actual can mass. At an illustrative 15 g, the historical scenario gives about 0.2315 kWh, while the rounded WARM v16 aluminum-can factor gives about 0.7414 kWh of life-cycle energy equivalent relative to landfilling. Neither is electricity delivered to a household. Use measured average mass and an appropriate documented factor for your purpose.
Why do glass and aluminum give different results?
The manufacturing processes, material recovery, energy sources and comparison boundary differ. A single per-mass benefit does not establish a universal percentage reduction or determine the best local recycling decision. Check accepted materials and local processing; do not infer current PET, paper or glass percentage savings from the historical table.
Is the energy saved the same as the carbon saved?
No. This calculator reports energy in kilowatt-hours, not greenhouse gas emissions. The two are related, because most energy still comes from fuels that release carbon, but the exact carbon savings depend on the energy mix used in production and would need emission factors to estimate. Use the kWh figure here as an energy measure, and treat any carbon estimate as a separate calculation.
