The CO₂ Savings
Calculator.
Plug in how many totes you've reused (or plan to reuse), and see the displaced virgin HDPE, the equivalent milk jugs, the barrels of crude oil, and the tons of CO₂ kept out of the atmosphere.
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The assumptions we use
- HDPE content per 275-gal tote: 27.5 kg (bottle only).
- CO₂-equivalent per kg of virgin HDPE production: 1.88 kg (IPCC LCA, US grid).
- Crude oil required per kg of HDPE: ≈1.75 L of crude (plus process energy).
- Standard milk jug equivalent: ≈55 g of HDPE per gallon jug.
- Transport & rinse carbon for reuse: 2.1 kg CO₂e per tote, subtracted from savings.
These are conservative numbers drawn from peer-reviewed LCA work on HDPE packaging plus our own operational metrics. We update them annually with the quarterly audit.
The math, step by step.
If you want to rebuild our number on paper, here's exactly how one reused 275-gallon tote turns into a CO₂ savings figure. Every assumption is posted so you can substitute your own and see how much the answer moves.
- 01Start with the bottle massA standard 275-gallon HDPE bottle masses 27.5 kg. The cage adds another ~32 kg of galvanized steel, which we account for separately since its LCA profile is different.
- 02Multiply resin mass by virgin HDPE emissions27.5 kg × 1.88 kg CO₂e / kg = 51.7 kg CO₂e avoided per reused bottle. The 1.88 factor is a US-grid, cradle-to-gate value consistent with peer-reviewed resin LCAs.
- 03Add the cage-steel avoidance (conservatively 40%)Cages get reused ~6 times on average. The amortized avoided emissions per reuse land around 7 kg CO₂e. Add that to the bottle figure → 58.7 kg per reuse.
- 04Subtract the wash and transport costOur triple-rinse water, electricity, and inbound/outbound freight clock in at 2.1 kg CO₂e per unit in our own operational audit. Net: 56.6 kg CO₂e per reuse.
- 05Convert to everyday numbers56.6 kg CO₂e ≈ 6.4 gallons of gasoline burned, or one passenger flight from PIT to EWR, or the carbon equivalent of 280 miles driven in a mid-sized sedan.
Where our numbers sit on the conservative side.
A lot of sustainability calculators round in their own favor. We round the other way. If we're going to publish a number that a customer might quote in a corporate sustainability report, we'd rather under-claim and back it up than over-claim and retract. Specifically:
- HDPE factor of 1.88 kg CO₂e/kgPublished industry factors range from 1.78 to 2.15 depending on region and process. We use the low end of the US-grid range.
- 27.5 kg bottle massMost 275s ship between 27 and 32 kg. We use the lower figure so the per-tote savings number comes out low, not high.
- Cage steel amortized over 6 cyclesOur actual cage-reuse average is 8.7 cycles across the ledger. We use 6 so the steel credit is pessimistic.
- Full operational cost subtractedSome calculators only subtract wash. We subtract wash, electricity, inbound and outbound freight, yard forklift fuel, and a share of building HVAC.
- No credit for water reuseOur wash loop recaptures and treats 100% of wash water on-site. We do not claim a reduction credit for this — the assumption is zero recycling.
- No biogenic offsetWe take no credit for tree-planting, offsets, or renewable energy certificates. If the number goes up, the kg went down. Nothing else.
What the output means in practice
The calculator gives you four numbers. Here's how each one connects to a real-world equivalent so the math feels like something you can see, not just a carbon accounting number.
| Output | Per tote | At 100 totes | Real-world analog |
|---|---|---|---|
| Virgin HDPE avoided | 27.5 kg | 2,750 kg | About a flatbed's worth of resin pellets |
| Milk-jug equivalents | 500 jugs | 50,000 jugs | The gallon-jug output of a dairy for a long weekend |
| Crude oil saved | 48 L (≈0.3 bbl) | 30 bbl | A single oil-tanker truck delivery to a small station |
| CO₂-equivalent avoided | 56.6 kg | 5.66 t | A year's worth of emissions from two passenger cars |
Things this calculator does not count.
Honesty requires the negative list too. Here's what our number deliberately ignores, so you can add it separately if you need a fuller accounting.
- 01The carbon cost of your own logisticsIf you truck a tote 800 miles across the country to reuse it, the math tips against you. We don't model your transport — use your own mileage factor.
- 02Landfill methane avoidedA tote in a landfill is inert HDPE and would not generate methane. So unlike food waste, reuse here does not score an additional methane credit. We prefer this honest zero.
- 03Second-order savings on your sideIf reusing a tote replaces virgin drums upstream in your own process, there's more carbon saved than we count. We leave those downstream chains to you.
- 04Social and economic externalitiesDomestic industrial reuse supports local wages, reduces import-shipping carbon, and keeps materials out of overseas recycling streams with much worse emissions. None of that is in the tonnage number.
- 05Scrap HDPE recycling endgameWhen a tank finally retires, the bottle goes to a HDPE recycler — a credit that would further lower the per-unit number. We don't pre-count it because retirement is years away for most cycles.
Using the output for your own reports
A growing share of our customers drop calculator output directly into their corporate sustainability reports. A few practical notes if you plan to do that:
- · Cite the assumptions. We expect to be challenged on our LCA factors, and the citation makes the number defensible.
- · Pull the ledger IDs for the totes you actually received. That turns a claim into an audit trail.
- · Pair the CO₂ figure with the HDPE mass. Most auditors want both, and the mass is often what gets counted toward circular-economy targets.
- · Re-run the number at the end of the reporting year, not at purchase, so your count reflects actual reuse, not intent.
- · If you move into rebottled or new units for a portion of your fleet, subtract those from the reuse count — we don't credit them as reuse.