About the Books vs e-Books Calculator
This calculator compares the carbon footprint of reading printed books against reading on an e-reader (like a Kindle or Kobo). Printed books have a small, recurring footprint per copy — paper, printing, ink, and distribution. An e-reader has a large one-time manufacturing footprint (mining and refining metals, semiconductor fabrication, plastics, battery production, and shipping) plus a very small ongoing footprint from charging. Because the e-reader's cost is front-loaded, whether it's the "greener" choice depends entirely on how many books you actually read on it.
The formula
The calculator runs two simple totals over the number of years you specify:
- Printed books total = (books read per year × years) × CO₂e per printed book
- E-reader total = e-reader manufacturing footprint + (years × annual use/charging emissions)
- Breakeven books = e-reader manufacturing footprint ÷ CO₂e per printed book
The breakeven number tells you how many printed-book-equivalents you need to read on the device before its higher manufacturing footprint is "paid back" by the printed books you avoided buying. Read fewer books than that over the device's lifetime and printed books were the lower-carbon choice; read more, and the e-reader wins.
Where the default numbers come from
Lifecycle assessments of publishing and consumer electronics are the source of the defaults used here:
- ~7.5 kg CO₂e per printed book is a commonly cited midpoint for a paperback's full lifecycle footprint — paper pulp production, printing, ink, transportation, and retail/warehouse overhead. Individual studies place typical books anywhere from about 2–8 kg CO₂e depending on paper stock, print run size, and shipping distance, so treat this as a representative average rather than a fixed constant.
- ~168 kg CO₂e to manufacture an e-reader reflects widely cited lifecycle-assessment estimates for a dedicated e-ink reader (the aluminum/plastic casing, display, battery, and circuit board production dominate this number). Full-featured tablets used for reading have a considerably larger manufacturing footprint, often 2–4× higher.
- ~2 kg CO₂e per year for charging assumes a low-power e-ink device charged occasionally, using a grid-average electricity emissions factor. This is a small fraction of the total footprint over the device's life.
- 4 years is a reasonable assumed device lifespan before replacement, upgrade, or battery degradation — adjust it to match how long you realistically keep a device.
All of these values are estimates, not universal constants — actual figures vary by publisher, print run, shipping distance, device model, and local electricity grid mix. Adjust any input to match numbers from a specific study or manufacturer disclosure if you have one.
Why the breakeven point matters more than a single "greener" label
Headlines that declare e-readers or printed books unconditionally "better for the planet" both oversimplify. A person who reads 3 books a year will likely never offset an e-reader's manufacturing footprint before replacing it; a person who reads 60 books a year on the same device will pass breakeven within the first year. The honest answer is: it depends on your reading volume, which is exactly what this calculator lets you test.