Books vs E-books Calculator — Carbon Footprint Comparison
Enter how many books you plan to read and the key carbon estimates to see whether physical books or an e-reader have the lower lifetime CO₂ footprint — and at exactly how many books the e-reader breaks even.
Physical books have a lower total carbon footprint for this many books.
- 1
Physical books total CO₂
50 × 2.5 = 125 - 2
E-reader total CO₂ (device + reading)
168 + 50 × 0.003 = 168.2 - 3
CO₂ saved by physical books
125 − 168.2 = 43.2
How does this calculator work?
Physical books cost ~2.5 kg CO₂ each; an e-reader costs ~168 kg to manufacture but only ~0.003 kg per title. The break-even is device_kg ÷ (kg_per_book − kg_per_ebook) — roughly 67 books with default estimates. Beyond that point, the e-reader is the greener choice per book read.
Formula
How this is calculated
Manufacturing a physical book — paper production, printing, and distribution — generates roughly 1–4 kg of CO₂ per book (a typical mid-length paperback is often cited around 2.5 kg). That footprint scales linearly: 50 books means 50× the emissions. An e-reader has a large upfront carbon cost (around 168 kg CO₂ for manufacturing and shipping, based on a widely-cited 2009 Cleantech Group analysis) but then adds only tiny amounts of electricity per book read — roughly 0.003 kg CO₂ each.
The break-even point is the number of books at which the e-reader's cumulative footprint (device + electricity per book) equals that of the equivalent physical books. Beyond that point, every additional book is greener on the e-reader. The formula is simply: device_kg ÷ (kg_per_book − kg_per_ebook).
These figures are estimates and depend heavily on your country's electricity grid, the specific device, book length, and supply-chain assumptions that vary year to year. The default constants (2025 working estimates) are fully editable so you can substitute figures from current life-cycle assessments. The calculator does not account for second-hand books, shared copies, or end-of-life disposal, all of which would shift the balance.
Frequently asked questions
Using the default estimates (2.5 kg per physical book, 168 kg device footprint, 0.003 kg per e-book), the break-even is about 67 books. Estimates in the literature range from 33 to 100 depending on which device, which book and which electricity grid is assumed.
Significantly. A second-hand book has effectively zero marginal carbon cost — its manufacturing emissions are already sunk. If you mainly buy second-hand or borrow from a library, physical books are likely greener than the calculator suggests.
The 168 kg device figure comes from a 2009 Cleantech Group / New York Times analysis of a Kindle; the 2.5 kg per book figure is a midpoint of several publishing-industry lifecycle studies. These are working estimates — use updated numbers from recent LCA reports if precision matters for your purposes.
TG we-Calculate Editorial Team. (2026). Books vs E-books Calculator — Carbon Footprint Comparison [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/books-vs-ebooks-calculator
TG we-Calculate Editorial Team. "Books vs E-books Calculator — Carbon Footprint Comparison." TG we-Calculate. 2026. https://we-calculate.com/calculator/books-vs-ebooks-calculator.
TG we-Calculate Editorial Team, "Books vs E-books Calculator — Carbon Footprint Comparison," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/books-vs-ebooks-calculator
@misc{wecalculate_books_vs_ebooks_calculator, title = {Books vs E-books Calculator — Carbon Footprint Comparison}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/books-vs-ebooks-calculator}}, year = {2026}, note = {TG we-Calculate} }
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