https://unmineable.wordpress.com/2026/08/08/unmineable-calculator/
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
71
GRADE
C
FIX
3
REVIEW
3
PASS
1
INFO
1
Checks
81 PASS 3 REVIEW 3 FIX
DCO2 Per Page LoadAction1.06g CO2 per viewFIX
CO2 Per Page Load
Action1.06g CO2 per view
1.06g CO2 per view
Warning::
1.06g CO2 per page view
This page transfers 3.7 MB, producing an estimated 1.06g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.20g, network 0.18g, end-user device 0.68g.
Got: 1.06g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 126.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 126.9 kg of CO2 annually — equivalent to charging 15866 smartphones.
1.06g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 37% of websites
Sustainable Web Design model v4 · Page size: 3.7 MB
Your site
1.06g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.20g
Network
0.18g
End-user device
0.68g
At 10,000 monthly views: Monthly: 10.6 kg · Annual: 126.9 kg · ≈ 15866 smartphone charges
DGreen HostingActionNot greenFIX
Green Hosting
ActionNot green
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
Info::
Green hosting status based on known provider commitments
Green hosting detection uses a curated database of provider renewable energy commitments. This is not a real-time verification. For authoritative checks, visit thegreenwebfoundation.org.
Green HostingNot Green Hosted
Hosting WordPress.com✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
DCarbon BudgetAction63th percentileFIX
Carbon Budget
Action63th percentile
63th percentile
Warning::
1.06g CO2 — above the median website (0.60g)
Heavier than an estimated 37% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 63th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.06g
63rd percentile
Cleaner than 37% of websites
✗ Above the median website
vs Median 76% more
vs Target 112% more
BTransfer Efficiency88% efficientREVIEW
Transfer Efficiency
88% efficient
88% efficient
Info::
Transfer efficiency: 88%
An estimated 456 KB (12%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 456 KB of unused JavaScript. This wasted data produces 0.13g of unnecessary CO2 per page view.
Total waste: 456 KB (12% of page weight)
Unused JS 456 KB
0.13g unnecessary CO2 per visit
Actual transfer 3824 KB
Theoretical minimum 3367 KB
Potential savings 456 KB (0.13g CO2)
See Deep Analysis sections above for specific optimizations.
BWeb Font Weight VariantsNo detectable Google Fonts weightsREVIEW
Web Font Weight Variants
No detectable Google Fonts weights
No detectable Google Fonts weights
Info::
No detectable Google Fonts weights
The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
A+Repeat Visit Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 51 KB (vs 3824 KB first visit). 98 of 101 resources are served from browser cache, saving 1.04g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.06g)
First visit
3824 KB
Repeat visit
51 KB
99% reduction on repeat visits
Saving 1.04g CO2 per returning visitor
98 resources served from cache · 3 resources re-downloaded
Image Optimization22 images, 753 KB total, 40 KB wastedINFO
Image Optimization
22 images, 753 KB total, 40 KB wasted
Image Optimization Audit
Total Images
22
Total Size
753 KB
Oversized
12
Wasted
40 KB
2 missing dimensions 16 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.