LAF = (UPE + PE) / UL
Production is done around the world, not where consumer use occurs, whereas we need to calculate the UPE based on the consumer’s grid mix. We calculate Production Energy per Use Second (PEPS) using the daily usage in hours (DU):
PEPS = PE / (365 • UL • DU • 3600)
To calculate the Lifecycle Emissions Per Second of Use (LEPS), we multiply the grid intensity of the consumer’s location (GI) and the usage energy of the consumer device (UEPS) and add this to the production energy per second (PEPS).
LEPS = PEPS + GI • UEPS
The following sections outline the sources and assumptions used to calculate these metrics for various device types.
Device | Lifetime impact excluding use (kgCO2e) | Description |
---|---|---|
Desktop | 277 | Desktop; personal use; average configuration: 1 CPU, 10 GB RAM, 1173 GB HDD, 442 GB SSD, mix of integrated or separated graphic card, 6 years lifespan; RAS |
Laptop | 175 | Laptop; use mix, personal use; average configuration: 14,6 inches screen, 1 CPU, 11 GB RAM, 497 GB SSD, 5 years lifespan; RAS |
Monitor | 69 | Computer monitors; use mix, personal and professional use; average dimension (24 inches) and technology (98.6% LCD, 1.4% OLED), 6,6 years lifespan; RAS |
Device | Installed base (M) | Power Draw (w) | Usage (h/day) |
---|---|---|---|
Desktop | 72 | 59 (idle), 85 (active) | 4.6 (idle), 4.8 (active) |
Laptop | 122 | 11 (idle), 22 (active) | 3.0 (idle), 3.7 (active) |
Monitor | 101 | 30 | 5.5 |
Device | Installed base (M) | Power Draw (w) | Usage (h/day) |
---|---|---|---|
Television | 284 | 74 | 3.9 |
STB: Non-DVR | 113 | 22 | 11.7 |
STB: DVR | 54 | 13 | 11.7 |
STB: Thin Client | 33 | 7 | 11.7 |
STB: DTA Adapter | 31 | 5 | 24 |
Sound Bar | 20 | 14 (active) 9 (idle) | 4.4 (active) 5.7 (idle) |
Device | Installed base (M) | Power draw (W) | Usage (h/day) |
---|---|---|---|
Google Home Mini | 4 | 1.7 | 3.5 |
Amazon Echo (2nd gen) | 35 | 2.4 | 3.5 |
Google Home | 8 | 2.2 | 3.5 |
Apple HomePod | 3 | 5.9 | 3.5 |
Studies / Source | Car Audio (years) | Portable Receiver (years) | Hi-Fi (years) | Alarm Clock Radio & Docking Station (years) |
---|---|---|---|---|
ADEME ARCEP - France (2024) | 10 | 5 | 5 | 5 |
ACEA - Europe (2022) | 12.3 | |||
Bureau of Transportation Statistics - USA (2024) | 14 | |||
Department for Transport & Ricardo - UK (2024) | 14 | |||
FordAV - Global (N/A) | 10+ | |||
WW Assumption | 10 | 5 | 10 | 5 |
Studies / Source | Car Audio (hours per day) | Portable Receiver (hours per day) | Hi-Fi (hours per day) | Alarm Clock Radio & Docking Station (hours per day) |
---|---|---|---|---|
ADEME ARCEP - France (2024) | 0.75 | 2 | 2 | 2 |
ICT Impact - Europe (2020) | 2 | 2 | 2 | |
EBU Audio in Cars - Europe (2022) | 0.5 | |||
Rajar All Radio Listening - UK (2024) | 0.73 (20.5 hours per week, 25% in car) | |||
Edison Research Share of Ear - USA (2022) | 0.6 (1 hour and 3 min daily audio in car from which 59% is AM/FM) | |||
WW Assumption | 0.75 | 2 | 2 | 2 |
Studies / Source | Car Audio (kgCO2e) | Portable Receiver (kgCO2e) | Hi-Fi (kgCO2e) | Alarm Clock Radio & Docking Station (kgCO2e) |
---|---|---|---|---|
Derived from ADEME ARCEP LCAs | 3.62E+01 | 1.66E+01 | 3.62E+01 | 1.66E+01 |
WW Assumption | 3.62E+01 | 1.66E+01 | 3.62E+01 | 1.66E+01 |
Energy Consumption and Electricity Source | Car Audio (W) | Portable Receiver (W) | Hi-Fi (W) | Alarm Clock Radio & Docking Station (W) |
---|---|---|---|---|
ADEME ARCEP - France (2024) | 38 (diesel) | 4.8 (grid) | 38 (grid) | 4.8 (grid) |
Intertek - UK (2013) | 4.69 (grid) | |||
WW Assumption | 38 (diesel) - conservative | 4.8 (grid) | 38 (grid) | 4.8 (grid) |
118.75W
from a diesel car engine: (38(W) / 0.8 (alternator) / 0.4 (thermal engine)
).
118.75 / 8900 = 0.0133 liter
.0.0133 * 2.7 = 0.036 kgCO2e
per hour.Market | Car Audio | Portable Receiver | Hi-Fi | Alarm Clock Radio & Docking Station | Source |
---|---|---|---|---|---|
FR | 43% | 22% | 17.5% | 17.5% | ADEME ARCEP p.111 Sankey Diagram |
US | dominant (50-60%) | Edison Research - Share of Ear | |||
UK | 62% | Ofcom Audio Survey 2025 (p93) indicates share of ears by location | |||
AU | ~40+% | GfK Australian Share of Audio 2022 p.20 | |||
WW Suggestion | 50% | 25% | 12.5% | 12.5% |
Device | Lifespan (years) | Daily Usage (hours) | Total Hours | Total Embodied Emissions (kgCO2e) | Embodied Emissions per s (gCO2e) | Energy consumption per s (W) | Use Emissions per s (gCO2e) | Distribution |
---|---|---|---|---|---|---|---|---|
Car Audio. | 10 | 0.75 | 2700 (103600.75) | 3,62E+01 | 3,72E-03 (3,62E+01 / (2700 * 3600)*1000) | 38 | 0.01 (0.036 kgCO2e per hour) | 50% |
Portable Receiver | 5 | 2 | 3600 | 1,66E+01 | 1,28E-03 | 4.8 | electricity grid EF | 25% |
Hi-Fi | 10 | 2 | 7200 | 3,62E+01 | 1,40E-03 | 38 | electricity grid EF | 12.5% |
Alarm Clock Radio & Docking Station | 5 | 2 | 3600 | 1,66E+01 | 1,28E-03 | 4.8 | electricity grid EF | 12.5% |
Synthetic Radio Device | 8.125 | 1.375 | 3600 | 2.88E+01 | 0.002514375 | 6.55 (excl. car audio) |
Device | Power Draw (W) | PEPS (gCO2e/s) |
---|---|---|
Personal computer | 53.2 | 0.007 |
Tablet | 3 | 0.0029 |
Smartphone | 0.77 | 0.0058 |
TV System | 87.4 | 0.0096 |
Smart Speaker | 2.5 | 0.0061 |
Radio | 6.55 (excl. in-car) | 0.0025 |