Same weight → raw vs usable kWh, illustrative CO₂, optional cost per kWh, and home/EV analogies.
Compare how much stored or chemical energy you get per kilogram, then see usable kWh after a simple efficiency model. Preset Wh/kg values are rounded from Wikipedia’s energy-density tables (LHV where typical); CO₂ and efficiency are illustrative only—not for compliance.
Open the list to search and choose any combination of carriers.
Comparison chart
Hydrogen (LHV, chemical)
- Energy density
- 33,000 Wh/kg (118.8 MJ/kg)
- Efficiency used
- 50.0%
- Total energy
- 330 kWh
- Usable energy
- 165 kWh
- Illustrative CO₂ (this mass)
- 5 kg
Home: could cover ~165 h at 1 kW (≈1 kWh/h).
EV range (illustrative): ~1,100 km at 0.15 kWh/km.
Diesel fuel (LHV)
- Energy density
- 12,667 Wh/kg (45.601 MJ/kg)
- Efficiency used
- 35.0%
- Total energy
- 126.7 kWh
- Usable energy
- 44.33 kWh
- Illustrative CO₂ (this mass)
- 31.7 kg
Home: could cover ~44.33 h at 1 kW (≈1 kWh/h).
EV range (illustrative): ~295.6 km at 0.15 kWh/km.
Lithium-ion Battery (pack)
- Energy density
- 200 Wh/kg (0.72 MJ/kg)
- Efficiency used
- 90.0%
- Total energy
- 2 kWh
- Usable energy
- 1.8 kWh
- Illustrative CO₂ (this mass)
- 100 kg
Home: could cover ~1.8 h at 1 kW (≈1 kWh/h).
EV range (illustrative): ~12 km at 0.15 kWh/km.
Energy Density Comparator helps you same weight → raw vs usable kwh, illustrative co₂, optional cost per kwh, and home/ev analogies. It is commonly used by engineers, lab users, field operators for energy density, wh per kg, battery vs fuel energy.
What it compares
Each preset row has a gravimetric energy density (Wh per kg of carrier) and a simple round-trip or end-use efficiency so you can contrast raw vs usable energy for the same mass.
Controls
- **Searchable multi-select dropdown** for energy carriers (filter and tick any combination).
- **Mass (1 g–100 kg)** scales all energies linearly (stored as grams in the UI).
- **Efficiency override** optionally applies one efficiency to every selected source (useful for “what if conversion matched?” thought experiments).
Chart
Switch raw vs usable energy on the bar chart, or plot illustrative CO₂ per kg of mass for a different lens. Log Y helps when fuels and batteries differ by orders of magnitude.
Real-world lines
Home hours assumes average load ≈ 1 kW (≈1 kWh per hour). EV km uses an illustrative 0.15 kWh per km — real vehicles vary widely.
All CO₂ and cost figures are educational placeholders, not accounting-grade data.