Travel Cost, CO₂ & Time
Compare car, EV, train, bus and flight on one trip.
Energy & Environment
Estimate travel and flight CO₂, electricity use and home energy—then act on the biggest, easiest wins.
Who this hub is for
Travelers comparing modes, households tracking electricity, and anyone wanting a quick, transparent view of their footprint. Each tool exposes key assumptions so you can customize factors to your country, tariff or vehicle.
Note: Results are indicative estimates for awareness and planning only—not official carbon accounting or legal advice. Assumptions and factors vary by source.
Best Energy & Environment Tools (Quick Picks)
Compare Tools
| Tool | Best For | Inputs | Outputs | |
|---|---|---|---|---|
| CO₂ Emission (generic) | Quick mode-specific estimate | Mode, distance, factor/occupancy | kg CO₂e | Open |
| Travel Cost, CO₂ & Time | Trip planning across modes | Origin/destination or distance, mode options, cost and speed | Cost, time, kg CO₂e per mode | Open |
| Flight CO₂ | Per-passenger flights | Route, cabin, RF toggle | kg CO₂ / CO₂e | Open |
| Electricity Consumption | Appliance energy use | Wattage, hours, tariff | kWh, cost (and optional CO₂) | Open |
| Home Energy Audit | Prioritizing upgrades | Home size, insulation, heating, windows | Biggest savings opportunities | Open |
| Daily Water Usage | Household water awareness | People, fixtures, habits | Liters/day by activity | Open |
| Fuel Cost | Trip fuel budgeting | Distance, l/100km or mpg, price | Total fuel & cost | Open |
Transport & Travel
- Travel Cost, CO₂ & Time — compare car/EV/train/bus/flight on one route.
- Flight CO₂ — per-passenger emissions with optional radiative forcing uplift.
- CO₂ Emission (generic) — distance × factor for a quick estimate.
- Fuel Cost — simple trip budgeting (pairs well with Travel tool).
Home Energy & Utilities
- Electricity Consumption — kWh and cost per device.
- Home Energy Audit — find your top efficiency opportunities.
- Daily Water Usage — liters/day by activity.
Worked Examples
- Weekend trip choice: Compare Berlin ↔ Hamburg by car (petrol), ICE train and flight in Travel Cost, CO₂ & Time. Check which option is fastest, cheapest and lowest-CO₂.
- Flight with RF uplift: Estimate a round-trip economy flight with the Flight CO₂ tool. Toggle the radiative forcing uplift to see how non-CO₂ effects change results.
- Home standby load: Add a TV (90 W × 3 h/day), router (10 W × 24 h) and fridge (160 W × 8 h) in Electricity Consumption and compare annual kWh and cost at your tariff.
Frequently Asked Questions
How are travel CO₂ emissions calculated?
We multiply distance by an emissions factor per km for the selected mode and optional occupancy. Advanced fields let you pick vehicle type, fuel or EV efficiency.
Do you use a radiative forcing uplift for flights?
Yes—the flight tool includes an optional RF uplift to approximate non-CO₂ effects at altitude. You can toggle it on/off.
Why do your results differ from other calculators?
Different tools use different factors, routes, load assumptions and RF treatment. We show assumptions so you can align inputs to your context.
Can I compare car vs train vs flight on the same trip?
Yes. Use the Travel Cost, CO₂ & Time tool to compare modes side-by-side including cost, time and emissions.
How do you estimate home electricity use?
Energy = Power × Time. Enter wattage and hours (or use presets) and set your tariff. Optional CO₂ can reflect your grid’s emissions factor.
My country’s grid is cleaner/dirter—can I change it?
Yes—adjust the grid emissions factor (gCO₂/kWh) in the tool. Many utilities publish this annually.
Is water usage part of the footprint?
Water has energy and treatment impacts. The Daily Water Usage tool estimates liters/day by activity.
Do you store my trips or appliance data?
No. Calculations run locally in your browser; we don’t store your inputs.
Is this official carbon accounting?
No—these are indicative estimates for awareness and planning. For formal reporting, follow your program’s required methodology.
How can I reduce my footprint?
Reduce first: choose lower-emission modes, avoid flights where practical, improve home efficiency and habits. Consider green tariffs or verified offsets if appropriate.
Energy & Environment Disclaimer
These tools provide indicative estimates for educational and planning purposes only. They do not replace official greenhouse-gas accounting or compliance reporting.
- Assumptions: Emissions factors, routes, occupancy and RF treatment vary by source and region. Adjust inputs to reflect your context.
- Electricity factors: Grid emissions (gCO₂/kWh) change over time and by supplier. Use your utility’s latest data where possible.
- No warranty: Results are provided “as is,” without guarantees. For regulatory use, follow the methodology required by your program.
- Privacy: Calculations run in your browser; inputs aren’t stored. See Legal & Privacy.
Related Hubs
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