Orçamento carbono restante
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
420 Gt / emissões
About this calculator
The 'Remaining carbon budget' calculator estimates how long the global carbon budget will last to keep global warming under 1.5°C. It uses the formula 420 Gt CO₂ divided by annual emissions. This 420 Gt value is a simplified estimate from scientific studies (UN, IPCC) representing the total greenhouse gases that can still be emitted before crossing the 1.5°C threshold.
To use it, input annual CO₂ emissions from an activity, company, or country. The result shows how many years remain in the budget. For example, if a region emits 10 Gt/year, the calculation is 420 ÷ 10 = 42 years. This provides a straightforward view of environmental impact relative to climate goals.
This tool is useful for decarbonization planning, carbon trading, or environmental education. However, note that 420 Gt is a simplified average. Factors like carbon capture, policy changes, and future global emissions could alter this number. It also excludes other gases like methane.
The result isn't a substitute for detailed technical analysis but serves as a starting guide to understand the urgency of emission reductions. Use it with real emissions data and climate specialists for effective action.
Frequently asked questions
Where does the 420 Gt CO₂ value come from?
The 420 Gt is a simplified average from UN and IPCC studies. It represents the global budget to keep warming under 1.5°C, considering cumulative emissions up to 2020.
How does the calculator work?
It divides 420 Gt by the annual emissions entered by the user. For example, 420 ÷ 10 Gt/year = 42 years remaining. The result estimates time until the budget is exhausted if emissions stay constant.
Who is this calculation useful for?
It's relevant for individuals, businesses, governments, or organizations wanting to understand climate impact and plan reductions. It helps compare actions with the 1.5°C goal.
Is the result accurate?
Not 100% accurate. The 420 Gt budget is a simplified estimate. Factors like emissions from other gases, carbon capture, and global emission pattern changes affect the real value.
How to use this calculation to reduce emissions?
Compare the remaining time with decarbonization goals. A short result means immediate reductions are needed. Use it as a basis to calculate realistic annual emission cut targets.