What we count
Proved reserves that can be economically recovered with reasonable certainty under current knowledge, prices and technology.
Estimated remaining proved oil reserves
How much of the world's proved oil reserves would theoretically remain if production continued at the 2025 rate.
Calculated at the 2025 production rate
WORLDRelated numbers in context
216,915,878,684,932estimated remaining proved natural gas reserves
1,070,000,000,000latest published proved coal reserves
655,000,000people without access to electricity
What lies behind this number
Proved reserves that can be economically recovered with reasonable certainty under current knowledge, prices and technology.
How the source derives it
OPEC compiles the world total from nationally reported proved crude-oil reserves and crude-oil production under the consistent definitions used in its statistical bulletin.
What one number cannot show
This is not a date when oil will run out. Proved reserves change with discoveries, prices, technology and revisions, while actual production varies over time.
Source value
The scenario begins with the reserve value from OPEC Annual Statistical Bulletin 2026 for reserves at 31 December 2025; 2025 world production.
How the value is used: The calculation shows a constant-production scenario, not a forecast of future development.
Starting reserves1,572,460,000,000barrels
- Period
- reserves at 31 December 2025; 2025 world production
- Status
- published
- Primary data source
- OPEC Annual Statistical Bulletin 2026
How the number is calculated
We subtract an even share of the latest annual production rate from the starting reserve value.
Formula used
R(t) = R₀ − annual production × elapsed timeReference value1,572,460,000,000reserves at 31 December 2025; 2025 world production
Annual production−27,320,250,000barrels per year
Calculation interval0.1 sCalculated at the 2025 production rate
Source value
OPEC Annual Statistical Bulletin 2026 reports the latest published figure used on this page for reserves at 31 December 2025; 2025 world production.
Calculation method
We subtract an even share of the latest annual production rate from the starting reserve value.
Smooth display
The result is recalculated on screen every 0.1 seconds.
Where the data comes from
The source value comes from OPEC Annual Statistical Bulletin 2026 and refers to reserves at 31 December 2025; 2025 world production. It is the latest figure published by this source. OPEC compiles the world total from nationally reported proved crude-oil reserves and crude-oil production under the consistent definitions used in its statistical bulletin.
Latest published and verified source value
- Publisher
- OPEC Annual Statistical Bulletin 2026
- Data period
- reserves at 31 December 2025; 2025 world production
- Verified
- 13 August 2026
- Coverage
- Worldwide
- Use
- Constant-production scenario