How do you calculate CO₂ capture efficiency?

Divide captured CO₂ mass flow by inlet CO₂ mass flow and multiply by 100. With 8 t/day captured against a 250 t/day inlet, that is 8 / 250 x 100 = 3.2%, leaving a 91.8-point gap to a 95% target.

What is a good CO₂ capture efficiency?

Modern post-combustion amine systems are typically designed for 90 to 95% capture, and many offtake and 45Q arrangements assume at least 90%. A result like the example's 3.2% would indicate either a severe process fault or, more likely, mismatched inlet and captured flow inputs.

Why is my capture efficiency so low in this calculation?

A 3.2% result against a 250 t/day inlet usually means the captured and inlet figures are on different bases, for instance a captured flow that excludes most of the stream or an inlet that includes total flue gas rather than its CO₂ fraction. Confirm both meters report CO₂ mass on the same basis.

What is the capture efficiency gap to target?

It is your target rate minus the achieved efficiency, in percentage points. The 91.8-point gap in the example is the distance between the measured 3.2% and the 95% target, and it is the number you act on during commissioning or troubleshooting.

Capture efficiency vs capture rate, are they the same?

They are used interchangeably for this ratio: captured CO₂ over inlet CO₂. Be careful not to confuse capture efficiency with overall plant carbon-removal efficiency, which also nets out the energy penalty and any CO₂ emitted to power the capture process.

How does capture efficiency affect 45Q credits?

45Q and most offtake contracts pay on tonnes of CO₂ captured and stored or used. A higher capture efficiency on a given inlet stream directly increases creditable tonnes, so closing the gap to target is a revenue lever, not just a performance metric.

Carbon Capture & CO₂ Compression Equipment calculator

Capture Efficiency Calculator

Capture efficiency is the percentage of inlet CO₂ that a carbon capture and compression system actually removes from a flue or process gas stream rather than venting it. Process engineers and plant operators on amine, membrane, and cryogenic capture trains track it as the headline performance number, because contracted offtake, tax credits like 45Q, and emissions permits are all written against a guaranteed capture rate. It matters because every point of shortfall against the design target is both vented CO₂ and lost revenue or credit eligibility. This calculator turns measured captured and inlet mass flows into a clean efficiency percentage and immediately shows how far that result sits from your target, so deviations surface before they become a reporting problem.

What this calculator does

Calculate the percentage of inlet CO₂ that the capture system removes, using the same time basis for captured CO₂ flow and inlet CO₂ flow.
Use it when capture efficiency in carbon capture and co₂ compression equipment needs a clean rate and gap-to-target you can put on a tier board.
It computes CO₂ capture efficiency as captured mass flow divided by inlet mass flow, and the percentage-point gap to your target rate.

Formula used

CO₂ capture efficiency = captured CO₂ mass flow ÷ inlet CO₂ mass flow × 100
Capture efficiency gap to target = target capture efficiency - CO₂ capture efficiency

Inputs explained

Captured CO₂ mass flow:
Inlet CO₂ mass flow:
Target capture efficiency:

How to use the result

Use it when commissioning a capture train, verifying performance against a 45Q or offtake guarantee, or diagnosing a drop in capture rate.
It is a mass-balance ratio only; it does not validate meter accuracy, and an unrealistic inlet figure will produce a misleading efficiency, as the default example shows.

Current U.S. benchmarks

Industrial electricity averages 8.66 cents per kWh across the U.S. (EIA, Apr 2026), up 5.5% from a year earlier. Energy-intensive steps carry this directly into unit cost.
Steel mill PPI stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. New factory orders are up 2.3% year over year (Census).

Common questions

How do you calculate CO₂ capture efficiency? Divide captured CO₂ mass flow by inlet CO₂ mass flow and multiply by 100. With 8 t/day captured against a 250 t/day inlet, that is 8 / 250 x 100 = 3.2%, leaving a 91.8-point gap to a 95% target.
What is a good CO₂ capture efficiency? Modern post-combustion amine systems are typically designed for 90 to 95% capture, and many offtake and 45Q arrangements assume at least 90%. A result like the example's 3.2% would indicate either a severe process fault or, more likely, mismatched inlet and captured flow inputs.
Why is my capture efficiency so low in this calculation? A 3.2% result against a 250 t/day inlet usually means the captured and inlet figures are on different bases, for instance a captured flow that excludes most of the stream or an inlet that includes total flue gas rather than its CO₂ fraction. Confirm both meters report CO₂ mass on the same basis.
What is the capture efficiency gap to target? It is your target rate minus the achieved efficiency, in percentage points. The 91.8-point gap in the example is the distance between the measured 3.2% and the 95% target, and it is the number you act on during commissioning or troubleshooting.
Capture efficiency vs capture rate, are they the same? They are used interchangeably for this ratio: captured CO₂ over inlet CO₂. Be careful not to confuse capture efficiency with overall plant carbon-removal efficiency, which also nets out the energy penalty and any CO₂ emitted to power the capture process.

Last reviewed 2026-05-12.