How do you calculate pulp yield?

Divide accepted pulp output by total furnish charged and multiply by 100. With 8 accepted against 250 charged, the yield is 8 / 250 x 100 = 3.2%. The gap to a 95% target is 3.2 - 95 = -91.8 points.

What is a good pulp yield rate?

It depends on the process: chemical kraft pulping typically yields 45-55%, while mechanical and thermomechanical pulping can reach 90-95%. A good result is one that meets or exceeds your process-specific target, which is why the gap-to-target figure matters more than the raw percentage.

Why is the example yield only 3.2%?

The default inputs (8 out of 250) are illustrative counts, not a real furnish balance. In practice you would enter matched units — tonnes of accepted pulp over tonnes of furnish — and the same formula gives a realistic yield.

Chemical vs mechanical pulp yield — what's the difference?

Mechanical pulping keeps most of the lignin, so yields are high (85-95%) but the pulp is weaker and yellows. Chemical pulping dissolves lignin for stronger, brighter pulp at a much lower yield (45-55%). Set your target accordingly before reading the gap.

What does the yield gap to target tell me?

It is your yield rate minus your target, in percentage points. A negative gap like -91.8 points means you are below commitment and losing fiber; a positive gap means you are running better than plan and may have room to push throughput.

Does pulp yield account for moisture?

Only if you enter both figures on the same moisture basis — for example both oven-dry or both air-dry. Mixing a wet output with a dry furnish will distort the yield, so keep the basis consistent.

Wood & Paper Manufacturing calculator

Pulp Yield Calculator

Pulp yield is the share of your incoming wood or fiber furnish that ends up as accepted pulp rather than rejects, screenings or process loss. Mill process engineers and fiber-line managers watch it closely because pulping is where the largest single conversion happens in a paper mill — a few points of yield swing translates directly into wood cost, chemical load and effluent. This calculator gives you the yield rate and, just as usefully, the gap in percentage points between where you are and the target you committed to, so a shortfall is impossible to hide.

What this calculator does

Estimate pulp yield for wood and paper manufacturing using production-ready inputs so teams can track KPI performance and decide whether corrective action is needed.
Use it when pulp yield in wood and paper manufacturing needs a clean rate and gap-to-target you can put on a tier board.
It divides accepted pulp output by total furnish to give a yield percentage, then shows how many points that sits above or below your target.

Formula used

Pulp yield rate = pulp yield count ÷ total pulp yield population × 100
Pulp yield gap to target = pulp yield rate - target pulp yield rate

Inputs explained

Accepted pulp output:
Total wood or fiber furnish charged:
Target pulp yield rate:

How to use the result

Use it for daily fiber-line reporting, digester or screen-room troubleshooting, or when validating a new furnish mix against a yield commitment.
It is a simple ratio of counts and assumes both figures are measured on the same consistent basis; it does not distinguish mechanical from chemical yield or adjust for moisture.

Current U.S. benchmarks

The producer price index for lumber and wood products stands at 280.994 (BLS, May 2026), up 4.2% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The producer price index for paperboard and containers stands at 276.831 (BLS, May 2026), up 8.8% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The U.S. has 13,899 wood product manufacturing establishments employing about 432,255 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate pulp yield? Divide accepted pulp output by total furnish charged and multiply by 100. With 8 accepted against 250 charged, the yield is 8 / 250 x 100 = 3.2%. The gap to a 95% target is 3.2 - 95 = -91.8 points.
What is a good pulp yield rate? It depends on the process: chemical kraft pulping typically yields 45-55%, while mechanical and thermomechanical pulping can reach 90-95%. A good result is one that meets or exceeds your process-specific target, which is why the gap-to-target figure matters more than the raw percentage.
Why is the example yield only 3.2%? The default inputs (8 out of 250) are illustrative counts, not a real furnish balance. In practice you would enter matched units — tonnes of accepted pulp over tonnes of furnish — and the same formula gives a realistic yield.
Chemical vs mechanical pulp yield — what's the difference? Mechanical pulping keeps most of the lignin, so yields are high (85-95%) but the pulp is weaker and yellows. Chemical pulping dissolves lignin for stronger, brighter pulp at a much lower yield (45-55%). Set your target accordingly before reading the gap.
What does the yield gap to target tell me? It is your yield rate minus your target, in percentage points. A negative gap like -91.8 points means you are below commitment and losing fiber; a positive gap means you are running better than plan and may have room to push throughput.

Last reviewed 2026-05-12.