How do you calculate RO recovery rate?

Divide permeate flow by feed flow and multiply by 100. With 8 m³/hr permeate against 250 m³/hr feed, recovery is 8 ÷ 250 × 100 = 3.2%.

What is a good RO recovery rate?

Single-pass seawater RO typically runs 40-50% recovery, while brackish RO can reach 75-85% with adequate antiscalant. The right target depends on feed salinity and scaling potential, not a universal number.

Why is the example recovery only 3.2%?

The 8 m³/hr permeate against 250 m³/hr feed gives a deliberately low 3.2% — a realistic skid would have permeate much closer to feed. Replace the defaults with your actual flows to get a meaningful number.

What happens if recovery is too high?

Concentrate gets more saline and scaling-prone, raising osmotic pressure and the risk of carbonate or sulfate scale on the tail elements. That is why the scaling indices, not just the flow ratio, govern the safe ceiling.

Recovery rate vs salt rejection — what is the difference?

Recovery is how much feed becomes permeate (a volume ratio); salt rejection is how much dissolved salt the membrane removes (a quality measure). A plant can have high recovery and poor rejection or vice versa.

What does the recovery gap to target tell me?

It is actual recovery minus target. A negative gap means you are below setpoint and may be wasting feed and energy; the example shows a 91.8-point gap purely because of the mismatched default flows.

Desalination & Membrane Water Treatment Equipment calculator

RO Recovery Rate Calculator

RO recovery rate is the percentage of feed water that comes out as permeate rather than going to concentrate, and it is the master variable that sets a desalination plant's economics. Push recovery too high and you concentrate the reject stream toward scaling and osmotic limits; run it too low and you waste feed water and pumping energy. Operators and design engineers use recovery to size systems, control concentration polarization, and stay inside the scaling envelope set by their antiscalant program. This calculator converts your permeate and feed flows into actual recovery and shows the gap to your target setpoint.

What this calculator does

Calculate reverse osmosis recovery by comparing permeate flow with feed flow so engineers can estimate concentrate volume, scaling risk, and production capacity.
Use it when ro recovery rate in desalination and membrane water treatment equipment needs a clean rate and gap-to-target you can put on a tier board.
It computes actual recovery as permeate flow divided by feed flow times 100, plus the gap in points to your target recovery.

Formula used

Actual RO recovery = RO permeate flow ÷ RO feed flow × 100
Recovery gap to target = actual RO recovery - target RO recovery

Inputs explained

RO permeate flow:
RO feed flow:
Target RO recovery:

How to use the result

Use it during commissioning to verify the array hits design recovery, or in daily operation to confirm you are inside the scaling-safe window.
It is a single-pass system ratio; it does not check concentrate-side scaling indices (LSI, S&DSI) that ultimately cap how high recovery can safely go.

Current U.S. benchmarks

Global copper trades at $13,484 per tonne (IMF via FRED, May 2026), up 41.5% in a year, and U.S. industrial electricity averages 8.66 cents per kWh. Both feed electrified-hardware unit economics.
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 RO recovery rate? Divide permeate flow by feed flow and multiply by 100. With 8 m³/hr permeate against 250 m³/hr feed, recovery is 8 ÷ 250 × 100 = 3.2%.
What is a good RO recovery rate? Single-pass seawater RO typically runs 40-50% recovery, while brackish RO can reach 75-85% with adequate antiscalant. The right target depends on feed salinity and scaling potential, not a universal number.
Why is the example recovery only 3.2%? The 8 m³/hr permeate against 250 m³/hr feed gives a deliberately low 3.2% — a realistic skid would have permeate much closer to feed. Replace the defaults with your actual flows to get a meaningful number.
What happens if recovery is too high? Concentrate gets more saline and scaling-prone, raising osmotic pressure and the risk of carbonate or sulfate scale on the tail elements. That is why the scaling indices, not just the flow ratio, govern the safe ceiling.
Recovery rate vs salt rejection — what is the difference? Recovery is how much feed becomes permeate (a volume ratio); salt rejection is how much dissolved salt the membrane removes (a quality measure). A plant can have high recovery and poor rejection or vice versa.

Last reviewed 2026-05-12.