Compressor Parts FinderCompressor Parts Finder

Calculate Your Oil Carryover

Estimate average oil carryover by weight (PPMW) based on compressor flow, operating hours, and oil volume lost.

CFM is treated as free air delivery (inlet air volume), not compressed discharge volume.

Oil Information

Selecting an oil auto-fills its density into the calculation. Lifespan is informational and helps interpret whether the observed carryover is compatible with the expected lubricant service interval. You can override the density in Advanced assumptions.

Operating Conditions

Pressure is not applied because CFM is treated as free-air delivery. The chart below is shown for sensitivity comparison only.

What is PPMW? PPMW stands for parts per million by weight. It expresses how much oil (by mass) is carried over per million parts of compressed air (by mass). For example, 5 PPMW means 5 grams of oil for every 1,000 kg of air. It is the standard way to specify oil content in compressed air systems (e.g. ISO 8573-1 quality classes) and is independent of pressure or temperature.

Note: This is an estimated average value. Results depend on whether the CFM value represents free air delivery, as well as actual air density, oil density, temperature, pressure, and compressor operating conditions.