Decision Tools

Coolant Mixing Calculator

Free engineering calculator - no signup, runs in your browser.

DEW Machine Shop Tools

Inputs

Sump / Tank Volume (gal) Target Concentration (%)

Typical: 5–8% general machining, 8–12% grinding/hard alloys — confirm against your coolant's data sheet

Refractometer Factor

Coolant-specific multiplier (check data sheet); use 1.0 if unknown

Readout

CONCENTRATE TO ADD

— gal

WATER TO ADD

— gal

REFRACTOMETER TARGET READING

—

Mix ratio by volume. Always add concentrate to water, not water to concentrate. Verify against your coolant manufacturer's data sheet.