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Engineering · Calculators

Coolant ratio / mix calculator.

Coolant runs best at the manufacturer's specified concentration — too rich wastes money and irritates skin; too lean drops corrosion protection and accelerates rancidity. This calculator gives the concentrate-to-water split for any sump size.

Units:
3%5%8%10%15%

Typical concentrations

  • General machining5–8%
  • Heavy-duty / steel8–10%
  • Aluminum5–7%
  • Stainless / Inconel8–12%
  • Grinding3–5%
  • Sawing / threading10–15%
Mixing tip: Always add concentrate to water — never water to concentrate (the “OIL” rule: Oil In Last — add the concentrate to the water). Adding water last causes premature emulsion break.

Keep exploring

Related tools & references

Speed & feed calculator→

Good coolant lets you push speeds toward the high end.

Material removal rate calculator→

Heavier cuts need correct coolant concentration.

Material datasheets→

Coolant preferences and machining notes by alloy.

Cycle time estimator→

Plan run time alongside coolant and tooling.

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