Note: This calculator is designed for CNC machining coolants used in metalworking, not automotive antifreeze.
Accurately calculate top up volumes and new fill ratios for your CNC machine coolant. The calculator accounts for evaporation, coolant loss and refractometer correction, helping you maintain stable concentration, extend coolant life and protect your tooling.
For detailed explanations and formulas, see the full article.
For a full explanation of concentration formulas, refractometer correction and top up ratios, see the complete coolant top up article.
Tip: Working with coolant daily? Reduce foaming, stabilize pH and extend sump life with CNC grade coolants designed for industrial machining:
CNC coolant, also called metalworking fluid, is designed for chip evacuation, lubrication and heat removal during machining. Automotive coolant is designed for engine thermal management. They are not interchangeable.
This calculator applies only to metalworking fluids.
