Quickly calculate the ideal antifreeze-to-water ratio for your vehicle based on climate and current mix. Helps prevent freezing in winter and overheating in summer.
A 50/50 mix of antifreeze and distilled water is the standard recommendation for most climates, offering freeze protection down to -34°F and boil protection up to 265°F.
For extremely cold climates, a stronger antifreeze mix (60/40 or 70/30) may be needed. In hot areas, a slightly higher water content can improve heat transfer. This tool helps you adjust safely.
Distilled water is always recommended to avoid minerals that can corrode your cooling system. This tool assumes you’re using distilled water.
Different coolants (ethylene glycol vs. propylene glycol) have different freeze and boil points. Our calculator accounts for this so you can select the right mix.
You can use an inexpensive antifreeze tester (hydrometer or refractometer) to determine the freeze point of your existing coolant. Input that into the calculator for custom recommendations.
Yes, this tool applies to nearly all gasoline and diesel vehicles with liquid cooling systems. Always consult your vehicle manual for manufacturer-specific recommendations.