Antifreeze / Coolant Freezing-Point Calculator
Enter an antifreeze concentration or a target freezing point to convert between them and get the recommended antifreeze:water mix ratio.
🌡️ Input
Pick a region to auto-fill its typical winter low temperature.
The lowest temperature you want to stay protected against
Passenger cars are usually 6–8 L. Check your manual.
Recommended mix by situation
- 🚙 Most of Korea: antifreeze:water 5:5 (~50%, -37°C)
- 🏔️ Mountainous / extreme cold: 6:4 – 7:3 (~60%, around -50°C)
⚠️ Above 60%, the freezing point actually rises again and heat transfer worsens.
📊 Result
Recommended concentration
40%
Antifreeze : Water ratio
4 : 6
Based on 100% concentrate
Protected to
-24.3℃
Target (regional low)
-15℃
Required volume (7 L)
Antifreeze concentrate
2.8 L
Water (distilled/soft)
4.2 L
Below the regional low, but the safety margin (~10°C) is thin. Consider a slightly higher concentration.
Data sources
- 📈 Freezing curve: ASHRAE Handbook · ethylene glycol maker data (public approximation)
- 📍 Regional lows: KMA regional average minimum temperatures (approximate)
※ All figures are reference estimates. Verify concentration with a refractometer and your vehicle manual / a shop.
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