Fluid & Quantities

Coolant / Brake Fluid / ATF

Convert coolant, brake fluid, and ATF volumes.

Coolant / Brake Fluid / ATF Conversion

Fluid Ounces (fl oz):

Milliliters (ml):

Liters (L):

fl oz = ml ÷ 29.5735

ml = fl oz × 29.5735

L = fl oz × 0.0295735

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About this tool

The BuildLockr coolant capacity calculator simplifies the conversion of cooling system fluid volumes. Use this tool to calculate radiator and engine block capacities between liters, quarts, gallons, and fluid ounces. Whether you are flushing your car's cooling system, mixing antifreeze ratios, or refilling automatic transmission fluid (ATF), this conversion tool handles the calculations. This helps enthusiasts maintain optimal thermal regulation by ensuring the correct coolant volumes are utilized.

How to Calculate Radiator Coolant Volume

Common Fluid Capacities:

• Coolant System: 8-16 fl oz (240-475 ml) for top-off
• Brake Fluid: 0.5-1.0 fl oz (15-30 ml) for top-off
• ATF Top-off: 1-2 fl oz (30-60 ml) typical
• Power Steering: 1-3 fl oz (30-90 ml) for top-off
• Windshield Washer: 32-128 fl oz (1-4 L) reservoir
• Differential Oil: 16-48 fl oz (475-1420 ml)

Common Coolant Capacity Questions

What is the ideal water-to-antifreeze ratio?

A 50/50 mix is ideal for most climates, providing freezing protection down to -34°F and boiling protection up to 265°F.

How do you bleed air from a cooling system?

Use a spill-free funnel at the highest point of the system, start the engine with the heater on high, and let it run until all air bubbles escape.

What fluids can be converted using this tool?

This tool converts volume units for engine coolant, automatic transmission fluid, power steering fluid, and brake fluid.