Metric to Flotation Tire Converter

To convert metric to flotation, enter your metric tire dimensions (section width, aspect ratio, and rim diameter). The calculator will compute the equivalent flotation size showing overall diameter, section width, and rim diameter in inches.

Metric sizing uses millimeters for width and percentage for aspect ratio (e.g., 235/75R15), while flotation sizing uses inches for overall diameter and width (e.g., 31x10.5R15). Flotation sizes are commonly used for off-road and truck tires.

Conversions are mathematically accurate, but actual tire dimensions can vary by manufacturer and model by up to 3%. Always verify specifications with the tire manufacturer for critical applications.

In metric sizing (235/75R15): 235 is section width in mm, 75 is aspect ratio (sidewall height as % of width), R indicates radial construction, and 15 is rim diameter in inches. In flotation (31x10.5R15): 31 is overall diameter, 10.5 is section width, and 15 is rim diameter, all in inches.

Converted sizes give you equivalent dimensions, but you should verify load rating, speed rating, and vehicle compatibility before purchasing. Consult your vehicle manual or tire professional for safety requirements.

Converting helps when shopping for tires, comparing sizes from different manufacturers, or when switching between metric and flotation tire types for off-road applications or specific vehicle requirements.

For metric tires, sidewall height = (section width in mm × aspect ratio) ÷ 100. For flotation tires, sidewall height = (overall diameter - rim diameter) ÷ 2. The calculator performs these calculations automatically.

Tire revolutions per mile depend on the overall diameter - larger diameter tires complete fewer revolutions per mile. This affects speedometer accuracy and odometer readings when changing tire sizes.