Float

Double-precision floating-point scalar type

Audience: Programmer

The Float scalar type represents signed double-precision fractional values as specified by IEEE 754.

Format

• 64-bit IEEE 754 floating-point

• Approximately 15-17 decimal digits of precision

• Range: ±1.7976931348623157E+308

• Supports scientific notation

Usage

type ItemMovement {
  quantity: Float!
  unitPrice: Float
  totalValue: Float
}

mutation {
  createItemMovement(input: {
    quantity: 10.5
    unitPrice: 29.99
  }) {
    itemMovement {
      totalValue  # Returns Float
    }
  }
}

Common Float Fields

• Quantities with decimals

• Prices and monetary values

• Percentages and ratios

• Coordinates (latitude/longitude)

• Measurements and dimensions

Precision Considerations

# Be aware of floating-point precision
mutation {
  updatePrice(
    value: 0.1 + 0.2  # May not equal exactly 0.3
  )
}

Best Practices

1. Use for scientific calculations

2. Consider fixed-point for money (or use Int for cents)

3. Be aware of precision limitations

4. Use rounding when displaying to users

See Also

• Int - Whole number values

• String - For arbitrary precision decimals