UKismetMathLibrary::Conv_ByteToDouble

function Engine Blueprint Since 5.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticUFUNCTIONBlueprintPure

Description

Widens a uint8 byte to a double-precision float. Tagged BlueprintAutocast so Blueprint will insert this node automatically when a Byte pin is connected to a Float/Double input.

Caveats & Gotchas

• In UE 5.0+, Blueprint's native float type became double-precision. This function targets the double (was float pre-5.0) overload. Projects migrated from 4.x may have stale Blueprint nodes referencing the old float variant — rebuild the node if you see type mismatch warnings.
• The conversion is lossless for all 256 uint8 values, but the result pin in Blueprint shows as "Float" regardless of the internal double precision. This can mislead designers into thinking precision was lost when it was not.

Signature

static UE_INL_API double Conv_ByteToDouble(uint8 InByte);

Parameters

Name	Type	Description	Default
InByte	uint8	The byte value (0–255) to convert.	—

Return Type

double

Example

Normalize a health byte to 0-1 range C++

uint8 HealthByte = GetHealthAsByte();
double Normalized = UKismetMathLibrary::Conv_ByteToDouble(HealthByte) / 255.0;
HealthBar->SetPercent(static_cast<float>(Normalized));

Version History

Introduced in: 5.0

Version	Status	Notes
5.6	stable	—

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