UKismetMathLibrary::Conv_BoolToDouble

function Engine Blueprint Since 5.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticBlueprintPureBlueprintAutocast

Description

Converts a boolean to a double: false returns 0.0, true returns 1.0. Useful for blending, scaling, or enabling smooth transitions driven by a boolean flag.

Caveats & Gotchas

• Returns exactly 0.0 or 1.0 — not a continuous value. For smooth transitions (0.0→1.0 over time) use a timeline or FMath::FInterpTo driven by the bool, not just a single conversion.
• The header names this 'To Float (Boolean)' in its DisplayName, reflecting its pre-UE5 history as a float return. The actual return type is double in UE5+.

Signature

static UE_INL_API double Conv_BoolToDouble(bool InBool)

Parameters

Name	Type	Description	Default
InBool	bool	The boolean value to convert.	—

Return Type

double

Example

Scale damage by an invulnerability flag C++

bool bIsInvulnerable = GetIsInvulnerable();
double DamageScale = 1.0 - UKismetMathLibrary::Conv_BoolToDouble(bIsInvulnerable);
// DamageScale == 0.0 when invulnerable, 1.0 otherwise
ApplyDamage(BaseDamage * DamageScale);

Version History

Introduced in: 5.0

Version	Status	Notes
5.6	stable	—

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