Unofficial RTX HDR Calculator

Display Parameters

Peak Brightness (nits)

Enter the maximum brightness of your monitor (e.g., 400, 1000, 2500).

Calibration Style

Choose the standard based on your room lighting and preference.

Cinema (Recommended): Caps Paper White at 203 nits. Best for dim/dark rooms. Keeps text comfortable while maximizing dynamic range.

Vivid: Scales average brightness up with your monitor's power. Best for bright rooms. Makes the image punchier but may strain eyes.

Target Gamma

Select your preferred shadow depth.

Game Overlay Settings

Peak Brightness --

Middle Grey Derived from BT.2408

Contrast --

Saturation -25

Profile Inspector (HEX) 32-BIT UNSIGNED

Note: Contrast values below include the +100 offset required by NPI. Use these values directly without additional adjustment.

TrueHDR - Peak Brightness 0x00DD48FC

0x00000000

TrueHDR - Middle Grey 0x00DD48FD

0x00000000

TrueHDR - Contrast 0x00DD48FE

0x00000000

TrueHDR - Saturation 0x00DD48FF

0xFFFFFFE7

Windows 11 Setup Tips

Disable Auto HDR: Prevent double-tone-mapping.
Settings > System > Display > HDR > Auto HDR [OFF]
Disable ACM: Ensure "Automatic Color Management" is off.
Settings > System > Display > Advanced Display > Automatically manage color [OFF]
Apply In-Game: Use the overlay while the game is running.
Press Alt+Z > Game Filter > RTX HDR

Disclaimer: This is an open-source, fan-made project.
"NVIDIA", "GeForce", "RTX", and the NVIDIA logo are trademarks and/or registered trademarks of NVIDIA Corporation.
This tool is not endorsed by or affiliated with NVIDIA Corporation.
v1.5.1 (NPI Offset Clarification)