In this paper, we present ScaleHP, a unified framework that explicitly represents per-instance metric scale to resolve the coupled errors in calibrated camera-space hand pose estimation. Under the common root-relative-to-global paradigm, camera-space accuracy depends jointly on relative geometry, root localization, and their scale-dependent composition. ScaleHP treats scale as the shared interface among these terms rather than optimizing them in isolation. Its metric-aware 2D-3D Transformer decoder introduces a dedicated scale token that exchanges information with sparse, semantically indexed 2D/3D joint queries, allowing global metric reasoning and local joint geometry to mutually refine one another. A parameter-free calibrated module then recovers root translation from the predicted unit-scale joints, metric scale, and known camera intrinsics. ScaleHP demonstrates state-of-the-art CS-MPJPE on FreiHand (35.8 mm) and, under benchmark-specific training protocols, state-of-the-art PA-MPJPE on FreiHand, DexYCB, and HO3Dv3 (5.0/4.6/5.9 mm), showing that improved global metric localization is attained together with improved local articulation. Ablations further show that scale-pose interaction improves both camera-space accuracy and relative depth geometry.

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