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Directory / Compare / USP45 Compact (V1) vs USP9 Compact (V1)
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Heckler & Koch USP45 Compact (V1) vs Heckler & Koch USP9 Compact (V1)

Heckler & Koch publishes both as USP models. They are chambered differently — the USP45 Compact (V1) in .45 ACP, the USP9 Compact (V1) in 9x19mm Parabellum — so nothing below compares their cartridges. The USP45 Compact (V1) is 7 mm / 0.28 in longer overall; its barrel is 5 mm / 0.2 in longer; the USP9 Compact (V1) lists 5 rounds more of standard capacity. One field is not comparable — overall height — because the makers publish them on different measurement bases.

Computed differences06
FieldDifference
Overall length7 mm / 0.28 in (USP45 Compact (V1) is greater)
Overall widthIdentical figures
Overall heightNot comparable — USP45 Compact (V1): no basis stated; USP9 Compact (V1): HK's metric cell is blank in this caliber's row, so the millimetre figure is converted from its published 5.00 in
Barrel length5 mm / 0.2 in (USP45 Compact (V1) is greater)
WeightNot published by both
Standard capacity5 rounds (USP9 Compact (V1) is greater)
How these differences are computed: each is the arithmetic difference between the two published figures, and it is only shown where both sources measured the field the same way. Where a source states a measurement basis the other does not match, the row says so instead of subtracting — figures on different bases are not comparable even when the numbers sit side by side. Differences marked ≈ involve at least one figure this directory converted between unit systems, so the difference is no more precise than that conversion.
Size, to scale
To-scale size envelopes: USP45 Compact (V1) vs USP9 Compact (V1)Boxes drawn from published overall dimensions at one scale, aligned at the rear. Heckler & Koch USP45 Compact (V1): 180 mm long, 35 mm wide; Heckler & Koch USP9 Compact (V1): 173 mm long, 35 mm wide.050 mm100 mm150 mmLengthUSP45 Compact (V1) is 7 mm longerTop · length × width
  • Heckler & Koch USP45 Compact (V1)Length 180 mm / 7.09 inWidth 35 mm / 1.38 in
  • Heckler & Koch USP9 Compact (V1)Length 173 mm / 6.81 inWidth 35 mm / 1.38 in
Boxes, not silhouettes: makers publish a pistol's overall envelope, not its shape, so that is all this draws. Every box is aligned at the rear and drawn at one fixed scale, the same on every page of this site, so drawings compare across pages. It is not life-size on your screen. Heights are not drawn because the heights are not published on one stated basis (USP45 Compact (V1): no basis stated; USP9 Compact (V1): HK's metric cell is blank in this caliber's row, so the millimetre figure is converted from its published 5.00 in).
Published fields, side by side
FieldUSP45 Compact (V1)USP9 Compact (V1)
ManufacturerHeckler & KochHeckler & Koch
Chambering.45 ACP9x19mm Parabellum
Overall dimensions180 × 35 × 128 mm / 7.09 × 1.38 × 5.04 in173 × 35 × ≈127 mm / 6.81 × 1.38 × 5 in (height: HK's metric cell is blank in this caliber's row, so the millimetre figure is converted from its published 5.00 in)
Barrel length96 mm / 3.78 in91 mm / 3.58 in
Standard capacity8 rounds13 rounds
Trigger pull51 N / ≈11.47 lb (double-action); 20 N / ≈4.5 lb (single-action)51 N / ≈11.47 lb (double-action); 20 N / ≈4.5 lb (single-action)
VerificationSource verified 2026-08-13Source verified 2026-08-13
Full records, with every value beside the source it came from: Heckler & Koch USP45 Compact (V1) · Heckler & Koch USP9 Compact (V1). More from these makers: Heckler & Koch.
Reference information only. Not legal, purchasing, training, carry, storage, or assembly advice. Manufacturer technical data are rounded and may change without notice. Spotted an error? Submit a correction.