| Navy | The Royal Navy |
| Type | Corvette |
| Class | Flower |
| Pennant | K 28 |
| Built by | Harland & Wolff Ltd. (Belfast, Northern Ireland) |
| Ordered | 19 Sep 1939 |
| Laid down | 30 Oct 1939 |
| Launched | 21 Mar 1940 |
| Commissioned | 6 May 1940 |
| End service | 12 Mar 1942 |
| Loss position | |
| History | Acquired by the USN on 12 March 1942 Commanding Officer: |
| Career notes | To the United States Navy as USS Ready |
Commands listed for HMS Calendula (K 28)
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| Commander | From | To | |
| 1 | Lt.Cdr. Alan Douglas Bruford, RNVR | 9 Apr 1940 | ??? |
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Noteable events involving Calendula include:
19 Jun 1940
HMS Calendula (Lt.Cdr. A.D. Bruford, RNVR) picks up 23 survivors from the Norwegian merchant Tudor that was torpedoed and sunk by the German submarine U-48 north-west of Cape Finisterre in position 45º10'N, 11º50'W.
3 Jul 1940
HMRT Marauder (Lt. W.J. Hammond, RNR) takes the damaged Dutch merchant Amstelland in tow to Falmouth, where they arrived on 5 July. The Amstelland was torpedoed and damaged on 1 July by the German submarine U-65 about 380 nautical miles southwest of Lands End in position 47º53'N, 13º23'W. During the tow the ships were escorted by the British corvette HMS Calendula (Lt.Cdr. A.D. Bruford, RNVR).