The following is a table of Allied shipping losses in the Battle of the Atlantic during World War II. All shipping losses are in Gross Registered Tonnage (GRT).
Month, yearImports to AlliesSunk byU-boatSunk byaircraftSunk bywarship or raiderSunk byminesTotal Alliedshipping sunkGermansubmarines lost39-09Sep. '3932970701538790505129537158930239-10Oct. '39357613513480703205829490166865539-11Nov. '394408689515890172212095853311139-12Dec. '3944666648088129492250682712106336140-01Jan. '40484704411126323693077116134956140-02Feb. '404348820169566853176154740172180640-03Mar. '40497052562781869403505171475140-04Apr. '405336917324671340953581979951083540-05May '40536287355580158348689347716220127140-06Jun. '402841131051936185786087040-07Jul. '40195825701938079633598240-08Aug. '40267618532836335011433340-09Sep. '4029533556328962888269140-10Oct. '4035240787523213432548140-11Nov. '401466136643812367146672240-12Dec. '40212590148905572854331041-01Jan. '412651399126782785978079617107302601041-02Feb. '412621795196783893058909616507372205041-03Mar. '41286412124302011331413890623585474879541-04Apr. '4126205312493753234549157924888616469241-05May '4134662043254921463021500223194486796141-06Jun. '413594684310143614141775915326389316441-07Jul. '41376572494209927557928583109276041-08Aug. '4140024508031023862248971400125550441-09Sep. '414267134202820408122291014948259866241-10Oct. '41420322415655435222330519737191776241-11Nov. '413336789621962301517715171485211541-12Dec. '413735419124070728506661638532035811042-01Jan. '4232735757086327510079342-02Feb. '4247645113374607242242-03Mar. '42537980557062561416862642-04Apr. '424316648292413118815002342-05May. '42607247590411936318795442-06Jun. '42700235547694847419936342-07Jul. '42476065743135435889051142-08Aug. '4254441060532505160942-09Sep. '42485413575262438801042-10Oct. '426194175686757651571642-11Nov. '4272916053868191789921342-12Dec. '423308164853123121618443-01Jan. '4320312825503704018475643-02Feb. '43359328754858341531943-03Mar. '436273776512808841543-04Apr. '4332794330341742119611543-05May. '4326485320942015684143-06Jun. '439775360831765543341743-07Jul. '432421451060057176723743-08Aug. '4386579141330192543-09Sep. '4311884122905997743961043-10Oct. '4397407226800197742643-11Nov. '436658562452853866661943-12Dec. '43869677547106086844-01Jan. '449227824237642071761644-02Feb. '449292321616208502044-03Mar. '441429440784071762544-04Apr. '446214919755002144-05May. '44244242873002444-06Jun. '445787590081812246542544-07Jul. '44633510721981142444-08Aug. '44987290717671943544-09Sep. '44433680014372244-10Oct. '4471760044921344-11Nov. '4429592724711410844-12Dec. '4458518359200356121545-01Jan. '455698871762365163681445-02Feb. '456523371773899180762145-03Mar. '456507703968360643345-04Apr. '457243922822087335345-05May. '451143971760035
Total losses by U-boats: 14,668,785
References Runyan, Timothy J.; Copes, Jan M. To Die Gallantly: The Battle of the Atlantic, pp. 85, 86 Burns, R. W.;Warwick, K.; Rees, D. Radar Development to 1945, p. 260 Hickam, Homer H. Torpedo Junction: U-Boat War Off America's East Coast, 1942, p. 2