A carpet laying tool (1; 201; 301; 401; 401'; 401") adapted for laying floor coverings for bath rooms, kitchens and the like, the carpet laying tool (1; 201; 301; 401, 401', 401 ") comprising: - a first portion (3; 8; 11; 203; 208; 211; 303; 308; 311; 403; 408; 411) comprising a planar surface with a first (4; 5; 9; 204; 205; 209; 304; 305; 309; 404; 405; 409) and a second edge (4; 5; 9; 204; 205; 209; 304; 305; 309; 404; 405; 409) which are each substantially straight, the first and the second edge being arranged with a first edge tangent intersecting a second edge tangent at a right angle at a base corner (2; 202; 302) of the carpet laying tool (1; 201; 301; 401; 401'; 401") characterized in that said tool further comprises - at least a first triangular guiding portion (8; 11; 208; 211; 308; 311; 408; 411) comprising a planar surface, arranged perpendicularly to the first portion (3; 8; 11; 203; 208; 211; 303; 308; 311; 403; 408; 411) and extending from the base corner (2; 202; 302) along the first edge of the first portion, and the at least a first triangular guiding portion (8; 11; 208; 211; 308; 311; 408; 411) comprising a substantially right angle which is comprised in the base corner (2; 202; 302); and comprising a hypotenuse edge (10; 12; 210; 212; 310; 312) arranged at a predetermined angle to the planar surface of the first portion, wherein the hypotenuse edge (10; 12; 210; 212; 310; 312) is adapted to provide a carpet seam cutting guide for a cutting tool, wherein the first portion is a second triangular guiding portion (8; 11; 208; 211; 308; 311; 408; 411) and the second triangular guiding portion comprising a substantially right angle which is comprised in the base corner (2; 202; 302), and comprising a hypotenuse edge (10; 12; 210; 212; 310; 312) arranged at a second predetermined angle to the planar surface of the at least a first triangular guiding portion (8; 11; 208; 211; 308; 311; 408; 411), wherein the hypotenuse edge (10; 12; 210; 212; 310; 312) is adapted to provide a carpet seam cutting guide for a cutting tool. - a first portion (3; 8; 11; 203; 208; 211; 303; 308; 311; 403; 408; 411) comprising a planar surface with a first (4; 5; 9; 204; 205; 209; 304; 305; 309; 404; 405; 409) and a second edge (4; 5; 9; 204; 205; 209; 304; 305; 309; 404; 405; 409) which are each substantially straight, the first and the second edge being arranged with a first edge tangent intersecting a second edge tangent at a right angle at a base corner (2; 202; 302) of the carpet laying tool (1; 201; 301; 401; 401'; 401") - at least a first triangular guiding portion (8; 11; 208; 211; 308; 311; 408; 411) comprising a planar surface, arranged perpendicularly to the first portion (3; 8; 11; 203; 208; 211; 303; 308; 311; 403; 408; 411) and extending from the base corner (2; 202; 302) along the first edge of the first portion, and the at least a first triangular guiding portion (8; 11; 208; 211; 308; 311; 408; 411) comprising a substantially right angle which is comprised in the base corner (2; 202; 302); and comprising a hypotenuse edge (10; 12; 210; 212; 310; 312) arranged at a predetermined angle to the planar surface of the first portion, wherein the hypotenuse edge (10; 12; 210; 212; 310; 312) is adapted to provide a carpet seam cutting guide for a cutting tool, wherein the first portion is a second triangular guiding portion (8; 11; 208; 211; 308; 311; 408; 411) and the second triangular guiding portion comprising a substantially right angle which is comprised in the base corner (2; 202; 302), and comprising a hypotenuse edge (10; 12; 210; 212; 310; 312) arranged at a second predetermined angle to the planar surface of the at least a first triangular guiding portion (8; 11; 208; 211; 308; 311; 408; 411), wherein the hypotenuse edge (10; 12; 210; 212; 310; 312) is adapted to provide a carpet seam cutting guide for a cutting tool.