Tabellab
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In Excel: make the marks easy to type

  • Select the grid B2:E15, Data > Data Validation > List, Source: x,-. Now every cell offers a drop-down with the two allowed marks.
  • Prefer a real tick? Use Insert > Checkbox (Microsoft 365): a ticked box is TRUE, so count with =COUNTIF(B2:B15,TRUE).
  • Add the next weeks by inserting rows above the Days done row: the COUNTIF ranges grow automatically.
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