From Draftsperson.net
FROM

TO

MULTIPLY
BY

sq.
millimetres

sq.
inches

0.00155

sq.
inches

sq.
millimetres

645.16

sq.
centimetres

sq.
inches

0.155

sq.
inches

sq.
centimetres

6.452

sq.
metres

sq.
feet

10.76

sq.
feet

sq.
metres

0.0929

sq.
metres

sq.
yards

1.196

sq.
yards

sq.
metres

0.835

sq.
kilometres

sq.
miles

0.3861

sq.
miles

sq.
kilometres

2.59

hectacres

acres

2.471

acres

hectacres

0.4047
