Your sweater should look something like this at this point:
Take the measurement of your arm and add around 4 inches [10cm] ease to it (I am adding 4 inches [10cm] to my sleeve, when my arm over my sleeve is 12 inches [30cm], add a little more if you are knitting a larger sweater or less if you are knitting a smaller sweater).
Measurement of arm = A
Ease = B
Gauge = C
Number of stitches to pick up for sleeves = D
(A + B) * C = D
With right side of piece facing you, pick up and knit the number of stitches you just worked out in the previous step along the arm rise, from right (so that your first row will be a wrong side row).
Knit to approximately 2.5 inches [6cm] after the middle of the arm rise, turn and make a yarn over over the right needle (you will knit this yarn over together with the next stitch on the next row). Knit for approximately 5 inches [12cm], turn working yarn over as for last row, work to end of previous row, knit yo with next stitch, work 3 more stitches, turn with yarn over as for previous row.
Continue with short rows, working 3 stitches further each row and using short row yarn overs to close the holes until all the stitches you picked up are worked.
Work straight until sleeve is desired length, bind off.
A = 12 inches [30cm]
B = 4 inches [10cm]
C = 1.75 stitches / inch [0.7 stitches / cm]
(12 inches [30cm] + 4 inches [10cm]) x 1.75 stitches / inch [0.7 stitches / cm] = D
16 inches [40cm] x 1.75 stitches / inch [0.7 stitches / cm] = 28 sts
Pick up and knit 28 sts.
K18, turn, yo, k8, turn, yo, k11, turn, yo . . .
Work until all stitches are picked up, work until sleeves are desired length.
At this point my sweater looks like this:
I didn’t want to make you wait.