I built the dolls house chair in these instructions to a scale of 1:12, so I will give measurements for this scale of chair. You can easily scale these chairs up or down, by working out your design in a sketch and scaling the standard measurements on the first page of this tutorial to suit the scale of chair you want to build.
Materials Used to Build the Chair
For my small kitchen or desk chair, I used 1/8 by 1/4 basswood strips for the back legs of the chair, 1/8 inch square stock for front legs and the seat supports, 1/8 by 3/8 inch stock for the bac support, 3/32 by 1 1/2 inch stock for the seat and 3/32 inch square stock for the lower leg rails. If you don't want to buy a lot of extra wood, you can make straight instead of angled back legs and front legs for kitchen chairs from long handled wooden match sticks. Use what is easiest for you to find. Do not use soft woods such as Balsa.
To Measure and Cut the Chair Legs
Cut your 1/8 by 1/4 inch stock to the length you want for the overall height of your chair. I cut my back legs to 2 3/4 inches long for a fairly short backed chair. Use a miter box to make sure your cuts are square across the bottoms and tops of the legs. Cut your front legs from the 1/8 inch square stock to the height you want your chair seat to be, minus the thickness of your seat. I cut my front legs to 1 3/8 inches long, so the top of my seat will be at the equivalent of 18 inches in height.(1 1/2 inches in 1:12 scale)
Mark the Angles for the Angled Back and Legs
To make a simple angled back on my chair, and back legs which angle back from the chair seat, I first marked where the top of the chair seat will cross the back legs (1 1/2 inches from the bottom of the leg). Next I made a mark 1/8 above this, and another 1/8 below this. This section of the back of the chair will stay square to make it easier to glue the seat supports to the legs. My final marks were made 1/8 inch in from the widest edge at the top and bottom of the leg (see photo). If you are using different sized wood for a different scale adjust your marks to represent the thickness of your legs and chair seat.
Draw the Leg Outlines
To mark the cutting lines for the legs, see the photo above. the leg edge which joins the seat (front of the back leg) is drawn from the 1/8 inch line above the seat back to the 1/8 inch mark in from the edge of the leg. A similar line is drawn for the bottom of the leg. The back of the leg is angled from the back edge of the wood strip, to the point 1/8 inch from the back edge of the strip where the top of hte seat line will be (see photo). The back edge of the leg is an angle, rather than an angle, a flat face, and an angle, the way the front face of the leg is drawn.