Those who study chairs suggest the seat tilt back by 5 degrees, and the angle of the back in relation to the seat be 105 degrees (a greater tilt is hard on the neck).

The height of the seat is chosen so that a short person's legs won't dangle. A height that is too low makes it difficult for a tall person to get up. Because children of the same age vary so greatly in size, it's a good idea to make seating for them adjustable.

Suggested chair dimensions in inches,
for sitters of various ages
  height of seat pan
at the leading edge
seat pan depth back height seat width
Kindergarten 11 14 10  
Grades 1 – 3 13 14 11  
Grades 4 – 6 13 14 13  
Grades 7 – 9 15 15 15  
Grade 10 - adult 17 17 20 19

for further reading

T. Lauder Brunton.
On the Science of Easy Chairs...On Posture and its Indications.
London: Macmillan and Co., 1892

The first essay originally appeared as an article in Nature, October 17, 1878. The chair described as ideal by Brunton is in most respects identical to that designed by NASA.

Galen Cranz.
The Chair: Rethinking Culture, Body and Design.
W. W. Norton, 2000.

Design Museum.
Fifty Chairs that Changed the World.
Conran Octopus, 2010.

Design Museum.
How to Design a Chair.
Conran Octopus, 2010.

Charlotte Fiell.
1000 Chairs. Taschen 25 edition.
Taschen, 2005.

Ray Menachandra and Craig Nutt.
500 Chairs: Celebrating Traditional & Innovative Designs.
Lark Crafts, 2008.

Jonathan Olivares.
A Taxonomy of Office Chairs.
Phaidon, 2011.

Peter Opsvik.
Rethinking Sitting.
W. W. Norton, 2009.

Jenny Pynt and Joy Higgs.
A History of Seating, 3000 BC to 2000 AD: Function versus Aesthetics.
Cambria Press, 2010.


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