Desk Height Calculator For An Ergonomic Office Recommended Ranges: * Chair height: 41 - 45.5 cm. Your thighs and feet should be parallel to the floor (thighs and lower legs forming 90-110° angle) * Desk height: 63.5 - 70 cm. Your elbows and underarms should lie straight on the table. Make sure there is a 90-110° angle at the elbow. * Monitor height: 118.5 - 122.5 cm.