The SparkPeople program does have the ability to determine calorie needs for people who get very little activity. However, we encourage you to meet with the following professionals to get the most reliable assessment possible for your needs:
If your activity is limited, set a realistic weight loss goal knowing that you won't be able to lose weight as quickly as someone who burns a lot more calories through daily activity and exercise. For someone who cannot increase their physical activity due to medical reasons, your calorie deficit for weight loss must come from decreasing your caloric intake alone. People in this situation will also lose weight more slowly than people who can cut calories through both diet and exercise.
Check out the following SparkPeople Resources for more information:
Strength Training with a Disability
How to Use an Arm Ergometer
Video: Seated Resistance Band Workout Video
SparkTeam: People with Disabilities & Handicaps