What size lift chair do you need?

The four measurements that size a lift chair

1. Seat-to-floor height. Measure from the back of the knee to the floor with the feet flat and shoes on. The chair's seat height should match this within about an inch, so the feet rest flat rather than dangling or forcing the knees up.
2. Seat depth. Measure from the back of the hips to the back of the knee while seated upright. The chair's seat depth should be one to two inches less, so there is a gap behind the knee and no pressure on the back of the calf.
3. Seat width. Measure hip to hip at the widest point while seated, and add two inches for clothing and movement. Too wide and the armrests are out of reach when pushing up.
4. Back height. Measure from the seat to the top of the shoulders. The backrest should reach at least to the shoulders, and to the top of the head if the chair will be slept in.

What goes wrong at each size

Weight capacity is a hard limit, not a guideline. It covers the motor and the frame together, and exceeding it is how a lift mechanism fails under load.

Sizing for a shorter person

The common mistake for a shorter user is a chair whose seat is too high and too deep. The feet end up dangling, the front edge of the seat presses behind the knees, and standing up becomes harder rather than easier - which defeats the point of the chair.

Look specifically for a petite or small model rather than adjusting a standard chair with cushions. Padding the seat raises it further, which is the opposite of what is needed.

If a petite chair is not available in the style wanted, chair risers are the wrong fix here too. Keep looking for the right chair, or check whether the manufacturer offers a shorter-seat option in the same range.

Sizing for a taller or heavier person

For a taller user the critical measurements are back height and seat depth. A backrest that stops at mid-shoulder is uncomfortable immediately and useless for sleeping, and a shallow seat leaves the thighs unsupported with the knees hanging past the front edge.

For a heavier user, weight capacity governs everything else. Chairs are usually sold in bands - commonly around 300 lb for standard models and 375 to 500 lb or more for heavy-duty ranges - and the frame, motor and lift geometry are all built to that figure.

Heavy-duty chairs are also wider, which is good for comfort and can be bad for standing up: if the armrests are too far apart to push on, the lift does more of the work and the person does less, which gradually costs them strength. Width still needs to be measured rather than maximized.

Two-position, three-position or infinite recline?

• Two-position chairs recline to about 45 degrees. Fine for reading and television, not for sleeping.
• Three-position chairs recline close to flat, which is what most people want if the chair will be slept in occasionally.
• Infinite-position chairs have separate motors for the back and footrest, so the legs can be raised with the back upright - the setting that matters for swollen ankles.
• More motors means more cost and more to go wrong. Buy the configuration the person will actually use.
• Check that the hand control has large, distinguishable buttons. A small flat remote is a daily irritation for stiff fingers.

Before you order

• Measure the doorway and the turn into the room. Lift chairs are heavy and arrive in large boxes.
• Check how much clearance the chair needs behind it - many need several inches to recline, though wall-hugger designs need less.
• Confirm there is a power outlet within reach, and ask about a battery backup for power cuts.
• Ask whether delivery includes setup and removal of packaging. Assembly is not a one-person job.
• Ask your insurance whether any part of the cost is covered with a prescription - the lift mechanism is sometimes treated differently from the chair.

The details that decide whether the chair is lived with

Once the four measurements are settled, the remaining choices are about daily life rather than fit, and they are where regret usually comes from. The first is the hand control. A small flat wand with identical buttons is hard to use in a hurry and nearly impossible in the dark; a control with large, differently shaped buttons and a cord long enough to reach the floor is worth asking about by name.

The second is the fabric. Leather and vinyl wipe clean, which matters if there are any continence concerns, but they are cold in winter, warm in summer, and slippery, which makes staying put in the chair harder. A textured fabric grips better and is more forgiving to sit on for hours, at the cost of being harder to clean. Many ranges offer a performance fabric that splits the difference, and it is usually the right answer.

The third is the pocket. A side pocket deep enough for a remote control, a phone and a pair of glasses removes the main reason someone reaches over the side of a chair, which is one of the most common ways people end up on the floor. If the chair does not have one, an over-arm caddy costs very little and does the same job.

Finally, ask what happens in a power cut. Most lift chairs include a battery backup that will complete one cycle so nobody is stranded reclined, but the batteries are a consumable and are often flat by the time they are needed. Check they are present, and change them yearly on the same day the smoke alarm batteries are done.