Under-Desk Footrest: Do You Need One, and How High to Go?

The common mismatch starts at the work surface: raising a chair to reach a fixed-height keyboard can leave a smaller person suspended above the floor. Check the whole arrangement together.

The free fix comes first: an adjustable desk may let you lower the keyboard and chair together. A footrest earns its place when the work surface stays too high for your feet to reach the floor comfortably.

The three-step fitting check

Do this at your actual keyboard, wearing the footwear you normally work in. A measurement taken while perching on the chair edge will describe the wrong setup.

1. Fit the chair to the keyboard. Sit back with your back supported. Adjust the chair so your shoulders relax, elbows stay close, and forearms are roughly parallel to the floor when typing. Keep wrists in line with your forearms. If the desk adjusts, change its height too. OSHA's neutral-position guidance describes the target; it does not prescribe one chair height for everyone.
2. Check what happens below the desk. Are both soles supported without pointing your toes downward or sliding forward? Are your thighs supported without the seat edge pressing into the backs of your knees? If the feet float, estimate the vertical gap below your heels. Treat that as a starting point for shopping, rather than an exact required platform height.
3. Check the height under load. With the proposed support in place, sit back and put both feet on it. Aim for supported soles, thighs generally level, and knees around hip height. Recheck your keyboard position and knee clearance. An angled surface and compressible foam can fit differently from their advertised maximum height.

A support that is too low leaves you reaching for it. One that is too high lifts your knees and changes how your thighs meet the seat. OSHA's chair guidance recommends a stable footrest when lowering the chair would make the workstation unsuitable. That is a fitting decision, not a universal recommendation to add another accessory.

Match your situation to the actual fix

This is the decision point. Find the problem before choosing a product.

For the rest of the workstation, follow our seated posture guide. If moving the chair changes your screen position, revisit monitor placement too.

Choose adjustability before chasing features

A foam wedge gives your feet a cushioned surface, but its usable height changes with pressure. An adjustable platform offers more height or angle choices; check the manufacturer's actual range against your estimated gap. A rocker allows movement, but it still needs to support your feet comfortably in its resting position.

A suspended hammock is a different arrangement: the support depends on its mounting points and tension. Check desk compatibility, leg clearance and whether both feet stay supported where you sit. Do not assume every product called a footrest can solve the same height mismatch.

Measure the useful surface: compare the support available where your heels and forefeet will land. The tallest point on a sloped footrest is not the height beneath your whole foot.

Four catalog options, with different jobs

The comparison above includes one seated footrest and three conditional alternatives. The alternatives make sense only when they match the problem you found.

• For unsupported feet: the ErgoFoam Adjustable Foot Rest has a removable base. Its manufacturer lists nominal heights of 3.9 and 5.9 inches, and says it can flip into a rocker. Those are two settings, not continuous adjustment; check the seated fit before committing. Manufacturer specifications.
• For standing work: the Ergodriven Topo Anti-Fatigue Standing Mat provides a contoured standing surface. It does not solve a dangling-feet problem while seated. The manufacturer describes its standing use and raised terrain; consider it alongside a realistic sit–stand routine.
• For a seat surface you want to change: the Cushion Lab Pressure Relief Seat Cushion adds contoured foam above the chair seat. Its manufacturer page describes the construction. Recheck the entire seated fit after adding it; its product name is not evidence that it treats a medical condition.
• For a gap behind your lower back: the ComfiLife Lumbar Support Pillow is a strapped memory-foam back cushion. Adjust the chair's backrest first. OSHA also suggests a rolled towel as temporary lumbar support. A back cushion does not replace support beneath your feet.

For a wider accessory shortlist, see our ergonomic desk accessories guide. Avoid buying several supports together: changing one variable makes the next fit check easier to interpret.

Before you keep the footrest

Try normal typing and reaching, rather than judging it from a posed photograph.

• Both feet remain supported without sliding forward in the chair.
• The support stays in place, with room to move your legs.
• Your knees clear the desk and your shoulders stay relaxed.

Common questions

How high should an under-desk footrest be?

High enough to support your feet in the correctly adjusted chair. Use the gap as an estimate, then judge the loaded fit. There is no single height that works across different desks, seats, footwear and footrest shapes.

Can a footrest fix a chair that is too large?

It may help unsupported feet, but it cannot change seat depth, backrest reach or desk clearance. If those remain wrong, examine chair fit. Cornell's workstation guide emphasizes comfortable, supported positioning and suggests seeking ergonomic advice when adjustments do not resolve the setup.

Should you hold the same position all day?

No. OSHA recommends changing position regularly even when the workstation fits well. A footrest should make support available; it should not lock your legs into one pose for the whole workday.