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If one of your legs is shorter than the other, even by a few millimeters, you may feel it in your hips, lower back, knees or feet. A heel lift is one of the simplest and most affordable ways to level things out. But it only works well when you use it correctly: the right height, in the right shoe, introduced at the right pace. This guide walks you through exactly how to do that.
Place the heel lift inside the shoe of the shorter leg, with your heel sitting firmly against the back of the shoe. Start with about half of the measured difference (or the height your clinician recommends), wear it for only a few hours a day at first, and increase gradually over several weeks. Always have the difference measured properly before you start.
What Is Leg Length Discrepancy?
Leg length discrepancy (LLD) means your legs are not the same length. It is very common: many people have a small difference of a few millimeters and never notice it. Differences are usually grouped into two types:
- Structural (true) LLD: the bones of one leg are actually shorter. Causes include a past fracture, growth differences, surgery or joint replacement.
- Functional (apparent) LLD: the bones are equal, but the legs behave as if they are not because of a tilted pelvis, tight muscles, scoliosis or foot mechanics such as overpronation.
How Heel Lifts Work
A heel lift is a small wedge or insert that raises the heel inside your shoe. When it is placed under the shorter leg, it makes up the missing height so your pelvis sits closer to level while you stand and walk. Many people notice a more even stride and less strain through the lower back, hips and knees, although results vary from person to person.
It helps to know what a lift does not do. It does not lengthen the bone and it does not treat the underlying cause. It simply compensates for the difference while you stand, walk and run.
Who Should (and Shouldn’t) Use Heel Lifts?
Often a good fit
- Adults with a confirmed structural difference, commonly in the range of a few millimeters up to roughly 1.5 cm (about 1/2 inch).
- People whose clinician or physical therapist has recommended a lift.
- People with a long-standing difference and related low back, hip or knee discomfort.
Check with a professional first
- Children and teenagers who are still growing.
- Anyone who has had a hip or knee replacement or other leg surgery.
- Anyone with a sudden new difference, numbness, swelling or significant pain.
- Differences larger than about 2 cm, which often need a built-up shoe rather than an in-shoe lift.
Not every uneven feeling is a true leg length difference. A tilted pelvis from tight muscles can look identical, and a lift will not fix it. Get a proper assessment before buying.
How to Measure Your Leg Length Difference
Getting the number right is the foundation of everything else. Here are the common methods, from least to most accurate:
| Method | How it works | Accuracy |
|---|---|---|
| Tape measure | Measure from the hip bone (ASIS) to the inner ankle bone while lying down. | Basic estimate only; easy to get wrong at home |
| Standing block test | A clinician places thin boards under the shorter leg until the pelvis looks level. | Practical and widely used |
| X-ray (scanogram or standing full-length) | Imaging measures the exact bone lengths. | Most accurate; often used for larger differences |
If you are tempted to guess, don’t. Over-correcting is one of the most common reasons people feel worse after starting a lift.
Step-by-Step: How to Use a Heel Lift Correctly
- Confirm which leg is shorter. The lift always goes in the shoe on the shorter side. Placing it on the longer leg makes the problem worse.
- Decide on the starting height. A common approach, especially for a long-standing difference, is to start with about half of the measured gap (or the amount your clinician advises) rather than full correction. Your body has adapted for years and needs time.
- Prepare the shoe. Remove the existing insole if it is removable, then check that the shoe still has room for your foot. Shoes with a firm heel counter and a little extra depth work best.
- Position the lift. Slide it under the heel area so the back edge is flush with the back of the shoe. Your whole heel should sit on the lift with no gap and no overhang. If it slides, use the adhesive backing or a thin non-slip pad.
- Break in slowly. Wear it for 1 to 2 hours on day one, then add about an hour each day if everything feels fine. Mild tightness in the calf or a different feeling in the hips can be normal during adjustment, but sharp pain is not.
- Increase height gradually if needed. If you are aiming for a larger correction, add roughly 3 mm (1/8 inch) at a time, with a week or two between changes.
- Use it in all your everyday shoes. A lift only helps in the shoes you actually wear it in. Buy a second lift or an adjustable version for work shoes and sneakers.
- Re-check after a few weeks. If symptoms are improving, stay with it. If you feel new pain or imbalance, reduce the height and speak with a professional.
Supportive shoes with a stable heel, a removable insole and a little extra volume make heel lifts far more comfortable. Slip-ons, flip-flops and very shallow shoes are poor candidates.
Types of Heel Lifts Compared
| Type | Best for | Pros | Cons |
|---|---|---|---|
| Foam (EVA) | Everyday use, small corrections | Light, soft, affordable | Compresses over time; may need replacing |
| Cork | Medium corrections | Firm, durable, holds its shape | Can feel harder at first |
| Gel / silicone | Comfort and shock absorption | Cushioned, good for sensitive heels | Can slip; may compress under heavy loads |
| Layered / adjustable (peel-off) | Gradual build-up | Add or remove layers as you adapt | Layers can shift if not glued well |
| Full-length insole lift | People who want forefoot support too | Stable, covers the whole foot | Takes up more space in the shoe |
| External sole build-up (cobbler) | Larger differences | Corrects bigger gaps without crowding the shoe | Costs more; specific to one pair of shoes |
How to Choose the Right Heel Lift
When you compare products, look at these factors:
- Height or thickness: match it to your plan, not to the biggest option on the page. Adjustable or layered lifts are forgiving if you are not sure.
- Material and firmness: softer for comfort, firmer for durability and a heavier build or higher activity level.
- Shoe fit: measure the depth of your shoe. A tall lift in a snug shoe pushes your heel out.
- Grip: non-slip tops or adhesive backing keep the lift from shifting.
- Sold individually or as a pair: you usually only need one per shoe for the shorter leg. Buying a pair gives you a spare for another shoe.
- Return policy: comfort is personal, so a seller with easy returns is a safer choice.
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Common Mistakes to Avoid
- Self-diagnosing without measurement. The wrong height or wrong leg can aggravate symptoms.
- Going for full correction on day one. Sudden big changes can strain the back, hips and Achilles tendon.
- Wearing it in only one pair of shoes. Your body then switches between corrected and uncorrected walking all day.
- Cramming it into tight shoes. A lift that pushes the heel out of the shoe causes blisters and instability.
- Ignoring the cause of a functional difference. Stretching, strengthening and foot support may matter as much as the lift.
- Never rechecking. Needs can change with weight, activity, footwear or new injuries.
When to See a Professional
Book an appointment with a doctor, podiatrist or physical therapist if you notice any of the following:
- Pain that gets worse after wearing the lift, or sharp pain in the hip, knee or back.
- Numbness, tingling or swelling in the leg or foot.
- A noticeable limp or a difference that appeared suddenly.
- A child or teen with an uneven gait or uneven hips.
- A measured difference larger than about 2 cm.
This article is for general information only. It does not diagnose or treat any condition. Always talk to a qualified healthcare professional before starting a heel lift, especially if you have pain, a medical condition, or are correcting a difference in a child.
Frequently Asked Questions
Which shoe does the heel lift go in?
The shoe on the shorter leg. If you are not sure which leg is shorter, get it measured before you buy.
How high should a heel lift be?
It depends on the measured difference. Many people start with about half of the gap and build up gradually, and in-shoe lifts commonly range from a few millimeters up to around 1.5 cm. Larger gaps usually need a modified shoe.
How long does it take to get used to a heel lift?
Most people need one to four weeks to adapt. Start with short wear times and increase slowly.
Can I wear a heel lift every day?
Yes, if it is recommended for your situation and feels comfortable. For best results use it in all the shoes you wear regularly.
Do heel lifts work for functional leg length discrepancy?
Not always. When the cause is muscle tightness, pelvic tilt or foot mechanics, treating the cause (stretching, strengthening, orthotics) is usually more important than adding height.
Can I use one heel lift in both shoes?
No. The lift goes in the shorter leg’s shoe only. Using it in both shoes cancels out the correction.
Can heel lifts make my back pain worse?
They can if the height is wrong, if you increase too quickly, or if the problem is not actually leg length. Stop and talk to a professional if pain increases.
Ready to Find the Right Heel Lift?
Pick a lift that matches your measured difference, your shoes and your comfort needs, then build up slowly.
