For most lifters the squat is the better main lift and the leg press is the better second lift. The squat transfers more to your squat strength. The leg press lets you push the quads hard without worrying about balance. Trials show both build leg muscle, so the real decision is what you want the strength for.
This guide compares the two using four controlled trials. It covers muscle growth, strength transfer, squat depth and leg press range of motion, then gives a table for choosing, a way to program both, and a method for logging them so the numbers stay meaningful.
Is the leg press or the squat better?
The squat is better for building squat strength, and the leg press is a good way to add quad volume with less technical demand. Neither wins on muscle growth alone. Pick the squat when the barbell lift is the goal, and use the leg press to add work when balance, technique or fatigue limit squat volume.
The two lifts overlap heavily. Both load the quads, adductors and glutes through a bend and extension of the hip and knee. The differences are in what surrounds that movement:
- Barbell squat. You balance a loaded bar on your back, so your trunk and balance are part of the lift.
- Leg press. The machine fixes the path and supports your back, so the legs do almost all of the work.
That difference drives everything below. The squat is a skill as well as a strength exercise. The leg press is closer to pure leg effort. Our guide to free weights versus machines covers the same trade-off across all exercises.
Which builds more muscle?
Neither has been shown to build more muscle. Trials that compare free weights with machines find similar growth in the quads. In a 2020 trial of 46 people, 8 weeks of free weights or machines raised quad and biceps thickness with no difference between groups.
Schwanbeck and colleagues (2020) randomised 46 people, 26 of them women, to train with free weights or machines for 8 weeks. Each muscle group was trained two to three times a week with 3 to 4 sets of 4 to 10 repetitions. Muscle thickness rose in both groups and the groups did not differ.
The same trial measured strength. Free-weight bench press and squat strength, and Smith machine squat strength, increased 11 to 19% in both groups with no difference between them. The one exception was machine bench press, where the machine group improved more (13.9% versus 8.6%).
This trial compared free weights with machines in general, not the barbell squat against the leg press in particular. It does support a simple reading: the muscle responds to hard, repeated work, and the tool matters less than most debates suggest.
There is a practical argument for the leg press as well, and it is reasoning, not a trial result. Because the machine is stable, you can take sets close to failure without a balance or technique limit cutting the set short. If your quads fatigue after your lower back or balance does on the squat, the leg press lets the quads finish the job. Our guide to effective reps for hypertrophy explains why those last hard reps matter.
Which builds more strength?
The squat builds more squat strength. In a 10-week trial, lifters who trained only the squat improved their squat 1RM more than lifters who trained only the leg press. Leg press training still built leg strength, but less of it carried over to the barbell.
Rossi and colleagues (2018) split lifters into three groups: squat only, leg press only, and both. Everyone did two lower-body sessions a week for 10 weeks, with 6 sets per session at loads of 8 to 12 reps maximum and rest of 90 to 120 seconds. Only the exercise changed.
The squat group showed greater transfer to maximal squat strength than the leg press group. For countermovement jump, effect sizes favoured the squat and combined groups over leg press only. For dynamic balance, effect sizes were larger for the combined and leg press groups than for squat only. The authors noted that no differences between conditions reached statistical significance on those functional tests.
The authors summarised the finding this way:
"These findings suggest that both free weights and machines can improve functional outcomes, and that the extent of transfer may be specific to the given task." (Rossi et al., 2018)
The practical reading is specificity. If you are testing a barbell squat, whether in a meet, a program check or just your own pride, you need to squat. If you want strong legs in general, either lift works. The squat is a skill, so strong legs alone do not guarantee a strong squat.
If you squat in a particular style, the same logic applies within the lift. Our comparisons of high-bar and low-bar squats and front and back squats cover how much each variation carries over.
Does squat depth or leg press range of motion matter?
Squat depth matters for the glutes and adductors, and for how well your strength carries over to full squats. Leg press range of motion did not change quad growth in trained lifters. So go deep on squats, and treat a very deep leg press as optional.
Squat depth. Kubo and colleagues (2019) assigned 17 men to full squats or half squats, twice a week for 10 weeks, and measured muscle volume by MRI. The results by muscle:
| Muscle | Full squat group | Half squat group |
|---|---|---|
| Knee extensors (quads) | +4.9% | +4.6% |
| Gluteus maximus | +6.7% | +2.2% |
| Adductors | +6.2% | +2.7% |
| Rectus femoris and hamstrings | No change | No change |
Quad growth was almost identical. The difference showed up in the glutes and adductors, where the full squat group gained significantly more. The authors concluded that full squat training was more effective for developing the lower limb muscles, excluding the rectus femoris and hamstrings.
Strength followed depth too. Full squat 1RM rose 31.8% in the full squat group but only 11.3% in the half squat group. Half squat 1RM rose by a similar amount in both groups (24.2% and 32.0%, no significant difference). You get stronger at the depth you train.
Leg press range of motion. Larsen and colleagues (2025) studied 23 resistance-trained people with an average of 7.2 years of training. Each did unilateral leg presses, four sets to momentary failure twice a week for 8 weeks. One leg used about 5 to 100 degrees of knee flexion. The other used each person's maximum range, about 5 to 154 degrees.
Quad thickness rose in both legs, by 1.08 to 1.91 mm, and the Bayesian analysis found moderate to extreme evidence for no difference between ranges. The result applies to this population and an 8-week period. It does not say depth never matters, but it does say you do not have to grind out an extreme range to grow your quads on this machine.
One caution is about reading these studies across lifts. The squat depth trial found a difference in glutes and adductors, and the leg press trial measured only the quads. If you rely on the leg press for glute growth, nothing here tells you it will match a deep squat.
Which should you choose?
Choose the squat if you want a stronger squat, and choose the leg press if you want leg volume with less technique demand. Choose both if you can recover from them. The table below is practical reasoning built on the trials above, not a validated protocol.
| Your situation | Better pick | Why |
|---|---|---|
| You are testing or competing in the barbell squat | Squat | Strength transfer to the squat was greatest from squat training (Rossi et al., 2018). |
| You want glute and adductor growth as well as quads | Deep squat | Full squats grew these muscles more than half squats (Kubo et al., 2019). |
| You are new and still learning to brace and balance | Leg press, then add squats | The machine removes the balance demand, so you can train hard while you learn the squat. |
| Your lower back or balance ends squat sets before your legs do | Leg press for extra volume | The stable path lets the quads reach hard sets (practical reasoning). |
| You train at home or in a crowded gym with no rack | Whichever you can load progressively | Muscle growth was similar across free weights and machines (Schwanbeck et al., 2020). |
| You have knee or back pain that persists | See a physiotherapist or doctor first | A trial result cannot tell you which lift is safe for an injury. |
For a lifter with no special constraint, the combination is simple and covered in the next section. If you are choosing between variations of the same pattern, our guide to unilateral versus bilateral training covers single-leg options too.
How do you program both?
Squat first, with heavy sets that stop one to three reps short of failure, then leg press for moderate to high reps taken closer to failure. This is practical reasoning, not a tested protocol. It puts the technical lift when you are fresh and the stable lift when your legs are tired.
A simple layout for one lower-body day:
- Squat: 3 to 4 sets of 4 to 8 reps, stopping with 1 to 3 repetitions in reserve (RIR).
- Leg press: 2 to 4 sets of 8 to 15 reps, finishing close to failure.
- Accessory work: hamstrings and calves, because the quad exercises above do not train hamstrings much (the hamstrings did not grow in the Kubo trial).
Progress each lift on its own. Double progression fits the leg press well: pick a rep range such as 10 to 15, add reps until you reach the top, then add load and start again. For the squat, a top set followed by back-off sets suits heavier work, which our guide to top sets and back-off sets explains.
How hard each set is matters more than the order. If you rate effort with RIR, a squat set at 2 RIR and a leg press set at 0 to 1 RIR are both honest hard sets, just on different tools. Rossi's lifters used 8 to 12 rep maximum loads on both lifts, and that is a reasonable starting range.
How much total volume should you do? The trials above do not settle it, so start modestly and adjust to how you recover. Doing both lifts in a week adds up quickly, because each set of leg press counts toward your weekly quad work.
How do you log squats and leg presses in IronLedger?
Log them as two separate lifts with load, reps and RPE or RIR on every set, and compare each against its own history. IronLedger keeps that history without a cutoff, so you can see whether either lift is actually moving over a block.
IronLedger is a free strength training app that records the details this comparison depends on. On the product page you can see how it handles each of these:
- Per-set logging. Load, reps, RPE in half steps or RIR, and a free-text note on any set.
- Notes for setup. Machines differ between gyms. Write the seat position and foot placement in the set note, so a number from one machine is not compared with a different setup.
- Estimated 1RM per lift. IronLedger uses the Epley formula, weight x (1 + reps / 30), and prints it on the progress page. A 100 kg set of 5 gives an estimate of 116.7 kg. Treat it as a direction of travel, not a promise about a max attempt.
- Personal records per lift. Records for weight, volume and estimated 1RM are tracked per exercise, and a set that beats one is flagged as you log it. Our guide to estimated one-rep max explains the limits of the estimate.
- Mid-session changes. If the leg press is taken, you can replace the exercise while the workout is running.
- Load recommendations that show their reason. On IronLedger's five load-and-go built-in programs, each exercise gets a recommended load with a one-sentence reason: hit every prescribed rep at an easy effort and it adds 2.5 kg or lb, miss reps or log a hard session and it holds. You can override it. Custom and imported programs don't get recommendations.
Do not add leg press kilograms to squat kilograms or compare them. A squat kilogram and a leg press kilogram are different loads on different movements. Total tonnage across both is a weak measure. Your workout history is more useful when each lift has its own line.
What mistakes should you avoid?
Most mistakes come from treating the two lifts as interchangeable, or from chasing load on a machine that is easy to load. Judge each lift by its own trend, and let effort, not the plate count, tell you whether a set was hard.
- Comparing weights across lifts. A big leg press number does not predict your squat, which the Rossi trial illustrates by showing that leg press training carried over less to squat strength.
- Using the leg press to avoid learning the squat. If you want squat strength, the squat is the practice. Machine work alone leaves a gap.
- Quarter-depth reps for a bigger number. In the Kubo trial, half squats gained far less full-squat strength and less glute and adductor growth than full squats.
- Changing the setup and losing the trend. A different seat angle or foot position changes the lift. Note it so the history stays honest.
- Treating one trial as a rule. These trials are small. The Kubo study had 17 men, and the Larsen study measured quads only over 8 weeks. They support a direction, not a guarantee.
- Ignoring pain. Persistent knee or back pain needs assessment, and no exercise comparison can replace it.
Frequently asked questions
For the quads, trials suggest so. A 2020 trial found similar muscle thickness gains from free weights and machines over 8 weeks. Full squats grew the glutes and adductors more than half squats in a separate trial.
Sources and references
- Kubo et al., Effects of squat training with different depths on lower limb muscle volumes — knee extensor volume rose 4.9% and 4.6% in full and half squat groups; glute and adductor gains were greater with full squats (Eur J Appl Physiol, 2019).
- Rossi et al., Strength, body composition, and functional outcomes in the squat versus leg press exercises — squat training had greater transfer to maximal squat strength; transfer may be specific to the task (J Sports Med Phys Fitness, 2018).
- Schwanbeck et al., Effects of training with free weights versus machines on muscle mass, strength, free testosterone, and free cortisol levels — similar muscle thickness gains and 11 to 19% squat strength gains in both groups over 8 weeks (J Strength Cond Res, 2020).
- Larsen et al., Knee flexion range of motion does not influence muscle hypertrophy of the quadriceps femoris during leg press training in resistance-trained individuals — quad thickness rose 1.08 to 1.91 mm with both a limited and a maximal range (J Sports Sci, 2025).
- IronLedger product page — per-set RPE and RIR, notes, estimated 1RM, personal records and exercise replacement during a workout.
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