Lying Leg Curl Strength Standards Calculator
Compare your Lying Leg Curl strength with Endura's strength standards for men and women at your bodyweight. A useful benchmark for a good one-rep max is our Intermediate standard: approximately 82 lb at 190 lb for a man and 49 lb at 150 lb for a woman.
How does your best lift compare? Enter your bodyweight, selected or loaded machine resistance for both legs together, and the reps you completed below. The calculator estimates your one-rep max and shows your strength level for your bodyweight. Enter the number of repetitions you completed in one set, using whole numbers. Keep your hips and pelvis on the pad. Curl from the same near-extended knee position to a controlled bent-knee finish, then lower under control before the next repetition.
The calculator compares that estimated one-rep max with the Lying Leg Curl standards for your sex at your bodyweight. It preserves the calculator's existing equations, thresholds, and input meanings; the benchmark is a comparison target, not a working-set prescription.
Understanding Your Lying Leg Curl Strength Score
Your Lying Leg Curl strength score is Estimated 1RM divided by bodyweight, using only strict prone bilateral hamstring isolation performed under a repeatable machine setup. The score ranks strict bilateral machine knee-flexion strength, not a universal machine-stack number.
Compared with a 200 lb male who reaches a 128 lb Estimated 1RM, the ratio is 128 / 200 = 0.64, which reaches Advanced for men. The same 128 lb estimate at 240 lb bodyweight is only 0.53x bodyweight, so the bodyweight-normalized score changes the interpretation.
A 150 lb female reaching 74 lb has a 0.49 ratio, which reaches Advanced for women when the same setup and range are preserved. A larger number produced by a changed machine setting or shortened range is not a better standards result.
Execution gives the score its meaning. Hips and pelvis stay fixed on the body pad; hip lift, pad slide, pelvis rotation, handle-yanking, partial pulses, stack bounce, uncontrolled return, single-leg substitution, and per-leg resistance entry do not count.
Read the badge as strict bilateral machine knee-flexion strength under one repeatable standard, not as proof that every machine or neighboring lift would rank the same way.
Lying Leg Curl Strength Standards
Lying Leg Curl strength standards convert your Estimated 1RM-to-bodyweight ratio into Beginner, Novice, Intermediate, Advanced, Elite, and Stretch targets. Use the table for your sex, choose the nearest bodyweight row, then compare the calculated Estimated 1RM with the target columns.
These tables assume a dedicated lying leg curl machine with the same body pad, hip position, lower-leg pad, start range, finish range, and total bilateral machine resistance convention. Table targets stop being valid when the tested range, setup, resistance convention, or movement identity changes.
Men’s Lying Leg Curl Strength Standards
| Bodyweight | Novice | Intermediate | Advanced | Elite | Stretch |
|---|---|---|---|---|---|
| 120 lb | 31 lb | 52 lb | 77 lb | 101 lb+ | 120 lb |
| 130 lb | 34 lb | 56 lb | 83 lb | 109 lb+ | 130 lb |
| 140 lb | 36 lb | 60 lb | 90 lb | 118 lb+ | 140 lb |
| 150 lb | 39 lb | 65 lb | 96 lb | 126 lb+ | 150 lb |
| 160 lb | 42 lb | 69 lb | 102 lb | 134 lb+ | 160 lb |
| 170 lb | 44 lb | 73 lb | 109 lb | 143 lb+ | 170 lb |
| 180 lb | 47 lb | 77 lb | 115 lb | 151 lb+ | 180 lb |
| 190 lb | 49 lb | 82 lb | 122 lb | 160 lb+ | 190 lb |
| 200 lb | 52 lb | 86 lb | 128 lb | 168 lb+ | 200 lb |
| 210 lb | 55 lb | 90 lb | 134 lb | 176 lb+ | 210 lb |
| 220 lb | 57 lb | 95 lb | 141 lb | 185 lb+ | 220 lb |
| 230 lb | 60 lb | 99 lb | 147 lb | 193 lb+ | 230 lb |
| 240 lb | 62 lb | 103 lb | 154 lb | 202 lb+ | 240 lb |
| 250 lb | 65 lb | 108 lb | 160 lb | 210 lb+ | 250 lb |
| 260 lb | 68 lb | 112 lb | 166 lb | 218 lb+ | 260 lb |
Women’s Lying Leg Curl Strength Standards
| Bodyweight | Novice | Intermediate | Advanced | Elite | Stretch |
|---|---|---|---|---|---|
| 100 lb | 19 lb | 32 lb | 49 lb | 66 lb+ | 80 lb |
| 110 lb | 21 lb | 35 lb | 54 lb | 73 lb+ | 88 lb |
| 120 lb | 23 lb | 38 lb | 59 lb | 79 lb+ | 96 lb |
| 130 lb | 25 lb | 42 lb | 64 lb | 86 lb+ | 104 lb |
| 140 lb | 27 lb | 45 lb | 69 lb | 92 lb+ | 112 lb |
| 150 lb | 29 lb | 48 lb | 74 lb | 99 lb+ | 120 lb |
| 160 lb | 30 lb | 51 lb | 78 lb | 106 lb+ | 128 lb |
| 170 lb | 32 lb | 54 lb | 83 lb | 112 lb+ | 136 lb |
| 180 lb | 34 lb | 58 lb | 88 lb | 119 lb+ | 144 lb |
| 190 lb | 36 lb | 61 lb | 93 lb | 125 lb+ | 152 lb |
| 200 lb | 38 lb | 64 lb | 98 lb | 132 lb+ | 160 lb |
| 210 lb | 40 lb | 67 lb | 103 lb | 139 lb+ | 168 lb |
| 220 lb | 42 lb | 70 lb | 108 lb | 145 lb+ | 176 lb |
For men, Beginner is below 0.26x, Novice begins at 0.26x, Intermediate begins at 0.43x, Advanced begins at 0.64x, Elite begins at 0.84x, and the stretch benchmark is 1.00x bodyweight. For women, Beginner is below 0.19x, Novice begins at 0.19x, Intermediate begins at 0.32x, Advanced begins at 0.49x, Elite begins at 0.66x, and the stretch benchmark is 0.80x bodyweight.
At 200 lb bodyweight, a male lifter needs about 128 lb for Advanced and 168 lb for Elite. At 150 lb bodyweight, a female lifter needs about 74 lb for Advanced and 99 lb for Elite.
Boundary values are lower-inclusive. A male result exactly at 0.64x counts as Advanced, and a female result exactly at 0.66x counts as Elite.
How the Lying Leg Curl Calculator Works
The Lying Leg Curl calculator estimates 1RM from the entered machine resistance and reps, divides that estimate by bodyweight, then compares the ratio with sex-specific standards. Ratio = Estimated 1RM / bodyweight.
If a 200 lb male records a 128 lb single, the ratio is 128 / 200 = 0.64, which is Advanced because the Advanced boundary is lower-inclusive. If he records 168 lb, the ratio is 0.84, which reaches Elite.
If a 150 lb female records 99 lb, the ratio is 99 / 150 = 0.66, which reaches Elite for women when the same standard is used.
The calculation applies to strict prone bilateral hamstring isolation. Do not enter leg extension, seated leg curl, Romanian deadlift, stiff-leg deadlift, good morning, leg press, unilateral variations, partial-range work, assisted reps, or resistance values borrowed from a different machine family.
The result can rank a tested set against bodyweight-based standards, but it cannot prove transfer to every related lift or machine because geometry, support, and range change the test.
Elite Lying Leg Curl Strength Levels
Elite Lying Leg Curl strength starts at 0.84x bodyweight for men and 0.66x bodyweight for women. Stretch benchmarks sit higher at 1.00x for men and 0.80x for women.
Perform a 168 lb Estimated 1RM at 200 lb bodyweight and the male ratio is 0.84, which reaches Elite. Perform 99 lb at 150 lb bodyweight and the female ratio is 0.66, which reaches Elite or better.
Elite proves that hamstring force through controlled knee flexion remains strong under the tested setup. It does not count when the score is inflated by leg extension, Romanian deadlift, stiff-leg deadlift, shorter range, assistance, or a machine setting that changes the movement.
At high ratios, failures usually appear as range loss, setup drift, finish weakness, or uncontrolled return. A cleaner 168 lb result is more meaningful than a heavier number that breaks the standard.
Lying Leg Curl Strength Compared to Other Lifts
Lying Leg Curl comparisons are useful for weakness detection, not for copying one standards result into another calculator. Each neighboring lift changes support, path, muscle contribution, resistance convention, or range.
| Related Movement | Comparison Purpose | Key Constraint Difference | What The Gap Reveals |
|---|---|---|---|
| Leg Extension | compare knee-flexion isolation with the opposite seated knee-extension machine | leg extension tests quadriceps knee extension, while lying leg curl tests hamstring knee flexion | What The Gap Reveals: opposite-machine isolation anchor can show whether the leg curl score reflects strict bilateral machine knee-flexion strength or a different strength quality. |
| Romanian Deadlift | contrast isolated knee flexion with posterior-chain hip hinging | Romanian deadlift uses hip extension and barbell bracing, while lying leg curl isolates knee flexion | What The Gap Reveals: posterior-chain hinge contrast can show whether the leg curl score reflects strict bilateral machine knee-flexion strength or a different strength quality. |
| Stiff-Leg Deadlift | separate hamstring hinge strength from prone machine curl strength | stiff-leg deadlift challenges hip hinge range and spinal bracing, while lying leg curl uses machine-guided knee flexion | What The Gap Reveals: hamstring hinge context can show whether the leg curl score reflects strict bilateral machine knee-flexion strength or a different strength quality. |
| Good Morning | compare hamstring involvement with a trunk-braced hip hinge | good morning strength depends heavily on spinal position and hip extension, unlike prone machine knee flexion | What The Gap Reveals: trunk-bracing contrast can show whether the leg curl score reflects strict bilateral machine knee-flexion strength or a different strength quality. |
| Leg Press | show the compound lower-body machine ceiling without substituting it for leg curl strength | leg press uses hip and knee extension with large machine resistance, while lying leg curl isolates knee flexion | What The Gap Reveals: compound machine ceiling can show whether the leg curl score reflects strict bilateral machine knee-flexion strength or a different strength quality. |
| Barbell Sumo Deadlift | compare hamstring isolation with a heavy posterior-chain pull | sumo deadlift uses full-body pulling mechanics, while lying leg curl removes hip extension and standing bracing | What The Gap Reveals: posterior-chain pull contrast can show whether the leg curl score reflects strict bilateral machine knee-flexion strength or a different strength quality. |
If a 200 lb male reaches 168 lb on leg curl but ranks lower on the closest free-weight comparison, the gap may show that machine support is helping more than free-weight control. If the related lift is stronger but leg curl stalls, the likely limiter is the specific machine path, range, or finish.
Use comparison gaps as clues about hamstring force through controlled knee flexion, not as permission to replace one tested standard with another.
Milestones in Lying Leg Curl Strength
Lying Leg Curl milestones show when the bodyweight-ratio score moves from basic standards toward Advanced, Elite, and Stretch-level performance. Every milestone assumes the same machine setup and strict execution.
| Men’s Milestone | Ratio | 200 lb Target | Decision Rule |
|---|---|---|---|
| Intermediate | 0.43x bodyweight | 86 lb Estimated 1RM | Build repeatable range before chasing Advanced. |
| Advanced | 0.64x bodyweight | 128 lb Estimated 1RM | Retest only when the same setup is preserved. |
| Elite | 0.84x bodyweight | 168 lb Estimated 1RM+ | Reject any score raised by a changed range or assistance. |
| Stretch Benchmark | 1.00x bodyweight | 200 lb Estimated 1RM | Use as a long-range benchmark, not a shortcut target. |
| Women’s Milestone | Ratio | 150 lb Target | Decision Rule |
|---|---|---|---|
| Intermediate | 0.32x bodyweight | 48 lb Estimated 1RM | Build repeatable range before chasing Advanced. |
| Advanced | 0.49x bodyweight | 74 lb Estimated 1RM | Retest only when the same setup is preserved. |
| Elite | 0.66x bodyweight | 99 lb Estimated 1RM+ | Reject any score raised by a changed range or assistance. |
| Stretch Benchmark | 0.80x bodyweight | 120 lb Estimated 1RM | Use as a long-range benchmark, not a shortcut target. |
Someone at 200 lb with a 160 lb valid result is about 8 lb short of the Elite target. A 150 lb female at 68 lb is about 6 lb short of the Advanced target.
Choose the next target by the smallest honest gap: add resistance when range and finish are clean, improve execution consistency when the same score wobbles, and retest only when the same standard can be repeated.
Milestone progress is rejected when a higher score comes from a different range, assistance, machine setting, unilateral substitution, or resistance convention.
Related Strength Standards Tools
Related strength standards tools place Lying Leg Curl inside a broader movement ecosystem. The goal is to compare what the current score may reveal, not to treat nearby tools as substitutions.
- Leg Extension compare knee-flexion isolation with the opposite seated knee-extension machine so the leg curl result is compared against prone machine isolation comparison, with the main difference that leg extension tests quadriceps knee extension, while lying leg curl tests hamstring knee flexion.
- Romanian Deadlift contrast isolated knee flexion with posterior-chain hip hinging so the leg curl result is compared against hamstring-related compound hinge strength, with the main difference that Romanian deadlift uses hip extension and barbell bracing, while lying leg curl isolates knee flexion.
- Stiff-Leg Deadlift separate hamstring hinge strength from prone machine curl strength so the leg curl result is compared against free-weight hamstring-loaded hinge strength, with the main difference that stiff-leg deadlift challenges hip hinge range and spinal bracing, while lying leg curl uses machine-guided knee flexion.
- Good Morning compare hamstring involvement with a trunk-braced hip hinge so the leg curl result is compared against posterior-chain and brace strength, with the main difference that good morning strength depends heavily on spinal position and hip extension, unlike prone machine knee flexion.
- Leg Press show the compound lower-body machine ceiling without substituting it for leg curl strength so the leg curl result is compared against machine-supported lower-body strength, with the main difference that leg press uses hip and knee extension with large machine resistance, while lying leg curl isolates knee flexion.
- Barbell Sumo Deadlift compare hamstring isolation with a heavy posterior-chain pull so the leg curl result is compared against compound pulling strength, with the main difference that sumo deadlift uses full-body pulling mechanics, while lying leg curl removes hip extension and standing bracing.
Use the list in order when diagnosing a gap. A stronger related score with a weaker leg curl result usually points toward the specific machine path, range, or isolation demand; a stronger leg curl result with weaker related lifts may show that support or guidance is carrying part of the performance.