Enter the weight used on a single-leg press to calculate the estimated equivalent when using both legs on a bilateral leg press. This calculator can also convert from bilateral leg press weight back to an estimated single-leg press weight.
Safety note: These results are estimates only. Leg press machines vary (angle, friction, leverages, and true sled/start weight), and plates may be stamped in lb or kg—verify before loading. Start conservatively (often ~10–20% below any estimate) and progress gradually. If you have pain, a recent injury/surgery, or a medical condition that affects exercise tolerance, consult a qualified clinician or certified coach.
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Single-leg Press to Bilateral Leg Press Conversion Formula
The formula below estimates the bilateral leg press weight from a given single-leg press weight. It uses a common “bilateral deficit” assumption (example shown: ~10%), but the true value can vary by person, machine, technique, range of motion, and testing method.
BL = SL × 2 × 0.9
Variables:
- BL: Bilateral Leg Press Weight
- SL: Single-leg Press Weight
- 0.9: Example efficiency factor (i.e., a 10% bilateral deficit). Your factor may be different.
With the 10% example above, you multiply the single-leg press weight by two and then by 0.9. This simplifies to multiplying by 1.8, which is a commonly used starting point (not a universal rule).
| Single-Leg Press (kg) | Bilateral Leg Press (kg) |
|---|---|
| 20 | 36 |
| 30 | 54 |
| 40 | 72 |
| 50 | 90 |
| 60 | 108 |
| 70 | 126 |
| 80 | 144 |
| 90 | 162 |
| 100 | 180 |
| 110 | 198 |
| 120 | 216 |
| 130 | 234 |
| 140 | 252 |
| 150 | 270 |
| 160 | 288 |
| 170 | 306 |
| 180 | 324 |
| 190 | 342 |
| 200 | 360 |
| 220 | 396 |
| *Uses a common starting assumption: Bilateral ≈ 1.8 × Single; Single ≈ Bilateral ÷ 1.8. Factor is unit-agnostic (kg or lbs) and may vary by person and setup. | |
What is the Single-leg Press to Bilateral Leg Press Conversion?
This conversion provides an estimate of the weight you might press using both legs on a leg press machine, based on the weight you can press with one leg. Because the size of the bilateral deficit varies, it’s best treated as a rough guideline rather than an exact equivalence.
How to Calculate the Bilateral Leg Press Equivalent?
Follow these steps to determine an estimated bilateral leg press weight:
- Measure or determine the weight used during a single-leg press (SL) in your chosen unit (kg or lbs).
- Choose an assumed bilateral factor (often somewhere between about 1.6 and 2.0). If you use the common 10% deficit assumption, multiply SL by 1.8.
- Record the result as an estimated bilateral leg press weight (BL).
- If you have the bilateral leg press weight and want to estimate the single-leg value, divide by your chosen factor.
- Use the calculator above to compare scenarios, then test conservatively and adjust based on your own performance.
Example Problem:
If one leg presses 100 lbs and you use a factor of 1.8, then the estimated bilateral leg press weight is calculated as follows:
100 lbs × 1.8 = 180 lbs
