Enter the weight you use for a lying dumbbell triceps extension (often called a dumbbell skull crusher) to estimate an equivalent overhead dumbbell triceps extension weight. This calculator also works in reverse to convert an overhead extension weight back to the lying dumbbell extension equivalent.
Movement definitions used here: “Dumbbell Tricep Extension” = lying/skull-crusher style; “Overhead Extension” = standing or seated overhead dumbbell triceps extension. If your variation differs (cable, two-dumbbell, incline, or machine), the estimate may not apply.
Disclaimer: This calculator provides a rough training estimate—not medical advice. Use it as a starting point (many people do best beginning 5–15% lighter than the estimate), focus on controlled form, and increase gradually. Stop if you feel pain, and consult a qualified trainer or clinician if you have shoulder/elbow issues or are returning from injury.
- All Sports and Fitness Calculators
- Dumbbell Shoulder Press to Barbell Overhead Press Calculator
- Machine Shoulder Press to Free Weight Shoulder Press Calculator <
- Dip Strength to Bench Press Conversion Calculator
- EZ Bar Curl to Dumbbell Curl Conversion Calculator
Lying Dumbbell Triceps Extension to Overhead Triceps Extension Conversion Formula (Estimate)
The following formula is used to estimate the overhead extension weight based on the lying dumbbell triceps extension (skull crusher) weight.
OE = DTE × CF
Variables:
- OE is the Overhead Extension weight (in chosen units)
- DTE is the Lying Dumbbell Triceps Extension (Skull Crusher) weight (in chosen units)
- CF is the conversion factor (a rough heuristic; commonly tested around ~0.90–1.10 depending on form, range of motion, and equipment)
To estimate the overhead extension equivalent, multiply DTE by the chosen conversion factor (CF). Conversely, to estimate DTE from an overhead extension value, divide OE by CF.
| Lying DB Triceps Extension (DTE) | Overhead Triceps Extension (OE) |
|---|---|
| 2.50 | 2.75 |
| 5.00 | 5.50 |
| 7.50 | 8.25 |
| 10.00 | 11.00 |
| 12.50 | 13.75 |
| 15.00 | 16.50 |
| 17.50 | 19.25 |
| 20.00 | 22.00 |
| 22.50 | 24.75 |
| 25.00 | 27.50 |
| 27.50 | 30.25 |
| 30.00 | 33.00 |
| 32.50 | 35.75 |
| 35.00 | 38.50 |
| 37.50 | 41.25 |
| 40.00 | 44.00 |
| 42.50 | 46.75 |
| 45.00 | 49.50 |
| 47.50 | 52.25 |
| 50.00 | 55.00 |
| Example mathematical estimate using OE ≈ 1.10 × DTE. In practice, round to the nearest available dumbbell/plate increment (use the calculator’s rounding setting). | |
Understanding the Conversion
This conversion is a simple heuristic meant to help you choose a starting load when moving between a lying dumbbell triceps extension (skull crusher) and an overhead dumbbell triceps extension. Real-world “equivalency” can vary with technique, range of motion, fatigue, and the exact setup (bench angle, single vs. two dumbbells, and more), which is why the calculator lets you choose a conversion factor instead of enforcing only one value.
How to Calculate the Overhead Extension Equivalent?
Follow these steps to estimate the overhead extension weight:
- Measure the weight (DTE) used for lying dumbbell triceps extensions (skull crusher style).
- Choose a conversion factor (CF) that matches your technique and setup (for example, 1.00, 1.05, or 1.10).
- Calculate the overhead extension weight using the formula: OE = DTE × CF.
- To estimate DTE from an overhead extension value, divide the overhead extension weight by CF.
- Optionally round the result to the nearest available weight increment.
Example Problem:
Assume a lying dumbbell triceps extension weight (DTE) of 40 pounds. Using CF = 1.10:
OE = 40 × 1.10 = 44 pounds
