Band & Chain Calculator
Calculate effective loading at different positions when using bands and chains for accommodating resistance. See how load varies from bottom to lockout.
About this calculator
Load at each bar position is Bar Weight plus a fraction of Band Tension plus a fraction of Chain Weight — 35% band and 50% chain at the bottom, 65% band and 75% chain at midpoint, and the full amount of both at lockout. Bar Weight adds identically to all three positions, so it dominates every individual load figure by default (it starts at 225 lb against a 60 lb band and 40 lb chain), but it cancels out completely from Load Range (Load at Lockout minus Load at Bottom) — that figure is driven entirely by how much band tension and chain weight get added between the bottom and the top, since Bar Weight appears in both the top and bottom load and subtracts to zero.
Estimated 1RM has no effect whatsoever on any load figure; it only exists to convert the load numbers into a percentage-of-max at each position, so raising or lowering it changes the % 1RM outputs without moving a single pound shown elsewhere on the page. This models straight-line accommodating resistance for barbell work — it does not account for band angle, chain length relative to your height, or how the resistance curve differs across squat, bench, and deadlift variations.
Medical Disclaimer
This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.
Inputs
Results
Load at Lockout
325 lb
≈ 15 car tires
How to Use This Calculator
- Enter the Bar Weight (total loaded barbell weight) in pounds.
- Set the Band Tension at Lockout and Chain Weight for your setup.
- Review the Estimated 1RM and the load breakdown at Lockout, Midpoint, and Bottom.
- Check the % of 1RM at each position to understand the accommodating resistance curve.
- Use Average Effective Load and Load Range to compare setups.
How the result changes with Bar Weight (loaded)
| Bar Weight (loaded) | Load at Lockout |
|---|---|
| 113 | 213 lb |
| 169 | 269 lb |
| 338 | 438 lb |
| 563 | 663 lb |
What each input means
- Bar Weight (loaded)
- Total weight on the barbell including the bar and all plates. This stays constant throughout the lift.
- Band Tension at Lockout
- Maximum band tension at the top of the lift. Refer to your band manufacturer's specs. Mini bands ~20 lb, light ~40 lb, average ~60 lb, strong ~80+ lb.
- Total Chain Weight
- Total weight of chains on both sides. Standard chains are 20 lb each (5/8 inch). About half rests on the floor at the bottom.
- Estimated 1RM
- Your current one-rep max for this lift. Used to calculate percentage of 1RM at each position.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersBar Weight (loaded) = 225, Band Tension at Lockout = 60, Total Chain Weight = 40, Estimated 1RM = 315 = 4 input(s) provided
- Calculate Load at LockoutLoad at Lockout325 = 325
- Calculate Load at MidpointLoad at Midpoint294 = 294
- Calculate Load at BottomLoad at Bottom266 = 266
Engine last updated . Checked against 1 independently-derived test — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Does raising my Estimated 1RM change how much weight is on the bar?
No. Estimated 1RM only feeds the "% 1RM" outputs (percentage of your max at each bar position) — it never appears in the Load at Bottom, Midpoint, or Lockout formulas. Changing it moves the percentages shown but leaves every pound figure on the page exactly where it was.
Why doesn't Bar Weight affect Load Range (top minus bottom)?
Bar Weight is added identically to the load at every position, so it appears in both Load at Lockout and Load at Bottom and cancels out completely when the calculator subtracts one from the other. Load Range is driven entirely by how much of your band tension and chain weight get added between the bottom and the top of the lift.
Why does Bar Weight dominate Load at Lockout when bands and chains are the point?
Because the default bar weight (225 lb) is larger than the default band tension (60 lb) or chain weight (40 lb), so the same percentage change to it moves more total pounds. Accommodating resistance is a real percentage-based effect, but on an absolute- pounds basis a heavier bar setup will still outweigh a lighter band or chain setup.
How is the chain percentage at the bottom different from the band percentage?
At the bottom of the lift, 50% of Chain Weight counts toward the load, while only 35% of Band Tension counts — the chain fraction is the larger of the two at the bottom, not the smaller. That's because this calculator models the chains as already half-loaded at the bottom position it represents, while band tension is still ramping up from a lower base at that same point in the range of motion — both fractions climb to 100% by lockout, but band tension starts from further behind.
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