Calculator
Weighted Vest Weight Calculator
Enter your bodyweight and training history; get a starting load and a progression.
The usual advice is "five to ten percent of bodyweight", which is correct and almost useless, because nobody wants a percentage — they want a number of pounds and a plan for what to do in week three. That is what this works out.
The starting load is deliberately conservative. Connective tissue adapts more slowly than your cardiovascular system does, so the limit in the first month is your Achilles tendons and the front of your shoulders, not your fitness.
How the number is worked out
Walking loads are set as a percentage of bodyweight, then adjusted for how long you have been walking regularly. Somebody new starts at four percent and somebody who already trains starts at eight, because the constraint in the first month is tendon and joint adaptation rather than whether the weight feels heavy.
Strength work uses a wider band, because the load is carried for a set rather than for an hour and the failure mode is different. The ceiling is still there: past about twenty percent of bodyweight on your chest, a vest interferes with the movement it is meant to load.
The progression adds roughly a quarter of the starting load every three weeks, never weekly. If any week is uncomfortable, repeat it rather than progressing — that is not a setback, it is what the plan expects. The full reasoning, including what "too heavy" actually feels like, is in how much weight to put in a weighted vest.
Once the calculator sends you past about thirty pounds, stop and read weighted vest versus rucking. Beyond that point a pack carries the weight better than a vest can.
Common questions
Why does the calculator cap walking loads around ten percent of bodyweight?
Because above roughly ten percent, the load starts changing how you walk rather than just making the walk harder. Stride shortens, the torso leans forward to counterbalance the weight on your chest, and the extra force goes through your knees and lower back instead of being absorbed the way it is at lighter loads. Above that ceiling a pack distributes weight better than a vest does, so the sensible next step is rucking rather than a heavier vest.
The calculator gave me a lighter weight than I expected. Is it wrong?
Probably not. Almost everyone overestimates their starting load, because a vest feels trivial in a shop and quite different forty minutes into a walk two days running. The number that matters is the one you can carry three times a week for a month without your neck or your Achilles complaining, not the one that feels hard on day one. If the starting load genuinely feels like nothing after three weeks, the progression column tells you what to add.
Can I use this if I am new to exercise entirely?
Walk unloaded first. Build to thirty minutes of comfortable walking, three or four times a week, and hold that for a month before you add any weight at all. Adding load to a habit that does not exist yet is the most reliable way to end up with neither. The calculator assumes you already walk regularly.
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This calculator gives general fitness guidance, not medical advice. It cannot know about a previous injury, a diagnosis of bone loss, a spinal condition or a pregnancy, all of which change whether added load is safe for you. Talk to your doctor before loading if any of those apply.