Free tool
Resistance Band Force Calculator (lb & kg)
A resistance band has no single weight rating. Its force rises as you stretch it. This calculator uses a simple linear model from the maker's rating: a band rated 15 lb at its reference stretch gives about 7.5 lb at half that stretch and about 30 lb at twice that stretch. Real bands are not perfectly linear, so read the result as a rough force estimate, not a dumbbell weight, and never stretch past the maker's limit.
100% stretch means the band is pulled to twice its resting length. Makers state ratings differently — use the stretch on your band's packaging or listing if it gives one.
Estimated band force
≈ 15 lb
About 6.8 kg at 100% stretch.
Assumes force rises in a straight line from the rating (rating × your stretch ÷ rated stretch × bands). Real bands are not perfectly linear and vary by width, thickness and rubber, so this is a rough estimate, not a measured weight or a dumbbell match.
What to watch out for
Why band resistance is an estimate
Force depends on stretch, band width, thickness and the rubber compound, and real bands are not perfectly linear. Two bands with the same colour from different makers can differ substantially. The calculator scales the maker's rating in a straight line; it is not a measured or tested accuracy.
Bands and dumbbells load differently
A dumbbell is hardest where gravity has most leverage; a band is hardest at full stretch. That is why a band can feel easy at the start of a curl and brutal at the top.
Stack bands to progress
Adding a second band adds its resistance at the same stretch, which is a cleaner way to progress than stretching one band further than it was designed for.
Not for pull-up assistance
This calculator estimates pulling resistance for exercises such as rows, presses and squats. It does not tell you whether a band can hold your bodyweight. Short mini-loop bands (including the Gocha 5-level set) are not made for assisted pull-ups — use a long pull-up band its maker rates for that job; see the assisted pull-up guide.
Related guides
Questions
How much weight is a resistance band equal to?
There is no fixed equal. Force depends on how far you stretch the band. Under the calculator's linear model, a band rated 15 lb at its reference stretch gives about half that at half the stretch and about double at twice the stretch. Real bands vary, so treat it as an estimate.
What stretch is a band rated at?
It depends on the maker. Some quote a rating at a stated stretch, some give a range, and some do not say. Check the packaging or listing, set the reference stretch in the calculator to match, and stay within the maker's maximum stretch.
Can resistance bands replace weights?
For most general strength and conditioning goals, yes. For maximal strength training they are harder to load precisely.
How do I make a band harder without buying a heavier one?
Shorten your grip, step wider to increase stretch, or stack a second band.
What do the band colours mean?
Colours are only a manufacturer's own scale from lightest to heaviest — they are not standardised across brands.
Read the full guide
Resistance Band Levels Explained (Which Band to Start With)
Read