The kit: a gram scale, a tub and two numbers
Everything about this method is deliberately humble: a digital kitchen scale that reads in grams, a tub or box the snake will sit in, and somewhere to write two numbers down each month. Eyeballing prey against the snake is how portions quietly drift — one keeper's "medium" is another's "large," and a snake cannot tell you the meals have crept up. Weighing replaces opinion with a record. Each monthly session produces a pair of figures, the snake's weight and the weight of the prey you are about to offer, and those pairs are what turn feeding from habit into management.
Weighing the snake without skewing the result
Put the empty tub on the scale, zero it with the tare button, then settle the snake inside and read the grams once it stops rearranging itself. Timing is what makes the numbers comparable month to month: weigh before a scheduled feed, and at least a couple of days after the previous meal, so you are never reading a bellyful of rodent as body weight. Weigh at the same point in the feeding cycle every time — a snake weighed just after eating one month and empty the next will appear to gain and lose weight it never had. Keep the handling calm and brief; a monthly weigh-in folded into a routine enclosure check is over before the snake has decided to object.
Weighing the prey — and what the comparison tells you
Weigh each prey item after thawing, before it is offered, because frozen and thawed weights differ and it is the thawed meal the snake actually eats. Then compare it with the snake's own figure. A growing young python does well on a meal in the region of a tenth of its body weight; an adult, growing slowly if at all, needs proportionally less — a smaller fraction of its weight, offered less often. Run the second check alongside the numbers: the prey should be no wider than the widest part of the snake's body, and if a weighed item fails that test, the width rule wins. Note refusals in the log as faithfully as meals taken; a snake that suddenly refuses prey it used to take, at a size the record says is normal for it, is giving you information, not defiance.
Reading the log: growth, fasts and the vet line
A few months of paired numbers start to speak. A young python's line should climb steadily; a flat line in a growing snake means the meals are too small or too far apart. A level adult weight alongside a seasonal appetite dip is the classic ball python fast, and the log is what lets you watch it calmly — weight holding means the snake is fasting, not failing. The line to act on is steady loss: a snake that drops weight across two or three monthly checks while refusing food has crossed from normal fasting into territory for a reptile vet. The opposite drift matters too — weight climbing while length does not means the portions crept, and the fix is smaller prey or longer gaps, visible in your own numbers rather than argued from memory.
Entering each month's two weights as a completed duty in KinsLe's Care Teams turns the log into a timestamped growth record, so a slow trend shows up in the numbers long before it shows up in the snake.