CALCBIOME — SCORPION CALCULATOR

How much should your scorpion eat?

Prey size, number of crickets or roaches, feeding frequency and post-molt wait, calculated from species, size, temperature and body condition.

12 SPECIES + YOURSPandinus, Heterometrus, Hadogenes, Scorpio, Euscorpius…
YOUR WHOLE COLLECTIONSeveral scorpions, next meal, molt and refusal tracking.
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Name

Species

Length (cm, tail included)

Situation

Temperature (°C)

From the front of the head to the tip of the tail, claws not included.

Belly (mesosoma) seen from above

Molt

Last molt date

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Prey size: no longer than half the scorpion’s body (without the tail). Several small prey are better than one huge one.
Frequency: a juvenile eats twice a week, an adult once a week or every 10 days. Big black scorpions eat 2–3 crickets per meal.
Check the belly: if it is swollen with white membranes between the segments, it is not hungry. If it is flat, feed it.
Molting: before a molt it refuses food, which is normal. Afterwards, wait 3–10 days for the exoskeleton to harden.
Buthidae (Centruroides, Babycurus…) have stronger venom: never handle them. Big black scorpions (Pandinus, Heterometrus) are better for beginners.

Length	Prey	Per meal	Frequency	After molt
2 cm	Pinhead crickets (3–5 mm)	1	every 3 days	wait 3 days
4 cm	Small crickets (6–9 mm)	1	every 4 days	wait 4 days
6 cm	Medium crickets (12–15 mm)	1	every 5 days	wait 4 days
9 cm	Large crickets (18–22 mm)	1	every 6 days	wait 6 days
12 cm	Adult crickets (25 mm)	2	every 8 days	wait 7 days
16 cm	Adult crickets (25 mm)	4	every 10 days	wait 8 days

These are average guidelines. Every scorpion is different: the belly matters more than the calendar.

Maximum prey size (mm) = scorpion length (cm) × 2.6, about half its body without the tail.
Amount per meal: about 25% of the estimated weight for a juvenile, decreasing to about 10% for an adult, converted into crickets or roaches.
Days between meals = (2 + 0.5 × length) × species speed × temperature × body condition. Thin × 0.7, plump × 1.8; under 18 °C × 2, 18–20 °C × 1.4, 20–22 °C × 1.15.
Wait after a molt (days) = 2 + 0.4 × length, between 3 and 10 days.

12 cm Pandinus imperator, 24 °C, normal body: prey up to 31 mm, 2 adult crickets every 10 days, and a 7-day wait after a molt.

Sources: The Scorpion Files; common keeping practice. These are guidelines: body condition matters more than the calendar.

Usually once a week to once every two weeks, depending on species, size and temperature.

Usually not: a well-fed scorpion or one close to a molt can fast for weeks. Remove the prey and try again a week later.

No longer than half the scorpion's body (without the tail). Several small prey are better than one huge one.

A few days for a juvenile, about a week for an adult, until the exoskeleton hardens.

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