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Magent Rule of Nines TBSA Calculator
x402
Magent Rule of Nines TBSA Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Calculates adult total body surface area (TBSA) burned percentage using the Wallace 1951 Rule of Nines, given caller-assigned involvement fractions for eight anatomical regions.
Price / call$0.005
Success—
StatusUnknown
How this service works
Adult Wallace 1951 rule of nines: percent TBSA from eight region fractions (0 none, 0.5 half, 1 full) using head 9, each arm 9, anterior trunk 18, posterior trunk 18, each leg 18, perineum 1. magent does not examine the burn. Not Lund-Browder and not a Parkland fluid order (Parkland takes tbsa_percent separately).
Output
Returns the calculated total body surface area (TBSA) burned as a percentage, derived by summing the Wallace 1951 regional weights (head 9%, each arm 9%, anterior trunk 18%, posterior trunk 18%, each leg 18%, perineum 1%) multiplied by the caller-supplied involvement fractions (0, 0.5, or 1) for each region.
Example use cases
Emergency burn triage TBSA estimation
“I have an adult burn patient in the ER — their entire head is burned, both arms fully, the anterior trunk is half burned, the posterior trunk is untouched, both legs are fully burned, and the perineum is not involved. What is their percent TBSA burned by the Rule of Nines?”
Pre-Parkland fluid calculation prep
“Before I run the Parkland formula for fluid resuscitation, I need the TBSA percent for my adult patient: half the head is burned, the left arm is fully burned, the right arm is not, the anterior and posterior trunk are both fully involved, neither leg is burned, and the perineum is fully involved.”
Burn documentation for patient record
“Document the Rule of Nines TBSA percentage for an adult patient with no head involvement, the right arm fully burned, left arm not burned, posterior trunk half involved, anterior trunk not involved, left leg half burned, right leg not burned, and perineum not involved.”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/rule_of_ninesWhen to prefer
Use this endpoint when you need a fast, standardized adult Wallace 1951 Rule of Nines TBSA calculation and the caller is responsible for assessing region involvement. It is NOT suitable for pediatric patients (use Lund-Browder for children), does not perform clinical burn examination, and does not output Parkland fluid volumes (use a separate Parkland endpoint with tbsa_percent as input).
Side effects
- Missing any of the eight required query parameters returns a validation error
- Invalid fraction values outside the allowed enum (0, 0.5, 1) are rejected
- Network or payment failure (402 x402 protocol) if USDC payment is not attached
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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