Estimated due date, gestational age and trimester from the last period (Naegele
Estimated due date, gestational age and trimester from the last period (Naegele rule), with key milestone dates.
Answeringour last check, 2026-10-21
1 of 1checks answered this week
1132 msmedian answer time
$0.02listed price per call
$0.02price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://fitness-calc.x402tookit.com/due-date
| Category | Everything else |
|---|---|
| Provider host | fitness-calc.x402tookit.com |
| Networks | eip155:137, eip155:42161, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-21 | valid payment request | 402 | $0.02 | 1132 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"asOf": "2026-03-12",
"lmp": "2026-01-01"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"asOf": {
"description": "Date to compute the current gestational age for (default today)",
"type": "string"
},
"cycleDays": {
"description": "Average cycle length, 21 to 45 (default 28)",
"type": "integer"
},
"lmp": {
"description": "First day of last menstrual period, YYYY-MM-DD",
"type": "string"
}
},
"required": [
"lmp"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"computedForDate": {
"type": [
"null",
"string"
]
},
"cycleDays": {
"type": [
"null",
"number"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"dueDate": {
"type": [
"null",
"string"
]
},
"gestationalAge": {
"type": [
"null",
"string"
]
},
"gestationalDays": {
"type": [
"null",
"number"
]
},
"lmp": {
"type": [
"null",
"string"
]
},
"milestones": {
"properties": {
"anatomyScanWindowEnd": {
"type": [
"null",
"string"
]
},
"anatomyScanWindowStart": {
"type": [
"null",
"string"
]
},
"conceptionEstimate": {
"type": [
"null",
"string"
]
},
"endFirstTrimester": {
"type": [
"null",
"string"
]
},
"endSecondTrimester": {
"type": [
"null",
"string"
]
},
"fullTermEnds": {
"type": [
"null",
"string"
]
},
"fullTermStarts": {
"type": [
"null",
"string"
]
}
},
"type": [
"null",
"object"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"source": {
"type": [
"null",
"string"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"trimester": {
"type": [
"null",
"string"
]
},
"verdict": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}