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BabyData pregnancy calculators

by babydata.co.uk · remote · no sign-in to list tools · v1.0.0 · published by uk.co.babydata

UK due date, ovulation, pregnancy weeks and maternity pay calculators. Not medical advice.

Final · 1Changes · 3
CompareRegistry entry

4 tools: 1 do something that can't be undone and 3 change things.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http pregnancy-calculators https://babydata.co.uk/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

4 tools

Can't be undone 1Claude Code: ask
  • maternity_payEstimate UK Statutory Maternity Pay over the 39 weeks under gov.uk rules: 90% of average weekly earnings for 6 weeks, then the lower of the statutory flat rate or 90%.No findings

    Why it is in this group

    • The name "maternity_pay" says "pay": a word that usually means money moves, which cannot be taken back.
    Description, as the server wrote it
    Estimate UK Statutory Maternity Pay over the 39 weeks under gov.uk rules: 90% of average weekly earnings for 6 weeks, then the lower of the statutory flat rate or 90%. Uses the 2026-27 gov.uk flat rate of £194.32 a week, which changes each April. Estimate only, not advice.
Changes things 3Claude Code: ask
  • calculate_due_dateEstimate a pregnancy due date and current stage using Naegele's rule, from the last menstrual period (LMP), conception date, or an IVF embryo-transfer date.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Estimate a pregnancy due date and current stage using Naegele's rule, from the last menstrual period (LMP), conception date, or an IVF embryo-transfer date. Returns the estimated due date, weeks pregnant now, trimester and weeks remaining. Informational only, not medical advice.
  • calculate_ovulationEstimate the likely ovulation day, the fertile window and the next period from the first day of the last period and the average cycle length.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Estimate the likely ovulation day, the fertile window and the next period from the first day of the last period and the average cycle length. Informational only.
  • pregnancy_weeksWork out how many weeks and days pregnant someone is, the trimester and progress through the 40 weeks, from either the LMP or the due date.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Work out how many weeks and days pregnant someone is, the trimester and progress through the 40 weeks, from either the LMP or the due date. Informational only, not medical advice.

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http pregnancy-calculators https://babydata.co.uk/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [],
    "ask": [
      "mcp__pregnancy-calculators__calculate_due_date",
      "mcp__pregnancy-calculators__calculate_ovulation",
      "mcp__pregnancy-calculators__pregnancy_weeks",
      "mcp__pregnancy-calculators__maternity_pay"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as pregnancy-calculators. Review it before you use it.