UK due date, ovulation, pregnancy weeks and maternity pay calculators. Not medical advice.
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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.
The relevant date as YYYY-MM-DD: LMP, conception, or IVF transfer date.
Reference date YYYY-MM-DD for "weeks pregnant now" (default today).
Dating method (default lmp).
Embryo age in days at IVF transfer (commonly 3 or 5; default 5).
This tool isn't marked read-only, so it may change something on the server or in an account you connected.
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.
| Argument | Type | Description |
|---|---|---|
| asOf | string | Reference date YYYY-MM-DD for "weeks pregnant now" (default today). |
| date* | string | The relevant date as YYYY-MM-DD: LMP, conception, or IVF transfer date. |
| method | string | Dating method (default lmp). |
| embryoAge | number | Embryo age in days at IVF transfer (commonly 3 or 5; default 5). |
{
"type": "object",
"required": [
"date"
],
"properties": {
"asOf": {
"type": "string",
"description": "Reference date YYYY-MM-DD for \"weeks pregnant now\" (default today)."
},
"date": {
"type": "string",
"description": "The relevant date as YYYY-MM-DD: LMP, conception, or IVF transfer date."
},
"method": {
"enum": [
"lmp",
"conception",
"ivf"
],
"type": "string",
"description": "Dating method (default lmp)."
},
"embryoAge": {
"type": "number",
"description": "Embryo age in days at IVF transfer (commonly 3 or 5; default 5)."
}
},
"additionalProperties": false
}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.
| Argument | Type | Description |
|---|---|---|
| lastPeriod* | string | First day of last period as YYYY-MM-DD. |
| cycleLength | number | Average cycle length in days, 20 to 45 (default 28). |
{
"type": "object",
"required": [
"lastPeriod"
],
"properties": {
"lastPeriod": {
"type": "string",
"description": "First day of last period as YYYY-MM-DD."
},
"cycleLength": {
"type": "number",
"description": "Average cycle length in days, 20 to 45 (default 28)."
}
},
"additionalProperties": false
}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.
| Argument | Type | Description |
|---|---|---|
| annualSalary | number | Annual salary before tax (GBP), converted at /52. |
| weeklyEarnings | number | Average weekly earnings before tax (GBP). |
{
"type": "object",
"properties": {
"annualSalary": {
"type": "number",
"description": "Annual salary before tax (GBP), converted at /52."
},
"weeklyEarnings": {
"type": "number",
"description": "Average weekly earnings before tax (GBP)."
}
},
"additionalProperties": false
}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.
| Argument | Type | Description |
|---|---|---|
| lmp | string | First day of last period as YYYY-MM-DD. |
| asOf | string | Reference date YYYY-MM-DD (default today). |
| dueDate | string | Due date as YYYY-MM-DD (LMP is worked back as dueDate minus 280 days). |
{
"type": "object",
"properties": {
"lmp": {
"type": "string",
"description": "First day of last period as YYYY-MM-DD."
},
"asOf": {
"type": "string",
"description": "Reference date YYYY-MM-DD (default today)."
},
"dueDate": {
"type": "string",
"description": "Due date as YYYY-MM-DD (LMP is worked back as dueDate minus 280 days)."
}
},
"additionalProperties": false
}