Pregnancy Due Dates in Sheets
Formula
The API calculates current pregnancy progress, trimesters, important milestones, and time remaining until due date with week-by-week breakdowns.
=VERVE("duedatecalculator", A2)=VERVE.CALL("duedatecalculator", A2)A2 holds the last_period you're looking up. Drag the formula down and each row resolves on its own.
With literal values
Nothing has to come from a cell — typed values work the same way.
=VERVE("duedatecalculator", "2025-06-01")Inputs
Required inputs are positional, in the order below. Everything else is passed as a "name", value pair after them — the same shape as SUMIFS.
| Input | Type | Where it goes | Description |
|---|---|---|---|
last_periodRequired | string | argument 2 | First day of last menstrual period (YYYY-MM-DD) (e.g. 2025-06-01) |
What lands in your sheet
With no "field" pair the formula spills the whole response as two columns — field name on the left, value on the right — starting at the cell you typed in. Make sure the cells below and to the right are empty.
Pulling one value
Add a "field" pair to get a single cell back instead of a table. The field name is the dot-path from the table below.
=VERVE("duedatecalculator", A2, "field", "calculation_method")=VERVE.CALL("duedatecalculator", A2, "field", "calculation_method")Available fields
#PREMIUM(field) rather than a value, so a locked field never looks like a real answer.| Use as "field" | Type | Example cell value | Description |
|---|---|---|---|
calculation_method | string | last_period | Method used for calculation: last_period or conception_date |
last_period_datePremium | string | 2024-01-01 | Estimated first day of last menstrual period |
estimated_conception_datePremium | string | 2024-01-15 | Conception date provided as input |
due_date | string | 2024-10-07 | Estimated delivery date in ISO format |
current_progress | object | {…} | How far along the pregnancy is today, in days and weeks |
current_progress.days_pregnantPremium | number | 715 | Total number of days pregnant |
current_progress.weeks_pregnantPremium | number | 102 | Number of complete weeks of pregnancy |
current_progress.days_into_weekPremium | number | 1 | Additional days beyond complete weeks |
current_progress.formattedPremium | string | 102 weeks, 1 days | Human-readable pregnancy duration with weeks and days |
current_progress.trimesterPremium | number | 3 | Current trimester number: 1, 2, or 3 |
current_progress.percentage_completePremium | number | 255.36 | Pregnancy completion percentage relative to due date |
time_until_due | object | {…} | How long until the due date, with a formatted summary |
time_until_due.daysPremium | number | 0 | Complete days remaining until due date |
time_until_due.weeksPremium | number | 0 | Complete weeks remaining until due date |
time_until_due.days_extraPremium | number | 0 | Additional days beyond complete weeks remaining |
time_until_due.formattedPremium | string | Past due date | Human-readable time remaining until delivery |
time_until_due.is_overduePremium | boolean | true | Whether pregnancy has passed the due date |
upcoming_milestonesPremium | array | [] | Array of upcoming pregnancy milestones and dates |
important_dates | object | {…} | Key milestones: the end of each trimester and viability |
important_dates.end_first_trimesterPremium | string | 2024-04-01 | Estimated end date of first trimester |
important_dates.end_second_trimesterPremium | string | 2024-07-08 | Estimated end date of second trimester |
important_dates.full_term_beginsPremium | string | 2024-09-16 | Date when pregnancy reaches full term status |
disclaimer | string | This is an estimate only. Due dates can vary. Consult your healthcare provider for medical advice. | Medical disclaimer about estimated due dates |
Filling a whole column
Hand the first argument a range instead of a cell and the add-in makes one batched call for the lot, then spills the answers down. That is faster than dragging the formula and costs the same credits — one per row looked up.
=VERVE("duedatecalculator", A2:A100, "field", "calculation_method")=VERVE.CALL("duedatecalculator", A2:A100, "field", "calculation_method")A2:A100 is the column of last_period values. The result spills down alongside it, one row per input, blanks skipped.
When a cell doesn't fill
A failed lookup returns readable text starting with #ERR rather than a spreadsheet error, because Excel cannot show a custom message on a real error — you would get a bare #VALUE! with no reason. The trade-off is that IFERROR() won't catch it; test with LEFT(cell, 4) = "#ERR" instead.
| Cell reads | What happened |
|---|---|
#ERR Not connected | No API key saved. Open the side panel and connect your account. |
#ERR Replace <name> with a cell or value | The preview formula was copied as-is. Swap the placeholder for a cell reference. |
#ERR No "x" in duedatecalculator | An option name that this source doesn't take. The message lists the ones it does. |
#ERR No data point "…" | The "field" path isn't in the response. Check the dot-path against the table above. |
#PREMIUM(field) | The field exists but your plan doesn't include it. |
#ERR Out of credits | The month's credits are spent. Usage resets on your billing date. |
Before the formula works
The add-in reads the API key you saved once in the side panel — the key never goes in the formula, so a shared sheet doesn't leak it and a collaborator without access simply sees the last calculated values.
- Install the add-in for Google Sheets or Excel.
- Open the side panel and sign in, or paste a key from your dashboard.
- Type the formula above into any cell.
Other ways to use Pregnancy Due Dates in Sheets
Set up Pregnancy Due Dates in Sheets on VerveSheets, or reach the same source a different way. Your VerveSheets account and credits work on all of them — one key, one balance.
Frequently asked questions
Does Pregnancy Due Dates in Sheets work in both Google Sheets and Excel?
Yes — the same source, the same arguments. Sheets calls it =VERVE("duedatecalculator", …) and Excel calls it =VERVE.CALL("duedatecalculator", …); that function name is the only difference.
Do the cells recalculate on their own?
They recalculate when the sheet does — on edit, on open, or on a manual recalc. Each recalculation is a fresh call and spends credits, so for a large static column it's worth copying the results and pasting them as values.
How many credits does a filled column cost?
1 credit per row looked up, whether you drag the formula or pass a range. The range form is one HTTP call instead of many, but the credit count is the same.
Can I share the sheet without sharing my key?
Yes. The key is stored against your account, not in the file. Collaborators see the values already in the cells; formulas only recalculate for someone who has connected their own account.
Why is a cell showing #ERR instead of an error?
So you can read the reason. Excel can't display a custom message on a real spreadsheet error, so the add-in returns the explanation as text on both platforms instead.