Calculate your estimated due date from the first day of your last period. Get trimester dates and important pregnancy milestones. Everything runs locally in your browser — nothing is uploaded.
Calculate the day number of the year for any date. Find out which day of 365 (or 366) a specific date represents.
Divides total sales-and-marketing spend by the number of new customers acquired in the same period to produce a blended acquisition cost. Startups and growth teams use CAC to evaluate marketing channel efficiency, optimize ad spend, and benchmark against LTV.
Find out what day of the week any date falls on. Look up birthdays, holidays, historical events, and future dates.
Find the ISO week number for any date. Also shows the day of the week and the current week of the year.
Add or subtract days from any date. Get the resulting date instantly — useful for deadlines, scheduling, and planning.
Pregnancy Due Date Calculator lets you calculate your estimated due date from the first day of your last period. Get trimester dates and important pregnancy milestones. Everything runs locally in your browser — nothing is uploaded.. It works on any device with a modern web browser.
Calculate your estimated due date from the first day of your last period. Get trimester dates and important pregnancy milestones. Everything runs locally in your browser — nothing is uploaded. It runs entirely in your browser — no software installation or data uploads required.
Direct text entry, file upload, or URL-based input — depending on the tool. All numeric values are entered through input fields with real-time updates.
Yes. After the initial page load, Pregnancy Due Date Calculator runs entirely on your device with no internet connection needed. All processing is done locally.
Yes, this tool is completely free with no usage limits, registration, or credit card required.
All processing happens locally in your browser. Your data is never uploaded to any server.
Yes. After the initial page load, the tool runs entirely offline without requiring an internet connection.
No. You can use this tool unlimited times with no quotas or restrictions.
Any modern web browser (Chrome, Firefox, Safari, Edge) on desktop or mobile. No installation needed.
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