Adds 280 days (40 weeks) to a first-day-of-last-period date using a common rule-of-thumb. Ultrasound dating and provider judgment override this estimate.
* This is an estimate. Actual amounts may vary slightly based on input assumptions.
Adds 280 days (40 weeks) to a first-day-of-last-period date using a common rule-of-thumb. Ultrasound dating and provider judgment override this estimate.
Due Date Calculator (LMP) is built for people who want fast, reliable results without opening a spreadsheet or installing desktop software. The page centers on practical use around due date calculator: personal planning, business analysis, development work, or everyday tasks. The flow is simple: enter values, run the tool, and read the output with enough context to act. Logic is deterministic and inputs are validated so you can trust a first-pass answer before you dig deeper.
The logic for due date calculator (lmp) follows a clear formula: EDD ≈ LMP + 280 days (calendar). Inputs are validated before processing so empty, malformed, or out-of-range values do not turn into misleading numbers. That matters when you compare scenarios or share results with a team. Numeric tools keep units and percentages consistent; text and developer tools spell out parsing and formatting so errors are easy to spot and fix. Beginners get guardrails; experienced users get predictable behavior.
Most people looking for due date calculator want speed, accuracy, and a straight explanation. The "How to use" section gives a quick path in; the FAQs cover edge cases and common misunderstandings. When one tool is not enough, related tools point to converters, calculators, or validators that often sit in the same workflow so you can finish the job without starting over elsewhere.
If you are benchmarking, run several inputs and compare outputs side by side. That helps with planning, estimation, and what-if checks. Always confirm assumptions (tax rate, interest, baselines, time horizon) against your country, employer, or business rules before you finalize a decision. This due date calculator (lmp) stays free and responsive on desktop and mobile. Bookmark it if due date calculator shows up often in your week, and use related tools when the next step is a different calculation or format.
Instant response
Get output immediately with clean, readable breakdowns.
Accurate logic
Validated inputs and deterministic formulas for consistency.
Privacy friendly
Run calculations without sign-up or personal profile storage.
Cross-device ready
Optimized layout for mobile, tablet, and desktop workflows.
No. Only your maternity provider can confirm gestational age and due date.
It is a common 40-week convention from LMP; cycle length and ovulation vary.
LMP-based EDD is less reliable - rely on early ultrasound dating.
IVF often uses embryo transfer date or retrieval - ask your clinic for the official EDD.
Use ISO YYYY-MM-DD to avoid month/day confusion.
This due date calculator (lmp) uses a deterministic formula (EDD ≈ LMP + 280 days (calendar)) and validates invalid or out-of-range input before calculation.
Enter plain numeric values without commas for amounts and percentages. Use decimal points where required for precise output.
Yes. The calculator is responsive and optimized for mobile, tablet, and desktop with consistent output and UI behavior.
Date Difference Calculator
Calculate days, weeks, months between two dates.
Age Calculator
Calculate exact age from date of birth.
Anxiety Level Self-Assessment (GAD-7 style)
Seven questions with a 0–21 total and severity band - not a diagnosis.
Life Expectancy Calculator
Heuristic life expectancy, years left, and top lifestyle factors - wellness only.
BMI for Children Calculator
Compute BMI from height and weight with pediatric context notes.
Recipe Scaling Calculator
Scale ingredient amounts from original to desired servings.
Baking Ingredient Substitution Tool
Swap common baking ingredients with measured alternatives.
Cooking Time & Temperature Calculator
Roast time, oven temperature, and safe internal temp by meat type.
Open the full directory, browse your hub collection, or jump back to this category. Bookmark the page if you use it often.
