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Clinical Estimates calculators
Clinical Estimates calculators: Educational estimates for kidney function and blood alcohol concentration. The category holds 9 tools, including the GFR Calculator, the BAC Calculator and the Creatinine Clearance Calculator.
GFR and Creatinine Clearance estimate kidney function from a blood test, Mean Arterial Pressure summarizes blood pressure and Cholesterol (LDL) calculates LDL from a lipid panel. Pregnancy Week, Ovulation, Period and IVF Due Date track reproductive dates from a starting date. Use them to understand a number you already have, and take any result to a clinician. Start with the test result in hand.
Among the tools here are GFR Calculator, BAC Calculator, Creatinine Clearance Calculator, Ovulation Calculator, Pregnancy Week Calculator, Cholesterol (LDL) Calculator, Mean Arterial Pressure Calculator, IVF Due Date Calculator, and 1 more that follow the same pattern of formula, worked example, limits and sources.
Pick one below. Open it.
GFR Calculator
Estimate kidney function (eGFR) from creatinine, age and sex using the 2021 CKD-EPI equation.
Open calculator →02BAC Calculator
Estimate blood alcohol concentration from drinks, body weight and elapsed time using the Widmark formula.
Open calculator →03Creatinine Clearance Calculator
Estimate creatinine clearance from age, weight and serum creatinine using the Cockcroft-Gault equation.
Open calculator →04Ovulation Calculator
Estimate the ovulation date, fertile window and next period from your last period and cycle length.
Open calculator →05Pregnancy Week Calculator
Find how many weeks and days pregnant you are from the first day of your last period.
Open calculator →06Cholesterol (LDL) Calculator
Estimate LDL, non-HDL cholesterol and the total-to-HDL ratio from a standard lipid panel.
Open calculator →07Mean Arterial Pressure Calculator
Calculate mean arterial pressure and pulse pressure from a blood pressure reading.
Open calculator →08IVF Due Date Calculator
Estimate a due date from an embryo transfer date and the age of the embryo at transfer.
Open calculator →09Period Calculator
Predict the next three period start dates from the last period and your cycle length.
Open calculator →Every tool, one table
Clinical Estimates calculators at a glance
Each row shows the headline figure that calculator returns at its own worked-example inputs.
| Calculator | What it answers | Headline output | Worked example |
|---|---|---|---|
| GFR Calculator | A single reading does not diagnose kidney disease. Trends and a clinician's review matter more. | Estimated GFR (mL/min/1.73m²) | 94.6 |
| BAC Calculator | Never use this to judge whether it is safe to drive. Individual metabolism varies and the estimate can be wrong in either direction. | Estimated blood alcohol concentration | 0.055% |
| Creatinine Clearance Calculator | Read alongside eGFR: the two equations estimate related but not identical measures of kidney function. | Estimated creatinine clearance (mL/min) | 101.7 |
| Ovulation Calculator | Use it to plan around a regular cycle, and confirm timing with a test if the result matters. | Estimated ovulation date | September 15, 2026 |
| Pregnancy Week Calculator | Match the week to the milestones your clinician tracks, then defer to their dating if it differs. | Completed weeks | 20 |
| Cholesterol (LDL) Calculator | Read a panel alongside your clinician's targets, which depend on your history. | Estimated LDL (mg/dL) | 120 |
| Mean Arterial Pressure Calculator | Understand a reading in one number, then let a clinician interpret it. | Mean arterial pressure (mmHg) | 93.3 |
| IVF Due Date Calculator | Plan around a due date counted from the transfer, and expect your clinic's dating to be the final word. | Estimated due date | February 17, 2027 |
| Period Calculator | Plan around the expected dates, knowing that real cycles can vary by 2 to 3 days from month to month. | Next period | October 8, 2026 |
Where people go wrong with clinical estimates numbers
These are educational estimates that rely on formulas fitted to populations, so an individual can differ substantially. A kidney or cholesterol formula can be off in people with unusual muscle mass, diet or medication, and one reading says less than a trend across several. Ovulation and period predictions assume a regular cycle, and a due date is an average, since only a small share of babies arrive on it. Never use a calculator result to change medication or delay care. Estimates inform questions. Doctors give answers.
Definitions
Clinical Estimates terms
- Blood alcohol concentration (BAC) : glossary term
- The percentage of alcohol in the bloodstream, estimated by formula from drinks consumed, body weight, sex and elapsed time, or measured directly by breath or blood test.
- Glomerular filtration rate (GFR) : glossary term
- A measure of how well the kidneys filter blood. It is usually estimated from a blood creatinine level, age and sex. Direct measurement is rare.
- Serum creatinine : glossary term
- A waste product from muscle metabolism, measured in blood. Most eGFR equations use it as their primary input, because the kidneys are the main route it leaves the body.
- Standard drink : glossary term
- A reference serving containing a fixed amount of pure alcohol (14 grams in the United States), used to compare drinks of different type and size on a common basis.
Keep exploring
Related calculator categories
Next to the clinical estimates tools, these categories answer the questions that usually come up alongside them.
Common clinical estimates questions
Can a calculator replace a lab test or a doctor's visit?
No. It gives an educational estimate from the numbers you enter. Only a clinician can read them alongside your history, symptoms and other tests.
Why can a calculated value differ from what my lab reports?
A lab may measure directly where a formula estimates, use a different method or reference range, or round differently. When the two disagree, go with the lab and ask your clinician.
What is a normal range?
A range that most healthy people fall inside, usually the middle 95 percent of a reference group. Sitting just outside it is not automatically a problem, and sitting inside it is not a guarantee.
Is an estimated due date reliable?
Only a small share of babies arrive on the estimated date. Most arrive within a couple of weeks either side. So the date is a midpoint to plan around, not a deadline.
Is the fertile window the same every month?
No. Ovulation timing moves with stress, illness, travel and cycle length, so the window shifts from month to month, even for people with regular cycles.
What is the difference between LDL, HDL and non-HDL cholesterol?
LDL carries cholesterol out to tissues and is the main target for lowering. HDL carries it back toward the liver. Non-HDL is total minus HDL, and it counts every particle that can build up in arteries.
Does my blood pressure change through the day?
Yes. It is usually lower in sleep, rises on waking and moves with activity, stress, caffeine and posture. A few calm readings at the same time of day give a truer picture than one.
How is an IVF due date different from a regular one?
The conception date is known, so it counts from the transfer instead of the last period. The embryo's age at transfer sets the offset, and your clinic's dating takes priority over any calculator.
How far ahead can a period be predicted?
The next period is the most reliable estimate, and each one after it is less certain. Cycles vary by a few days, and the error adds up across several months.
People also ask
Clinical Estimates calculator questions
What does a GFR result mean?
It estimates how much blood the kidneys filter per minute, and a value below 60 for three months or more can indicate reduced kidney function.
How is mean arterial pressure calculated?
It is diastolic pressure plus one third of the difference between the systolic and diastolic values, and it reflects average pressure driving blood flow.
How is an LDL cholesterol value calculated?
The Friedewald estimate subtracts HDL and one fifth of triglycerides from total cholesterol, and it becomes unreliable when triglycerides are very high.