Baby Percentile Calculator
The Baby Percentile Calculator shows where a child ranks for weight, length or height, and head circumference compared with international reference data. A percentile is a position on a distribution from 0 to 100. For example, the 90th percentile for length means the child is longer than 90 percent of same-age peers. Intended for healthy infants and children; for premature or clinical cases, consult a clinician.
Open Baby Percentile Calculator
- Age in days, weeks, months, or years
- Sex as recorded at birth
- Weight in kilograms or pounds
- Length or height in centimeters or inches
- Head circumference in centimeters or inches
Inputs
- Percentiles for weight, length or height, and head circumference
- Z scores when available
- Interpretation guide for growth categories
Outputs
- Use trends across multiple measurements rather than a single point
- Percentiles reflect relative position, not a diagnosis
- Large shifts across major percentile lines may merit a clinician review
Interpretation
- Routine growth tracking between pediatric visits
- Preparation for checkups with organized values
- Comparison of measurements captured at home and in the clinic
Use cases
HCG Doubling Time Calculator
The HCG Calculator estimates how quickly beta HCG rises between two blood tests. Enter two HCG values with their dates and optional times to calculate doubling time, percent increase, and daily growth rate. Results are informational only and are not a diagnosis.
- First beta HCG value in mIU/mL
- Date and optional time of first test
- Second beta HCG value in mIU/mL
- Date and optional time of second test
Inputs
- Doubling time in hours
- Percent increase between tests
- Daily growth rate
- Context against typical early pregnancy rise ranges
Outputs
- HCG alone cannot date a pregnancy or confirm location
- Expected rise depends on starting level; rises often slow as levels increase
- Use serial tests from the same lab method when possible
Interpretation
- Tracking clinician ordered beta HCG tests
- Monitoring early progression after IVF or IUI
- Preparing results to discuss with your healthcare provider
Use cases
Blood Alcohol Content Calculator
The BAC Calculator estimates blood alcohol concentration over time using common formulas. Results are an estimate only. Many factors influence actual BAC, including body composition, food intake, and medications.
- Body weight
- Biological sex input for the distribution factor
- Number of standard drinks consumed
- Alcohol by volume or standard drink selection
- Elapsed time since first drink
Inputs
- Estimated BAC at a point in time
- Estimated time until BAC returns to zero
- Risk context relative to common legal limits
Outputs
- The estimate is not a legal or clinical measurement
- Only time reduces BAC
- Never use the result to decide if it is safe to drive
Interpretation
- Education on the effect of drink count over time
- Planning for a ride service rather than driving
- General awareness of alcohol elimination patterns