Gravity drip rate in drops per minute plus pump rate in mL per hour.
You enter: Volume to infuse · Infusion time · Drip set factor
Example: 31.25 gtt/min; 125 mL/hr.
Open IV Drip Rate →
Convert a supplied Snellen-style numerator and denominator into a decimal acuity ratio and logMAR value.
You enter: Test distance numerator · Smallest readable line denominator
Example: Decimal ratio =1; logMAR =0.
Open Visual Acuity Ratio Scenario Calculator →
Estimate total time represented by a selected number of sleep cycles using a supplied cycle length.
You enter: Number of cycles · Minutes per cycle
Example: Total =450 minutes =7.5 hours.
Open Ninety-Minute Sleep Cycle Time Calculator →
Estimate remaining caffeine from an initial amount, half-life, and elapsed time using exponential decay arithmetic.
You enter: Initial amount · Half-life in hours · Elapsed hours
Example: Remaining amount ≈65.9754 mg; eliminated ≈134.0246 mg.
Open Caffeine Remaining Amount Calculator →
Normalize a clock phase after a supplied time shift across a 24-hour cycle.
You enter: Starting clock hour · Phase shift in hours
Example: Normalized phase =6:00.
Open Circadian Phase Shift Arithmetic Calculator →
Convert a supplied cholesterol value between mg/dL and mmol/L using the conventional factor.
You enter: Cholesterol value · Conversion direction
Example: Converted value ≈5.172 mmol/L.
Open Cholesterol Unit Conversion Calculator →
Sum eight supplied 0-to-3 item responses and calculate the mean response.
You enter: Item 1 score · Item 2 score · Item 3 score · Item 4 score · Item 5 score · Item 6 score · Item 7 score · Item 8 score
Example: Total =8; mean =1.
Open Eight-Item Sleepiness Score Sum Calculator →
Calculate glycemic load from carbohydrate grams, glycemic index, and number of servings.
You enter: Available carbohydrate per serving · Glycemic index · Number of servings
Example: Load per serving =16.5; total load =33.
Open Glycemic Load Scenario Calculator →
Calculate accumulated difference between a supplied nightly sleep need and actual sleep over multiple nights.
You enter: Target hours per night · Actual hours per night · Number of nights
Example: Per-night difference =1.5 hours; accumulated debt =7.5 hours.
Open Sleep Debt Arithmetic Calculator →
Estimate available ambient-equivalent gas and duration from cylinder water capacity, gauge pressures, ambient pressure, and a stated flow rate.
You enter: Cylinder water capacity · Starting gauge pressure · Reserve gauge pressure · Ambient absolute pressure · Stated flow rate
Example: The idealized usable gas is about 1,775.36 L at ambient pressure, giving about 887.68 minutes or 14.79 hours at 2 L/min; this is not a clinical recommendation.
Open Oxygen Cylinder Duration Estimate →
Calculate an ankle-brachial index from ankle systolic pressure and the higher of two entered brachial pressures.
You enter: Ankle systolic pressure · Right brachial systolic pressure · Left brachial systolic pressure
Example: The higher brachial pressure is 120 mmHg, so ABI = 100 ÷ 120 = 0.8333.
Open Ankle-Brachial Index Calculator →
Estimate alveolar oxygen pressure with the simplified alveolar gas equation and subtract arterial oxygen pressure to calculate the A–a gradient.
You enter: Inspired oxygen concentration · Barometric pressure · Water-vapor pressure · Arterial carbon-dioxide pressure · Respiratory quotient · Arterial oxygen pressure
Example: Estimated PAO₂ is 99.73 mmHg and the A–a gradient is 4.73 mmHg.
Open Alveolar–Arterial Oxygen Gradient Calculator →
Calculate the potassium-excluded anion gap from serum sodium, chloride, and bicarbonate values.
You enter: Serum sodium · Serum chloride · Serum bicarbonate
Example: Chloride plus bicarbonate is 128 mEq/L, so the potassium-excluded anion gap is 12 mEq/L.
Open Anion Gap Calculator →
Calculate the AST-to-platelet ratio index from AST, the laboratory’s AST upper limit of normal, and platelet count.
You enter: AST activity · AST upper limit of normal · Platelet count
Example: AST/ULN is 2.05× and APRI is (2.05×100)÷90 = 2.2778.
Open APRI Liver Fibrosis Index Calculator →
Calculate the arithmetic ratio of aspartate aminotransferase to alanine aminotransferase and show the supporting difference and shares.
You enter: AST activity · ALT activity
Example: AST/ALT = 80÷40 = 2; AST is 66.67% and ALT is 33.33% of the combined entered activity.
Open AST/ALT Ratio Calculator →
Add five post-anesthesia recovery domains into a transparent 0–10 Aldrete score worksheet with the component points kept visible.
You enter: Activity · Respiration · Circulation compared with pre-anesthetic baseline · Consciousness · Oxygenation
Example: 1 + 1 + 2 + 2 + 2 = 8 points; the page marks the score as at or above the reference line.
Open Aldrete Post-Anesthesia Recovery Score Worksheet →
Calculate an apnea–hypopnea index from scored apnea events, hypopnea events, and the stated sleep or recording duration.
You enter: Apnea events · Hypopnea events · Sleep or recording duration
Example: AHI = (12 + 18) ÷ 6 = 5 events per hour.
Open Apnea–Hypopnea Index (AHI) Calculator →
Estimate effective aortic valve area from LVOT diameter, LVOT velocity-time integral, and aortic valve velocity-time integral.
You enter: LVOT diameter · LVOT velocity-time integral · Aortic valve velocity-time integral
Example: LVOT area = 3.1416 cm², stroke volume = 62.832 mL, effective AVA = 0.7854 cm².
Open Aortic Valve Area by Continuity Equation →
Record seven subjective pet-wellbeing domains on a 1–10 scale and review the total, average, lowest domain, and good-day balance.
You enter: Hurt and comfort · Hunger and eating · Hydration · Hygiene and ability to stay clean · Happiness and engagement · Mobility · More good days than bad
Example: Total = 53/70, average = 7.57/10, lowest domain = 7, and more good days than bad is selected.
Open Cat Quality-of-Life HHHHHMM Worksheet →
Convert counted small and large ECG paper boxes into seconds and milliseconds for a selected 25 or 50 mm/s paper speed.
You enter: Paper speed · Small boxes · Large boxes
Example: At 25 mm/s, one small box is 0.04 s and one large box is 0.20 s; 5 small boxes plus 1 large box equals 0.40 s.
Open ECG Boxes to Seconds Calculator →
Calculate an absolute neutrophil count from the white blood cell count and mature neutrophil percentage when bands are intentionally excluded from the entered differential.
You enter: White blood cell count · Mature neutrophils
Example: ANC without bands = 5.5 × 0.55 = 3.025 ×10⁹/L = 3,025 cells/µL.
Open Absolute Neutrophil Count Without Bands Calculator →
Add the eight scored Alvarado/MANTRELS findings and show the transparent ten-point total without turning a screening score into a diagnosis.
You enter: Pain migration to the right lower quadrant · Anorexia or loss of appetite · Nausea or vomiting · Right-lower-quadrant tenderness · Rebound tenderness · Fever or elevated temperature finding · Leukocytosis · Neutrophil left shift
Example: Alvarado score = 1 + 1 + 1 + 2 + 1 + 1 + 2 + 1 = 10 points out of 10.
Open Alvarado Appendicitis Screening Score Calculator →
Normalize urine albumin and creatinine units and calculate the spot urine albumin-to-creatinine ratio in mg albumin per gram creatinine.
You enter: Urine albumin concentration · Albumin unit · Urine creatinine concentration · Creatinine unit
Example: UACR = 30 mg/dL ÷ 0.1 g/dL = 300 mg/g.
Open Urine Albumin-to-Creatinine Ratio Calculator →
Add the five components of the traditional Bishop score—dilation, effacement, station, consistency, and position—for a documented cervical examination.
You enter: Cervical dilation · Cervical effacement · Fetal head station · Cervical consistency · Cervical position
Example: Full Bishop score = 2 + 2 + 2 + 1 + 1 = 8 points out of 13.
Open Full Bishop Score Calculator →
Add the five Beighton examination maneuvers as a transparent nine-point score, showing paired joint contributions and keeping age-specific interpretation separate.
You enter: Passive fifth-finger dorsiflexion beyond 90° · Thumb apposition to the flexor forearm · Elbow hyperextension beyond 10° · Knee hyperextension beyond 10° · Forward bend with knees straight and palms flat on the floor
Example: Beighton score = 2 + 2 + 2 + 2 + 1 = 9 points out of 9.
Open Beighton Hypermobility Score Calculator →
Add ten activities of daily living in a common 0–100 Barthel Index format and show the functional contributions without treating dependency bands as universal rules.
You enter: Feeding · Bathing · Personal grooming · Dressing · Bowel control · Bladder control · Toilet use · Bed-to-chair transfers · Mobility on level surface · Stairs
Example: Barthel Index = 10 + 5 + 5 + 10 + 10 + 10 + 10 + 15 + 15 + 10 = 100 points.
Open Barthel Index Calculator →
Calculate the six-question BASDAI symptom score from 0–10 responses, showing the first-four sum and the morning-stiffness average separately.
You enter: Q1 — Fatigue or tiredness over the recall period · Q2 — Neck, back, or hip pain · Q3 — Pain or swelling in other joints · Q4 — Tenderness or discomfort to touch/pressure · Q5 — Severity of morning stiffness · Q6 — Duration of morning stiffness
Example: BASDAI = [2 + 2 + 1 + 1 + (3 + 3)/2] ÷ 5 = 2.20 out of 10.
Open BASDAI Symptom Score Calculator →
Add the component points of the 15-point Brief Interview for Mental Status structure while keeping the screening result separate from diagnosis.
You enter: Three-word repetition after the first attempt · Year orientation · Month orientation · Day-of-month orientation · Delayed recall: word 1 · Delayed recall: word 2 · Delayed recall: word 3
Example: BIMS = 3 + 3 + 2 + 1 + 2 + 2 + 2 = 15 points.
Open Brief Interview for Mental Status (BIMS) Score Calculator →
Calculate stroke volume and left-ventricular ejection fraction from end-diastolic and end-systolic volumes, with the result kept separate from an echocardiography diagnosis.
You enter: End-diastolic volume (EDV) · End-systolic volume (ESV)
Example: Stroke volume = 72 mL; ejection fraction = (72 ÷ 120) × 100 = 60%.
Open Ejection Fraction Calculator →
Estimate absolute eosinophil count from the total white-cell count and eosinophil percentage, showing both laboratory units and a cautious reference context.
You enter: Total white-cell count · Eosinophils
Example: AEC = 8 × 2.5 ÷ 100 = 0.2 ×10⁹/L, or 200 cells/µL.
Open Absolute Eosinophil Count Calculator →
Estimate cardiac index from cardiac output and body surface area, or derive cardiac output from heart rate and stroke volume before indexing it.
You enter: How should cardiac output be supplied? · Cardiac output · Heart rate · Stroke volume · Body surface area
Example: Cardiac index = 5 ÷ 1.9 = 2.6316 L/min/m².
Open Cardiac Index Calculator →
Add ten already-scored Edinburgh Postnatal Depression Scale item values while keeping safety follow-up separate from a screening total.
You enter: Item 1 scored points · Item 2 scored points · Item 3 scored points · Item 4 scored points · Item 5 scored points · Item 6 scored points · Item 7 scored points · Item 8 scored points · Item 9 scored points · Item 10 scored points
Example: EPDS total = 10 points out of 30; item 10 = 0 points.
Open EPDS Scored Total Calculator →
Add the documented sore-throat findings and choose the classic Centor or age-adjusted McIsaac model for a transparent screening score.
You enter: Scoring model · Age · Fever documented above 38 °C · Cough absent · Tonsillar swelling or exudate documented · Tender anterior cervical nodes documented
Example: McIsaac score = 1 + 1 + 0 + 0 + 0 age adjustment = 2 points.
Open Centor and McIsaac Score Calculator →
Calculate the documented CHA₂DS₂-VASc stroke-risk score with visible age, prior-stroke, vascular-disease, and sex-category points.
You enter: Age · Sex category used by the score · Heart failure or left-ventricular dysfunction documented · Hypertension documented · Diabetes mellitus documented · Previous stroke, TIA, or thromboembolism · Vascular disease documented
Example: CHA₂DS₂-VASc = 0 points for the supplied example inputs.
Open CHA₂DS₂-VASc Score Calculator →
Calculate the five-point CURB-65 structure from confusion, urea, respiratory rate, blood pressure, and age while keeping disposition decisions with clinicians.
You enter: Age · New confusion documented · Blood urea above 7 mmol/L · Respiratory rate · Systolic blood pressure · Diastolic blood pressure
Example: CURB-65 = 0 points for the supplied example inputs.
Open CURB-65 Pneumonia Severity Score Calculator →
Calculate the absolute neutrophil count from the white-cell count, segmented neutrophils, and bands while keeping units and interpretation boundaries visible.
You enter: White blood cell count · Segmented neutrophils · Band neutrophils
Example: ANC = 5,000 × (55 + 1) ÷ 100 = 2,800 cells/µL.
Open Absolute Neutrophil Count (ANC) Calculator →
Estimate albumin-adjusted total calcium with the classic Payne equation while showing why ionized calcium and local laboratory methods still matter.
You enter: Measured total calcium · Serum albumin
Example: Adjusted calcium = 8.5 − 3.0 + 4.0 = 9.5 mg/dL.
Open Albumin-Adjusted Calcium (Payne Formula) Calculator →
Calculate the BUN-to-creatinine ratio in conventional or SI laboratory units and show the normalized values used in the comparison.
You enter: Laboratory unit system · BUN or urea value · Creatinine value
Example: BUN/creatinine ratio = 14 ÷ 1 = 14.
Open BUN-to-Creatinine Ratio Calculator →
Estimate cardiac output and cardiac index from oxygen consumption and arterial-venous oxygen content difference using the Fick principle.
You enter: Oxygen consumption (VO₂) · Arterial oxygen content (CaO₂) · Mixed-venous oxygen content (CvO₂) · Body surface area
Example: A 5 mL/dL oxygen difference gives cardiac output 5.00 L/min and cardiac index 2.78 L/min/m².
Open Fick Cardiac Output Calculator →
Estimate a dog’s remaining years from an entered age and a user-supplied lifespan range without presenting a breed or health prognosis.
You enter: Current dog age · Lower lifespan assumption · Upper lifespan assumption
Example: At 5 years old, the simple range is 3 to 11 remaining years, with a 12-year midpoint assumption.
Open Dog Life-Expectancy Range Calculator →
Compare recurring disposable-product costs with the monthly equivalent of a reusable option using your own prices and care assumptions.
You enter: Periods per month · Disposable units per period · Disposable cost per unit · Other disposable cost per period · Reusable upfront cost · Reusable service life · Reusable care cost per period
Example: Disposable monthly cost is 7 currency units; reusable monthly equivalent is 1.75, so the simple monthly difference is 5.25 and break-even against recurring care is about 4.62 months.
Open Menstrual Product Cost Comparison Calculator →
