GALAXY OF TOOLS

CLINICAL SECTOR · 30 TOOLS

Free Medical Calculators for Healthcare Professionals

IV drip rate, dose by weight, eGFR, QTc, clinical scores and conversions for professionals. 30 free tools, no sign-up.

Infusions & dosing maths9

mg to mL CalculatorTurn a dose in mg into the mL to draw up from mg/mL, mg per 5 mL, % or 1:1,000 strengths — with a cap.Medical CalculatorsDosage Calculator (D/H × Q) with Practice QuestionsDesired over have times quantity, worked by dimensional analysis — plus seeded practice questions with full answers.Medical CalculatorsInsulin Units to mL ConverterConvert insulin units to mL, or mL to units, for U-40, U-100, U-200, U-300 and U-500 strengths.Medical CalculatorsBody Surface Area CalculatorBody surface area in m² by Mosteller, DuBois, Haycock, Gehan-George and Boyd from height and weight, metric or imperial.Medical CalculatorsIV Drip Rate CalculatorDrops per minute and mL/h from volume, time and the giving set’s drop factor (10, 15, 20 or 60 drops/mL).Medical CalculatorsMaintenance Fluid CalculatorHourly and daily maintenance fluid by weight: Holliday–Segar 100/50/20, the 4-2-1 rule and NICE adult ranges.Medical CalculatorsOxygen Cylinder Duration CalculatorMinutes of oxygen left from gauge pressure and flow, by cylinder factor (D, E, G, H), water capacity or label.Medical CalculatorsHeparin Drip CalculatorWeight-based heparin bolus and infusion maths from your own protocol values: units/kg, units/h and mL/h.Medical CalculatorsParkland Formula Calculator24-hour burn fluid (4 mL × kg × %TBSA), half in the first 8 h from the time of burn, with hourly rates.Medical Calculators

Kidney, liver & labs10

LDL Cholesterol CalculatorCalculated LDL-C from total cholesterol, HDL and triglycerides by three published equations, in mg/dL or mmol/L.Medical CalculatorseGFR CalculatorRace-free eGFR by CKD-EPI 2021 from creatinine (mg/dL or µmol/L), with cystatin C options and the KDIGO G stage.Medical CalculatorsCreatinine Clearance Calculator (Cockcroft-Gault)Cockcroft-Gault CrCl with actual, ideal and adjusted body weight, serum creatinine in mg/dL or µmol/L.Medical CalculatorsCorrected Calcium CalculatorAlbumin-adjusted total calcium in mg/dL or mmol/L by the common 0.8 formula, Payne’s original, or your lab’s equation.Medical CalculatorsAnion Gap CalculatorAnion gap from sodium, chloride and bicarbonate (or total CO₂), with potassium, albumin correction and delta ratio.Medical CalculatorsSerum Osmolality CalculatorCalculated serum osmolality, osmolal gap with an ethanol term, and the theoretical osmolarity of IV fluids.Medical CalculatorsSodium Correction CalculatorGlucose-corrected sodium by Katz (1.6) and Hillier (2.4), plus the Adrogué–Madias change per litre and correction rate.Medical CalculatorsMELD Score CalculatorMELD 3.0, MELD-Na and original MELD with the OPTN bounds and dialysis rule, labs in US or SI units.Medical CalculatorsChild-Pugh Score CalculatorChild-Pugh points and class from bilirubin, albumin, INR or prothrombin time, ascites and encephalopathy.Medical CalculatorsFree Water Deficit CalculatorFree water deficit from sodium, weight and body water, with glucose-corrected sodium and Adrogué–Madias.Medical Calculators

Clinical scores8

ASCVD Risk Calculator10-year risk of a first heart attack or stroke from the 2013 ACC/AHA Pooled Cohort Equations, in mg/dL or mmol/L.Medical CalculatorsMean Arterial Pressure CalculatorMAP from systolic and diastolic pressure in mmHg or kPa, with pulse pressure and two published alternative formulas.Medical CalculatorsCHA2DS2-VASc Score CalculatorCHA₂DS₂-VASc stroke risk score in atrial fibrillation, with the ESC 2024 CHA₂DS₂-VA and the older CHADS₂.Medical CalculatorsGlasgow Coma Scale CalculatorScore eye, verbal and motor responses, record NT when intubated, add pupils for GCS-P, or use the paediatric scale.Medical CalculatorsQTc CalculatorCorrected QT from QT and heart rate or RR interval by four formulas side by side, with AHA/ACCF/HRS cut-offs.Medical CalculatorsCURB-65 CalculatorCURB-65 and CRB-65 from confusion, urea or BUN, respiratory rate, blood pressure and age, with NICE risk bands.Medical CalculatorsWells Score Calculator (DVT and PE)Wells criteria for deep-vein thrombosis and pulmonary embolism, with two- and three-level probability bands.Medical CalculatorsBurn TBSA Calculator (Rule of Nines & Lund-Browder)Tap the body chart to estimate % total body surface area burned, by rule of nines or the Lund–Browder chart by age.Medical Calculators

Obstetrics & paediatrics3

Corrected Age Calculator (Premature Babies)Corrected (adjusted) age, postmenstrual age and due date for a baby born early, from birth date and gestation.Medical CalculatorsAPGAR Score CalculatorScore a newborn on the five Apgar signs at 1, 5 and later minutes, with the AAP/ACOG interpretation bands.Medical CalculatorsBishop Score CalculatorScore the cervix for labour induction: Bishop 1964, modified (cervical length) and the 3-item simplified score.Medical Calculators

Published formulas and clinical scores, with the source on every page

For healthcare professionals and students. Check results against your local protocols and clinical judgement; these tools do not give medical advice. Every calculator uses the formula or score from its original publication or the issuing guideline, cites it with a DOI, converts SI and conventional units with exact factors and warns when an input is outside the usual range. For bedside arithmetic there is the IV drip rate calculator, the insulin units to mL converter for every pen and vial strength, the heparin drip calculator driven by your own protocol, the maintenance fluid calculator and the oxygen cylinder duration calculator.

Kidney and liver tools include the eGFR calculator with the race-free CKD-EPI 2021 equations, creatinine clearance (Cockcroft-Gault), the MELD, MELD-Na and MELD 3.0 calculator and the Child-Pugh score. Fluids and electrolytes are covered by the anion gap calculator, serum osmolality and osmolal gap calculator, sodium correction calculator, free water deficit calculator and corrected calcium calculator.

Clinical scores include CURB-65, the Glasgow Coma Scale with GCS-P, the Wells score for DVT and PE, CHA2DS2-VASc, the ASCVD 10-year risk, the APGAR score, the Bishop score and QTc with four correction formulas.

Burns, cardiology and paediatrics

How these calculators are built

  • Sources first. Each page names the original paper or guideline, with its DOI and the date it was checked, and quotes interpretation bands only where the source states them.
  • No defaults that act as advice. Dosing tools start empty, take only the values from your own protocol, and never suggest a drug dose.
  • Health tools for everyone else. General calculators such as BMI, calorie and pregnancy dates are in the health and fitness sector.

Medical Calculators: frequently asked questions

Who are these medical calculators for?

Doctors, nurses, pharmacists and students who already know how to apply the result. They check arithmetic and published scores; they do not diagnose, and they do not replace local protocols or clinical judgement.

Where do the formulas come from?

From the original publications or the guidelines that define them, such as Cockcroft and Gault for creatinine clearance, CKD-EPI 2021 for eGFR, NICE for CURB-65 and the Glasgow Structured Approach for GCS. Each page cites its sources with DOIs.

Do the tools store patient data?

No. Everything runs in your browser and nothing you type is sent anywhere. Do not enter patient-identifiable information.

Which units can I use?

Both SI and conventional units, for example µmol/L or mg/dL for creatinine and mmol/L or mg/dL for glucose and cholesterol, using exact conversion factors that are shown on the page.

Can I use these for animals?

Most human formulas do not apply to animals. Where a page mentions pets, it says to ask your vet.