Nursing specialty hub
General Medicine nursing calculators & guides
A navigation hub for general medical nursing calculations. It surfaces existing MedMaths calculators and guides without changing the underlying calculator pages.
Start with the task
What do you need to work out right now?
Choose the statement that matches the medication order, IV order or renal calculation in front of you.
I have an ordered mg dose. How many mL do I give?
Enter the prescribed dose and the strength shown on the medicine label.
I need to turn a dose into tablets
Use the prescribed dose and the strength of one tablet to calculate the tablet amount.
I have a volume and time. What mL/hr do I set?
Calculate the pump rate directly from the prescribed volume and infusion time.
My medicine reference asks for Cockcroft-Gault CrCl
Calculate adult creatinine clearance using the weight method specified by the reference.
General medicine calculator toolkit
Common ward calculations without hunting through the site
Everyday medication and IV calculations come first, with renal and laboratory arithmetic grouped underneath for fast access when needed.
Medication doses
Get from the order to the amount to give
Start here for liquid doses, tablets and weight-based liquid medication calculations.
mg to mL Calculator
Use this when
Use when the order is in mg and the liquid strength is in mg/mL or mg per X mL.
Open calculatorTablet Dose Calculator
Use this when
Use when a prescribed fixed or weight-based medicine dose must be converted into tablets using the exact one-tablet strength.
Open calculatormg/kg to mL Dose Calculator
Use this when
Use when a liquid medicine order is written in mg/kg per dose or mg/kg/day and weight is documented in kg or lb.
Open calculatorIV fluids
Set the ordered pump rate
Use volume and prescribed time to calculate mL/hr without adding a drop-factor step when a pump is being used.
Renal function
Use the renal estimate named by the reference
Keep Cockcroft-Gault CrCl and CKD-EPI eGFR separate so the clinical source determines which result is required.
Creatinine Clearance Calculator
Use this when
Specific-method calculator for sources that explicitly require Cockcroft-Gault CrCl and a defined weight method.
Open calculatoreGFR Calculator (CKD-EPI 2021)
Use this when
Modern adult renal-function pathway for eGFR and medication-related workflows when the governing source uses CKD-EPI.
Open calculatorLab arithmetic
Calculate the reported laboratory values
Get the arithmetic result quickly, then interpret it in the patient context rather than treating the calculator as a diagnosis.
Corrected Calcium Calculator
Use this when
Use when reproducing or interpreting an albumin-adjusted calcium value; a 2026 international laboratory position statement recommends against routine laboratory reporting of corrected calcium.
Open calculatorCorrected Sodium Calculator
Use this when
Use when a current source asks for a Katz or Hillier hyperglycaemia-adjusted sodium estimate from measured sodium and glucose.
Open calculatorAnion Gap Calculator
Use this when
Use when you need the potassium-free anion-gap arithmetic, with optional albumin adjustment, for comparison with the reporting laboratory reference interval.
Open calculatorBrowse by calculation type
Calculation topics used in General Medicine
These topic hubs group the same calculators by calculation type. Use them when you want to move from this specialty view into the wider MedMaths calculation pathway.
Calculation topic
Dose Calculations
Start with the medication order and label: find mL from mg, mg/kg, or units without pre-calculating the answer first.
Open topic hubCalculation topic
IV Fluids & Infusions
Choose by the answer you need: pump rate in mL/hr, gravity drops/min, infusion duration, or a check of an existing drip.
Open topic hubCalculation topic
Renal Dosing Support
Start with modern CKD-EPI 2021 eGFR or use Cockcroft-Gault CrCl when a current source specifically requires it.
Open topic hubCalculation topic
Lab Calculators & Corrections
Laboratory calculation tools for corrected calcium, corrected sodium, anion gap, serum osmolality and osmol gap.
Open topic hubLearning
Related MedMaths guides
eGFR vs CrCl: which renal function estimate should you use?
Understand how CKD-EPI eGFR and Cockcroft-Gault CrCl differ, why their values may not match, and how to follow the estimate and units required by the current source.
How to interpret the anion gap
Interpret the anion gap after calculation: local reference interval, albumin, GOLDMARK, DKA limitations, normal-gap acidosis and low or negative gaps.
Corrected sodium in hyperglycaemia: what the number means
Why high glucose can lower measured sodium, what a corrected sodium estimate represents, why Katz and Hillier differ, and what the number cannot tell you on its own.
IV Volume, Time and Rate Explained
Understand how IV volume, time and mL/hr fit together, why the same formula can solve for rate, volume or time, and how to handle minutes, remaining volume and common unit mistakes.
Use the calculator guidance for each clinical situation
Specialty grouping is designed to help you find tools faster. Always follow the guidance on the individual calculator page, medication references, local policy, and clinical review requirements.