WardRound

For healthcare professionals. Educational tool only — not a medical device. Verify all results against the current BNF, NICE guidance and local policy, and apply clinical judgement.

Clinical calculators

Fast, evidence-linked tools for everyday prescribing and risk estimation. Every calculator shows its formula, primary citation, UK (NICE/BNF) practice note and caveats.

Use these inside a patient review

The review portal runs these calculations against the whole record — renal function, drug chart, labs and trends — instead of one number at a time. Anonymous, browser-only.

Renal

Creatinine Clearance (Cockcroft–Gault)

Estimates creatinine clearance for drug dosing from age, sex, weight and serum creatinine, with actual, ideal or adjusted body weight options.

Renal
Pharmacy

eGFR — CKD-EPI 2021 (race-free creatinine)

Estimates GFR using the 2021 CKD-EPI creatinine equation, refitted without a race coefficient (ASN/NKF recommendation in the US).

Renal

eGFR — CKD-EPI 2009 (creatinine)

Estimates GFR using the original 2009 CKD-EPI creatinine equation — the basis of eGFR reported by UK laboratories.

Renal

eGFR — MDRD (4-variable, IDMS)

Estimates GFR using the 4-variable MDRD Study equation re-expressed for standardised (IDMS-traceable) creatinine. Largely superseded by CKD-EPI.

Renal

eGFR — Revised Schwartz (bedside, paediatric)

Estimates GFR in children aged 1–16 years from height and serum creatinine (revised 'bedside' Schwartz equation, 2009).

Renal
Paediatrics

Risk scores

NEWS2 (National Early Warning Score 2)

The Royal College of Physicians' aggregate score for detecting deterioration in acutely ill adults — the NHS standard.

Risk scores
Acute medicine

CURB-65 — pneumonia severity

Stratifies severity of community-acquired pneumonia to guide site-of-care and antibiotic decisions (NICE NG250).

Risk scores
Respiratory

Glasgow Coma Scale

Standardised assessment of consciousness level from eye, verbal and motor responses (3–15).

Risk scores
Emergency

CHA₂DS₂-VASc — stroke risk in atrial fibrillation

Estimates annual stroke/thromboembolism risk in non-valvular atrial fibrillation to guide anticoagulation decisions.

Risk scores
Cardiology

HAS-BLED — bleeding risk on anticoagulation

Estimates major bleeding risk in patients with atrial fibrillation considered for anticoagulation, highlighting modifiable risk factors.

Risk scores
Cardiology

ORBIT — bleeding risk in AF

Estimates bleeding risk in atrial fibrillation patients considered for anticoagulation — the score NICE NG196 prefers.

Risk scores
Cardiology

Conversions

Corticosteroid Equivalence Conversion

Converts between oral corticosteroids using standard anti-inflammatory equivalence (hydrocortisone 20 mg basis).

Conversions
Endocrine

Opioid Conversion & Morphine Milligram Equivalents (MME)

Calculates total daily morphine milligram equivalents (CDC 2022 factors) and unadjusted equianalgesic doses between oral opioids.

Conversions
Pain

Benzodiazepine Equivalence Conversion (diazepam equivalents)

Converts between benzodiazepines and Z-drugs using approximate diazepam equivalents (Ashton Manual basis).

Conversions
Psychiatry

Electrolytes

Sodium Correction Rate (Adrogué–Madias)

Predicts the change in serum sodium per litre of infusate and the infusion rate needed to achieve a safe correction target in hyponatraemia.

Electrolytes
Renal

Endocrine

Levothyroxine Initial Dose (weight-based)

Estimates the initial levothyroxine dose for primary hypothyroidism: full weight-based replacement or low-dose initiation in elderly/cardiac patients.

Endocrine

Neurology

Phenytoin Correction for Hypoalbuminaemia (Sheiner–Tozer)

Estimates the albumin-corrected total phenytoin level using Sheiner–Tozer and its renal failure and critical illness variants.

Neurology
Pharmacy

Anaesthesia

Local Anaesthetic Maximum Dose

Calculates the weight-based maximum dose of common local anaesthetics, applying the lower of the weight-based limit and the absolute cap.

Anaesthesia

Neonatal

Glucose Infusion Rate (GIR)

Calculates the glucose infusion rate in mg/kg/min from dextrose concentration and infusion rate — a core neonatal/paediatric TPN and fluid calculation.

Neonatal
Paediatrics

Body size

Ideal & Adjusted Body Weight (Devine)

Calculates Devine ideal body weight and, when actual weight is provided, adjusted body weight for dosing in obesity.

Body size
Pharmacy

Body Mass Index (BMI)

Calculates BMI with WHO weight categories, plus the healthy weight range for the given height.

Body size

Body Surface Area (Mosteller & Du Bois)

Calculates body surface area using the Mosteller equation (UK standard) with the Du Bois equation for comparison.

Body size

Nutrition

Basal Energy Expenditure (Mifflin–St Jeor & Harris–Benedict)

Estimates resting/basal energy expenditure using the Mifflin–St Jeor equation (preferred) with the classic Harris–Benedict equation for comparison.

Nutrition