Reasoning GP · Calculators
GP calculators: 60 clinical scores and tools
Each calculator has its own page saying what it is for, what you enter, how the result is read and which sources it cites. The working calculators are free and need no account.
60
calculators
19
clinical areas
£0
free, no account
Open the calculators
All of them are on one page with a search box and filters by clinical area. Tick the boxes or enter the values and the result appears with its reading.
The calculators are free. The trial opens the protocols and pathways they link to.All calculators by clinical area
Cardiovascular
- CHA₂DS₂-VAScStroke risk score in non-valvular AF.
- HAS-BLEDMajor bleeding risk on anticoagulation for AF.
- ORBITAlternative bleeding risk score for AF — may outperform HAS-BLED.
- QRISK3 (10-year CV risk)Predicts 10-year risk of MI / stroke. Proprietary algorithm. For education and practice only. For patient care, use the QRISK3 tool built into your clinical system (NICE NG238).
- ABCD₂ (TIA stroke risk)Risk of stroke after TIA within 7 days.
- QTc (Bazett)Heart-rate-corrected QT interval.
VTE
- Wells' score — PEPre-test probability of pulmonary embolism.
- Wells' score — DVTPre-test probability of deep vein thrombosis.
- PERC rule (PE rule-out)Rule-out criteria for PE in low pre-test probability.
Respiratory
- CRB-65Community-acquired pneumonia severity for primary care.
- FeverPAIN (sore throat)Likelihood of streptococcal sore throat.
- Centor (sore throat)Alternative streptococcal probability score.
- CURB-65CAP severity where urea is available (hospital / nursing-home).
- MRC Dyspnoea ScaleBreathlessness grade (1–5) — disability, not lung function.
- COPD Assessment Test (CAT)Health-status impact of COPD (8 items, 0–40).
- RCP 3 Questions (asthma control)Quick asthma morbidity screen (3 yes/no).
- Smoking pack-yearsCumulative tobacco exposure.
Acute / sepsis
Mental health
- PHQ-9 (depression)Depression severity over the last 2 weeks (9 items, 0–27).
- GAD-7 (anxiety)Generalised anxiety severity over the last 2 weeks (7 items, 0–21).
- AUDIT-C (alcohol screen)Brief alcohol-use screen (3 items, 0–12).
- AUDIT (full, 10-item)Detailed alcohol-use disorder screen (0–40).
- PHQ-2 (depression screen)Two-item depression case-finding (0–6).
- GAD-2 (anxiety screen)Two-item anxiety case-finding (0–6).
- Whooley questions (depression)Two-question depression case-finding (Whooley; NICE CG91).
- Edinburgh Postnatal Depression ScalePerinatal depression screen (10 items, 0–30).
- SCOFF (eating disorder screen)Five-question eating-disorder case-finding.
- Alcohol units calculatorUK units from volume and strength.
Sleep
- Epworth Sleepiness ScaleDaytime sleepiness score (8 items, 0–24).
- STOP-BANG (OSA risk)OSA risk score (8 yes/no items, 0–8).
Renal / metabolic
- eGFR (CKD-EPI 2009)Estimated GFR — CKD-EPI 2009 creatinine equation without the ethnicity adjustment (as used by UK laboratories).
- Creatinine clearance (Cockcroft-Gault)Estimated creatinine clearance (Cockcroft-Gault formula).
- BMI + waist:height ratioBody mass index and central adiposity.
- Corrected (adjusted) calciumAlbumin-adjusted serum calcium.
- Kidney Failure Risk Equation (KFRE, 4-variable)2- and 5-year risk of kidney failure needing dialysis or transplant, from age, sex, eGFR and urine ACR.
Bone
- FRAX (10-year fracture risk)WHO 10-year probability of major osteoporotic / hip fracture.
- QFracture (10-year fracture risk)UK fracture risk calculator — one of the two tools named in NICE NG259 (FRAX or QFracture at 40–90; QFracture only at 30–39).
Urology
- IPSS (BPH symptom score)International Prostate Symptom Score — 7 items 0–5.
- PSA age-specific thresholdAge-specific PSA thresholds as used by NICE NG12 (reference table).
Nutrition
Rheumatology
Cognition
- 6-CIT (cognitive screen)6-item cognitive impairment test — NICE NG97 first-line.
- MMSE / MoCA / ACE-IIIDetailed cognitive assessments — paper-administered.
- 4AT (delirium / cognition)Rapid delirium + cognitive screen (0–12).
- AMT-10 (Abbreviated Mental Test)Ten-item cognitive screen (each correct = 1).
Diabetes / endocrine
- HbA1c converter (IFCC DCCT)Convert HbA1c mmol/mol % and estimate average glucose.
- QDiabetes (10-yr T2DM risk)Predicts 10-year risk of type 2 diabetes. Proprietary algorithm.
Gastro / hepatology
- FIB-4 (liver fibrosis)Non-invasive fibrosis estimate in MASLD / chronic liver disease.
- Glasgow-Blatchford score (upper GI bleed)Pre-endoscopy risk score for acute upper gastrointestinal bleeding.
Frailty
- Rockwood Clinical Frailty ScaleGlobal frailty judgement (1–9).
- PRISMA-7 (frailty screen)Seven-item frailty case-finding.
Women's / obstetric
- PUQE (nausea/vomiting of pregnancy)Severity of nausea & vomiting in pregnancy (3 items, 3–15).
- EDD & gestational age (from LMP)Estimated due date and current gestation from the last menstrual period (Naegele’s rule).
- Gestational age (from EDD)Current gestation and trimester from a known estimated due date (e.g. the dating-scan EDD).
MSK / pain
- Ottawa ankle & foot rulesWhether an ankle/foot X-ray is needed after injury.
- Oral morphine equivalent (OME)Oral morphine equivalent — the conversion factors, as a reference card (no dose is calculated here).
- Keele STarT Back screening toolStratifies low back pain into low, medium or high risk of poor prognosis (9 items).
Paediatrics
- Corrected age (prematurity)Chronological and corrected age for an infant born preterm.
- Fever in under 5s — NICE NG143 traffic-light checkerTick the features present; shows the highest traffic-light band reached and the NICE NG143 position. No drugs or doses.
Trauma / head injury
How these pages are written
The pages in this list are built from the same data file that drives the working calculators, so the inputs, the bands and the sources you read here are the ones the calculator uses. When a calculator is corrected, its page changes with it.
Scores are aids. Several have age limits or populations they were not validated in, and some national guidance has moved away from using a score on its own. Where that is the case the calculator says so in its own wording.
Frequently asked questions
Are the calculators free?
Yes. The working calculators open without an account, and so do the pages in this list.
Where do the thresholds come from?
Each calculator names its sources, usually the NICE guideline that uses the score and the paper that first published it. The sources are listed on each calculator’s page.
Why are QRISK3, FRAX and some others not calculated here?
Some scores use proprietary or regularly updated algorithms. For those we explain what the score is for and link to the official tool. For patient care, use the version built into your clinical system.
Can I rely on a result for a patient?
A score supports a decision; it does not make one. Check the inputs, read the source, and use clinical judgement. The calculators are an educational reference for qualified clinicians.
Related
For qualified clinicians. Educational reference: it supports, and does not replace, clinical judgement, current national guidance and the tools in your clinical system.