Free tools
Tools for clinics
Quick, free utilities for running a clinic: GST and compliance for the admin, plus deterministic clinical calculators that score published, cited instruments. No signup, no catch. Clinical tools print the published score; they do not decide care.
Billing, GST & compliance
GST calculator
Add or extract GST on any amount, or build a multi-line itemised bill, and see the exact CGST + SGST or IGST split at the 5/12/18/28% slabs.
Open tool →Clinic licence checker
Answer a few questions and get a personalised checklist of the registrations your clinic likely needs. Save, print, or copy it.
Open tool →GST registration checker
Answer five questions for a hedged read on whether your clinic likely needs GST registration. Healthcare is mostly exempt, but not always.
Open tool →Tax invoice vs bill of supply
Enter mixed lines (an exempt consultation plus taxable medicine) and get two print-ready specimens: a tax invoice and a bill of supply.
Open tool →Compliance & renewal calendar
Enter your own licence and registration renewal dates and get a sorted timeline with a 90-day urgency band, a printable view, and a calendar (.ics) export.
Open tool →Clinical calculators
Due date & gestational age
Estimate the due date (EDD) and gestational age from the LMP by Naegele's rule, with a dating-scan mode, trimester, and a printable worksheet. Dating arithmetic only.
Open tool →APGAR score
Tally the five newborn signs at 1, 5, and 10 minutes for the total and band, with a printable worksheet. For the record, not a disposition.
Open tool →Bishop score
Score the five cervical-exam findings for the published Bishop favourability band, with a printable worksheet. Scores favourability; management stays with you.
Open tool →WHO Simplified Partogram
Plot cervical dilation, fetal descent, contractions, and vitals on the standard WHO Simplified Partograph (1994) grid with Alert and Action line detection. A labour chart, not a clinical decision.
Open tool →Amsel criteria
Count the four Amsel findings against the ≥3-of-4 threshold for bacterial vaginosis. Documents the count; it does not diagnose.
Open tool →Alvarado score
Tally the eight Alvarado (MANTRELS) findings for the appendicitis likelihood band, with the rule-out caveat, and a printable worksheet. Likelihood band only.
Open tool →Wells score (DVT & PE)
Tally the Wells criteria for DVT or PE for the pre-test probability band (two-tier and three-tier). Pre-test probability; never orders imaging.
Open tool →CURB-65 score
Tally the five CURB-65 criteria for the pneumonia severity score and 30-day mortality band. Severity banding for a patient already under assessment.
Open tool →Centor / McIsaac score
Score the modified Centor (McIsaac) criteria for the published likelihood of Group A strep in a sore throat. Likelihood only; no antibiotic advice.
Open tool →Glasgow Coma Scale (GCS)
Score best Eye, Verbal, and Motor responses for the GCS total, the E_V_M breakdown, and the severity band. Published scale totals, bedside judgment unchanged.
Open tool →CHA₂DS₂-VASc score
Tally the seven risk factors for the atrial-fibrillation stroke-risk score and its published annual-risk percentage. Risk number only; no anticoagulation recommendation.
Open tool →HEART score
Score History, ECG, Age, Risk factors, and Troponin for the published MACE risk band in chest pain. Risk band for the chart, not admit/discharge instructions.
Open tool →Corrected QT (QTc)
Enter the measured QT and heart rate for the Bazett, Fridericia, Framingham, and Hodges QTc side by side, with the published prolongation thresholds. Corrected values only.
Open tool →Mean arterial pressure (MAP)
Enter systolic and diastolic for MAP = DBP + (SBP − DBP)/3 and the pulse pressure, with cited perfusion reference points. Bedside arithmetic that mirrors vitals MAP.
Open tool →eGFR & creatinine clearance
The 2021 race-free CKD-EPI eGFR with the KDIGO stage, plus Cockcroft-Gault creatinine clearance for context. Estimation for adults 18+; not a dosing tool.
Open tool →Corrected calcium (Payne)
Re-express a measured total calcium at a reference albumin with the Payne formula, in mg/dL or SI. Outputs the corrected value only, never a hypo/normal/hyper verdict.
Open tool →Serum anion gap
Compute the anion gap (Na − [Cl + HCO₃]), an optional K-inclusive variant, and the albumin-corrected gap, against a reference range you set. Worksheet math you control.
Open tool →Child-Pugh score
Score bilirubin, albumin, INR, ascites, and encephalopathy for the cirrhosis severity class (A/B/C). Severity class for known chronic liver disease.
Open tool →EPDS calculator
Score the 10-item Edinburgh Postnatal Depression Scale with reverse-scoring, both published cut-offs, and an item-10 self-harm flag. Screening totals with published cut-offs.
Open tool →PHQ-9 & GAD-7 calculator
Score the PHQ-9 and GAD-7 mental-health screens live, see the published severity band, flag item 9, and print a worksheet.
Open tool →BMI + BSA calculator
Enter height and weight to get BMI against both the WHO and Asian-Indian risk bands, plus body surface area by Mosteller and Du Bois.
Open tool →Ideal & adjusted body weight
Compute the Devine ideal body weight from sex and height, plus the adjusted body weight when actual weight is supplied. Reference weights only; no drug or dose.
Open tool →Paediatric dosing helper
Enter a child's weight and your own mg/kg to get the per-dose and per-day arithmetic, plus age-banded reference vitals. You supply the mg/kg; this only multiplies.
Open tool →Prefer a printable list? See the free checklists →