Step 1
Creatinine units
Creatinine Converter
Switch µmol/L and mg/dL.
Open toolStart from a goal
🧪 Understand a result
Unit converters and careful explainers, then speak to your GP
Use this journey to decode a number on a letter, then take it back to your GP. Call 999 if you feel very unwell.
Decode, do not diagnose
Convert units first, then read a band, then use the 111 or 999 chooser if you are unsure how urgent it is.
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Step 2
GFR estimate
GFR Calculator
A kidney function estimate from a blood test figure.
Open tool -
3
Step 3
HbA1c units
HbA1c Converter
mmol/mol and percent, conversion only.
Open tool -
4
Step 4
Blood pressure band
Blood Pressure Explainer
A common NHS-style band, not a diagnosis.
Open tool -
5
Step 5
111 or 999
111 or 999 Chooser
Emergency flags only. If unsure, call 999.
Open tool
All tools
Browse every calculator in this journey. The steps above are a suggested order.
Creatinine Converter
Convert creatinine between µmol/L and mg/dL.
Use calculatorGFR Calculator
Estimate kidney function from your blood test results.
Use calculatorHbA1c Converter
Convert mmol/mol and percentage HbA1c. Units only.
Use calculatorBlood Pressure Explainer
Place a reading in common NHS-style bands. Not a diagnosis.
Use calculator111 or 999 Chooser
Answer a few emergency-flag questions. If you are unsure, call 999.
Use calculatorResting Heart Rate
Place a resting pulse in a common adult discussion range.
Use calculatorAppointment Countdown
Count the days to a clinic or hospital date.
Use calculator