Free · Formula-based · Cited
Understand your blood test results
69 calculators, checkers and unit converters – the A1C calculator and chart, how to read a blood test, GFR levels, TSH levels, the BUN/creatinine ratio and more. Convert between US (mg/dL) and SI (mmol/L) units and see what the numbers mean, with sources for every formula.
Most-used tools
- A1C Calculator & A1C ChartCalculator
- How to Read a Blood TestCalculator
- BUN/Creatinine Ratio CalculatorCalculator
- TSH Levels Checker & ChartCalculator
- GFR Levels Chart & CKD Stage CheckerCalculator
- eGFR Calculator: Estimated GFRCalculator
- TDEE CalculatorCalculator
- Ovulation Calculator & Fertile WindowCalculator
- CBC Blood Test Results ExplainerCalculator
- High Creatinine Levels: Checker & GuideCalculator
- TIBC Blood Test & Iron Panel CalculatorCalculator
- Normal Respiratory Rate by AgeCalculator
🩸 Blood Sugar & A1C
A1C calculator and chart, GMI, blood sugar unit conversion, HbA1c mmol/mol, insulin and HOMA-IR tools.
🫘 Kidney
eGFR, GFR levels and CKD stages, high creatinine, BUN/creatinine ratio, creatinine clearance, uric acid and UACR tools.
- eGFR Calculator: Estimated GFRCalculator
- Creatinine Clearance CalculatorCalculator
- BUN/Creatinine Ratio CalculatorCalculator
- GFR Levels Chart & CKD Stage CheckerCalculator
- High Creatinine Levels: Checker & GuideCalculator
- Serum creatinine mg/dL ↔ µmol/LConverter
- Uric acid mg/dL ↔ µmol/LConverter
- BUN / urea mg/dL BUN ↔ mmol/L ureaConverter
- Urine albumin-to-creatinine ratio mg/g ↔ mg/mmolConverter
🦋 Thyroid
TSH levels checker and chart, free T4 and free T3 unit converters.
🧬 Hormones
Testosterone, free testosterone, estradiol, progesterone, cortisol, prolactin and DHEA-S converters.
💊 Iron & Vitamins
Low ferritin checker, TIBC and iron panel calculator, transferrin saturation, and vitamin D, B12, folate, ferritin and iron converters.
🔬 Blood Count
CBC results explainer, MCV calculator and hemoglobin unit converter.
⚗️ Liver & Electrolytes
ALT (SGPT) checker, BMP explainer, anion gap, corrected calcium and sodium, osmolality, FIB-4 and mineral converters.
- Corrected Calcium CalculatorCalculator
- Anion Gap CalculatorCalculator
- Corrected Sodium CalculatorCalculator
- Serum Osmolality CalculatorCalculator
- FIB-4 CalculatorCalculator
- BMP Blood Test (Basic Metabolic Panel) ExplainerCalculator
- ALT (SGPT) Blood Test CheckerCalculator
- Calcium mg/dL ↔ mmol/LConverter
- Magnesium mg/dL ↔ mmol/LConverter
- Phosphate mg/dL ↔ mmol/LConverter
- Bilirubin mg/dL ↔ µmol/LConverter
- Albumin g/dL ↔ g/LConverter
🫀 Heart & Cholesterol
QTc calculator, respiratory rate by age, LDL, non-HDL and cholesterol ratio calculators plus lipid unit converters.
🏃 Body & Fitness
TDEE calculator, BMI calculator, BMI for men and a daily calorie calculator.
🤰 Pregnancy
Due date calculator and calendar, and an ovulation and fertile-window calculator.
📊 Unit Converters & Charts
How to read a blood test, all-in-one lab converter, mg/dL ↔ mmol/L and µmol/L, mEq to mg, dosage calculator, NBME lab values and a normal lab values chart.
Why AskDr?
Published formulas only
Every calculator uses a peer-reviewed equation (CKD-EPI 2021, ADAG, GMI, Mifflin-St Jeor, NIH/Sampson, Fridericia, FIB-4) and every converter an exact molar-mass factor. Reference ranges come from guidelines and the NBME reference values.
Both unit systems
Results in US conventional and SI units side by side, so a report from any country makes sense.
Private by design
Calculations run in your browser. We never store the values you enter.