Unit Conversions
Fast unit conversion calculators for common clinical and everyday units — including mcg↔mg, g↔mg, L↔mL, kg↔lb, and °C↔°F.
Micrograms (mcg) ↔ Milligrams (mg)
Convert between micrograms and milligrams
Grams (g) ↔ Milligrams (mg)
Convert between grams and milligrams
Liters (L) ↔ Milliliters (mL)
Convert between liters and milliliters
Kilograms (kg) ↔ Pounds (lbs)
Convert between kilograms and pounds
Celsius (°C) ↔ Fahrenheit (°F)
Convert between Celsius and Fahrenheit
How Unit Conversions Work
Unit conversions express the same quantity in a different unit. Converting units keeps the quantity unchanged but changes how we label or communicate it. For example, 1,000 milligrams and 1 gram represent the same mass, just in different units.
The key to accurate conversion is knowing the conversion factor. For example, 1 mg = 1,000 mcg means that every 1,000 micrograms equals 1 milligram. Always check the original unit and the target unit before converting—unit mistakes can lead to tenfold or hundredfold errors in medication doses.
Common Unit Conversions Explained
Micrograms to milligrams (mcg to mg)
mcg is a smaller unit than mg. Converting mcg → mg helps standardise doses and documentation.
Example question
A label shows 500 micrograms (mcg). Convert this to milligrams (mg).
Worked example
Value = 500 mcg
Divide by 1,000
500 ÷ 1,000 = 0.5 mg
Answer: 0.5 mg
💡 mcg → mg: divide by 1,000.
Grams to milligrams (g to mg)
g is larger than mg. Converting g → mg avoids missed zeros and improves clarity.
Example question
A medication amount is written as 0.25 g. Convert this to mg.
Worked example
Value = 0.25 g
Multiply by 1,000
0.25 × 1,000 = 250 mg
Answer: 250 mg
💡 g → mg: multiply by 1,000.
Liters to milliliters (L to mL)
L and mL are common for IV fluids and volumes. Converting L → mL makes rates and totals easier to work with.
Example question
A volume is 1.5 L. Convert this to mL.
Worked example
Value = 1.5 L
Multiply by 1,000
1.5 × 1,000 = 1,500 mL
Answer: 1,500 mL
💡 L → mL: multiply by 1,000.
When These Calculators Are Used
- •Converting medication doses between units
- •Preparing IV medications and fluids
- •Interpreting laboratory results
- •Checking medication charts and orders
- •Verifying calculations during patient care
Clinical safety note
Always confirm converted values against medication orders and local clinical guidelines. These calculators support clinical decision-making but do not replace professional judgement.
Related Calculator Categories
Frequently Asked Questions
Clinical reminder: Always follow local protocols and consult medication information sheets. These examples are for calculation practice only.