How many 50s in 85? (round down) 85 รท 50 = 1.7 โ 1 additional increment
4
Total insulin 2 + (1 ร 2) = 4 units
โ Give 4 units of insulin
โ ๏ธ Safety Alert
Never abbreviate "units" as "U" โ it can be mistaken for a zero! Always write out "units" completely.
๐ข Rounding Rules for Nursing
Knowing when and how to round is critical for patient safety. Different situations require different rounding rules.
โ ๏ธ The Golden Rule
When in doubt, do NOT round โ give the exact calculated amount when possible. Rounding should only be done when necessary for practical administration.
๐ Rounding Rules by Medication Type
Medication Type
Rounding Rule
Tablets
Round to nearest ยฝ tablet (if scored) or whole tablet
Oral Liquids
Round to nearest tenth (0.1 mL)
IV Fluids (pump)
Round to nearest whole number (mL/hr)
IV Drip (manual)
Round to nearest whole drop (gtt/min)
Insulin
Round to nearest whole unit (NEVER give partial units)
Heparin
Round to nearest whole unit
Pediatric doses
Round to nearest hundredth (0.01 mL) โ BE PRECISE!
High-alert meds
Do NOT round โ use exact calculation
๐ How to Round: The 5 Rule
Standard Rounding (โฅ5 round UP, <5 round DOWN)
If the digit is 5 or greater โ Round UP
If the digit is less than 5 โ Round DOWN
๐ Rounding to Whole Numbers
31.4
4 < 5, round DOWN
= 31
31.5
5 โฅ 5, round UP
= 32
31.7
7 โฅ 5, round UP
= 32
๐ Rounding to Tenths (1 decimal place)
2.43
3 < 5, round DOWN
= 2.4 mL
2.47
7 โฅ 5, round UP
= 2.5 mL
2.45
5 โฅ 5, round UP
= 2.5 mL
๐ Rounding to Hundredths (2 decimal places) โ Pediatrics
0.333
3 < 5, round DOWN
= 0.33 mL
0.667
7 โฅ 5, round UP
= 0.67 mL
0.125
5 โฅ 5, round UP
= 0.13 mL
๐ฅ Real-World Examples
๐ IV Pump Rate
Calculated rate: 83.33 mL/hr What do you set the pump to?
1
IV pumps accept whole numbers only 83.33 โ look at .3
2
3 < 5, so round DOWN 83.33 โ 83 mL/hr
โ Set pump to 83 mL/hr
๐ Oral Liquid Medication
Calculated dose: 7.83 mL How much do you give?
1
Oral liquids round to tenths 7.83 โ look at .03
2
3 < 5, so round DOWN 7.83 โ 7.8 mL
โ Give 7.8 mL
๐ Insulin Dose
Calculated dose: 6.7 units How many units do you give?
1
Insulin is ALWAYS whole units 6.7 โ look at .7
2
7 โฅ 5, so round UP 6.7 โ 7 units
โ Give 7 units
๐ Manual IV Drip
Calculated rate: 24.6 gtt/min What drip rate do you count?
1
Can't count partial drops! 24.6 โ look at .6
2
6 โฅ 5, so round UP 24.6 โ 25 gtt/min
โ Count 25 drops per minute
๐ก NCLEX Tip
On the NCLEX, if a question asks for a specific decimal place (like "round to the nearest tenth"), follow those instructions exactly. If no rounding instruction is given, use the rules above based on medication type.
Pediatric/neonatal doses โ be as precise as possible
When the answer is already a whole number or clean decimal
Critical care drips where small differences matter
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