What is an insulin sliding scale (correction scale)?

A sliding scale—more precisely a correction scale—maps a measured blood glucose value to a fixed number of units of rapid-acting insulin (lispro, aspart, or glulisine in many hospitals). Nurses and patients read the row that contains the current glucose and give that many units in addition to any basal insulin and meal boluses already ordered. It is easy to print on a flow sheet but does not adjust for how sensitive you are to insulin unless the prescriber personalizes the numbers. It is not a complete diabetes program for most people with type 1 diabetes, who need basal + carb boluses + individualized correction factors or pump therapy.

How do I use this insulin sliding scale calculator?

Enter your capillary or CGM-calibrated glucose, choose mg/dL or mmol/L, and pick one of three teaching templates (conservative, standard, aggressive). The highlighted row shows suggested rapid-acting correction units when glucose is ≥70 mg/dL (≥3.9 mmol/L). At ≤69 mg/dL the tool shows zero correction units and hypoglycemia messaging. Example: 220 mg/dL on the standard template falls in 200–249 mg/dL → 4 units on this page’s standard chart. Only use numbers that match your signed order—templates here often differ from your hospital.

Why do conservative, standard, and aggressive templates give different units?

Insulin sensitivity varies with weight, activity, kidney function, steroids, illness, and prior doses. Conservative templates use wider glucose bands and smaller unit steps (280 mg/dL might land in 250–299 → 3 units here). Aggressive templates use narrower high bands and larger steps (280 mg/dL might land in 270–299 → 10 units here). Standard sits between them (220 mg/dL → 4 units; 280 mg/dL → 6 units). Real inpatient orders are often tuned to a patient’s correction factor (e.g. 1:50 meaning 1 unit per 50 mg/dL above target)—these tables are simplified teaching examples.

Does this calculator include basal insulin or meal-time carbs?

No. Basal insulin (glargine, detemir, degludec, NPH) runs in the background. Meal boluses use an insulin-to-carbohydrate ratio (for example 1 unit per 10 g carb). This tool estimates only the correction component from glucose alone. Total rapid-acting insulin at a meal might be meal bolus + correction if both are ordered—stacking rules and maximum doses come from your prescriber.

What should I do if glucose is below 70 mg/dL (3.9 mmol/L)?

Do not give correction insulin for hypoglycemia. Treat with 15 g fast-acting carbohydrate (glucose tablets, juice), recheck in 15 minutes, repeat if still low, and use glucagon injection or nasal glucagon if prescribed for severe lows. ≤54 mg/dL (3.0 mmol/L) is severe—may need emergency help if unable to swallow or not responding. Repeated lows require clinician review of basal doses, meal boluses, or activity.

How does mmol/L convert on this calculator?

mmol/L is multiplied by 18 to approximate mg/dL for band matching (common bedside rule). Example: 12.2 mmol/L × 18 ≈ 220 mg/dL → same row as entering 220 mg/dL directly. Some regions report mmol/L exclusively; always document the unit your care team uses. CGM apps may show both.

Can I use this instead of my hospital or home insulin order?

No. Legal and safe care requires following the scale written by your prescriber or institution, including insulin brand, route, maximum correction per dose, hold parameters (NPO, hypoglycemia), and recheck timing (often every 2–4 hours on floors). Using a different template because “it looks close” risks hypo- or hyperglycemia.

What is insulin stacking and why does timing matter?

Rapid-acting insulin peaks in about 1–3 hours. Giving correction doses every hour without waiting for prior insulin to work can stack and cause late hypoglycemia. Many protocols require a minimum interval (e.g. 2–4 hours) or a cap on units per 4 hours. This calculator does not track prior doses—only the current glucose row.

What about insulin pumps and automated insulin delivery?

Pump and hybrid closed-loop users typically apply an insulin sensitivity factor (correction factor) and target glucose in the device rather than paper bands. Automated systems adjust basal temporarily. This page targets injection and inpatient flow-sheet teaching, not pump settings programming.

When does very high glucose need urgent care or DKA evaluation?

Persistent glucose ≥250–300 mg/dL with vomiting, abdominal pain, rapid breathing, dehydration, confusion, or positive ketones—especially in type 1 diabetes or during illness—may signal diabetic ketoacidosis or hyperosmolar states needing emergency care, IV fluids, and insulin protocols—not only more correction from a home scale. This tool flags ≥350 mg/dL for heightened caution but cannot rule out DKA.

Who should avoid sliding-scale-only diabetes management?

Outpatient guidelines generally prefer basal insulin plus meal boluses (or pump therapy) over correction-only regimens for stable type 1 and many type 2 patients on insulin, because scales react late and may not match sensitivity. Inpatient care sometimes uses scales temporarily, but discharge plans should transition to structured regimens when possible.

Is this insulin sliding scale calculator medical advice?

No. Educational templates for learning and comparison. Insulin errors can be fatal—verify every dose with your order, diabetes educator, or nursing protocol.

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Diabetes & inpatient education

Insulin Sliding Scale Calculator

Map blood glucose to rapid-acting correction insulin units using conservative, standard, or aggressive teaching templates. Enter mg/dL or mmol/L; see zero units for hypoglycemia and cautions for very high glucose. Not basal insulin, carb boluses, or your hospital order—educational only. More on our medical calculators hub.

Last updated: June 4, 2026

Three full correction-scale tables on page

Hypoglycemia and hyperglycemia safeguards

Live band highlight in the calculator

Insulin sliding scale

Correction dose from glucose band—educational templates only

Current blood glucose

Unit

Scale template

Scale table (Standard template)

Glucose (mg/dL)	Units
70 – 149	0
150 – 199	2
200 – 249	4
250 – 299	6
300 – 349	8
350+	10

220 mg/dL

Suggested correction: 4 units

Band: 200 – 249 mg/dL

Using the standard template, glucose falls in the 200 – 249 mg/dL row. Many protocols use rapid-acting insulin (e.g. lispro, aspart, glulisine) for correction doses.

Confirm this matches your written order. Do not stack correction doses too closely together; follow your prescribed recheck interval.

Not a medical order

Sliding scales vary by hospital and prescriber. Basal insulin, meal boluses, sick-day rules, pregnancy, and pump therapy are not modeled here. Use only rapid-acting insulin types specified in your own instructions.

Example correction doses (from calculator logic)

220 mg/dL standard

4 units

200 – 249 mg/dL

280 mg/dL compare

Conservative: 3 u · Aggressive: 10 u

65 mg/dL

0 units

Treat hypoglycemia

12.2 mmol/L

4 units

~220 mg/dL

Full teaching scales (mg/dL) — all three templates

Conservative

Glucose (mg/dL)	Correction units
≤69	0 — treat hypoglycemia
70 – 149	0
150 – 199	1
200 – 249	2
250 – 299	3
300 – 349	4
350+	6

Standard

Glucose (mg/dL)	Correction units
≤69	0 — treat hypoglycemia
70 – 149	0
150 – 199	2
200 – 249	4
250 – 299	6
300 – 349	8
350+	10

Aggressive

Glucose (mg/dL)	Correction units
≤69	0 — treat hypoglycemia
70 – 149	0
150 – 179	2
180 – 209	4
210 – 239	6
240 – 269	8
270 – 299	10
300+	12

All templates assign 0 units for glucose ≤69 mg/dL. Rows apply to rapid-acting correction insulin teaching only.

Basal vs meal bolus vs correction

Component	Role	This tool
Basal (long-acting) insulin	Background insulin between meals and overnight	Not calculated here
Meal bolus (rapid-acting)	Covers carbohydrates (insulin-to-carb ratio)	Not calculated here
Correction (rapid-acting)	Lowers high glucose toward target	This sliding scale estimates correction units only

Hypoglycemia before correction insulin

Glucose	Action (summary)
≤54 mg/dL (≤3.0 mmol/L)	Severe hypoglycemia—glucagon if available, emergency services if unresponsive; no correction insulin
55–69 mg/dL (3.1–3.8 mmol/L)	15 g fast carbs, recheck in 15 min; repeat; consider glucagon per plan
≥70 mg/dL (≥3.9 mmol/L)	Eligible for correction row on scale (if not otherwise held)

Calculator features

Correction-only

Rapid-acting units from glucose bands—inpatient flow-sheet style teaching.

Dual units

mmol/L × 18 → mg/dL for row matching.

Hypo first

≤69 mg/dL suppresses correction dose.

When to seek urgent care (possible DKA / severe illness)

•Blood glucose often very high (e.g. >250–300 mg/dL) with type 1 or illness
•Nausea, vomiting, abdominal pain
•Rapid breathing, fruity breath odor
•Dehydration, confusion, or inability to keep fluids down
•Positive blood or urine ketones when checked

References

Insulin errors can cause severe hypoglycemia or DKA. Double-check every dose against your written order. Call emergency services for unresponsive low glucose or suspected DKA symptoms.

Frequently Asked Questions

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Diabetes & inpatient education

Insulin Sliding Scale Calculator

Last updated: June 4, 2026

Three full correction-scale tables on page

Hypoglycemia and hyperglycemia safeguards

Live band highlight in the calculator

Insulin sliding scale

Correction dose from glucose band—educational templates only

Current blood glucose

Unit

Scale template

Scale table (Standard template)

Glucose (mg/dL)	Units
70 – 149	0
150 – 199	2
200 – 249	4
250 – 299	6
300 – 349	8
350+	10

220 mg/dL

Suggested correction: 4 units

Band: 200 – 249 mg/dL

Using the standard template, glucose falls in the 200 – 249 mg/dL row. Many protocols use rapid-acting insulin (e.g. lispro, aspart, glulisine) for correction doses.

Confirm this matches your written order. Do not stack correction doses too closely together; follow your prescribed recheck interval.

Not a medical order

Example correction doses (from calculator logic)

220 mg/dL standard

4 units

200 – 249 mg/dL

280 mg/dL compare

Conservative: 3 u · Aggressive: 10 u

65 mg/dL

0 units

Treat hypoglycemia

12.2 mmol/L

4 units

~220 mg/dL

Full teaching scales (mg/dL) — all three templates

Conservative

Glucose (mg/dL)	Correction units
≤69	0 — treat hypoglycemia
70 – 149	0
150 – 199	1
200 – 249	2
250 – 299	3
300 – 349	4
350+	6

Standard

Glucose (mg/dL)	Correction units
≤69	0 — treat hypoglycemia
70 – 149	0
150 – 199	2
200 – 249	4
250 – 299	6
300 – 349	8
350+	10

Aggressive

Glucose (mg/dL)	Correction units
≤69	0 — treat hypoglycemia
70 – 149	0
150 – 179	2
180 – 209	4
210 – 239	6
240 – 269	8
270 – 299	10
300+	12

All templates assign 0 units for glucose ≤69 mg/dL. Rows apply to rapid-acting correction insulin teaching only.

Basal vs meal bolus vs correction

Component	Role	This tool
Basal (long-acting) insulin	Background insulin between meals and overnight	Not calculated here
Meal bolus (rapid-acting)	Covers carbohydrates (insulin-to-carb ratio)	Not calculated here
Correction (rapid-acting)	Lowers high glucose toward target	This sliding scale estimates correction units only

Hypoglycemia before correction insulin

Glucose	Action (summary)
≤54 mg/dL (≤3.0 mmol/L)	Severe hypoglycemia—glucagon if available, emergency services if unresponsive; no correction insulin
55–69 mg/dL (3.1–3.8 mmol/L)	15 g fast carbs, recheck in 15 min; repeat; consider glucagon per plan
≥70 mg/dL (≥3.9 mmol/L)	Eligible for correction row on scale (if not otherwise held)

Calculator features

Correction-only

Rapid-acting units from glucose bands—inpatient flow-sheet style teaching.

Dual units

mmol/L × 18 → mg/dL for row matching.

Hypo first

≤69 mg/dL suppresses correction dose.

When to seek urgent care (possible DKA / severe illness)

•Blood glucose often very high (e.g. >250–300 mg/dL) with type 1 or illness
•Nausea, vomiting, abdominal pain
•Rapid breathing, fruity breath odor
•Dehydration, confusion, or inability to keep fluids down
•Positive blood or urine ketones when checked

References

Insulin errors can cause severe hypoglycemia or DKA. Double-check every dose against your written order. Call emergency services for unresponsive low glucose or suspected DKA symptoms.