Insulin Sliding Scale Calculator
Generate a personalised ISF-based sliding scale reference table. Enter your ISF and target BG to see correction dose estimates across a range of blood glucose values. Educational use only.
📊 Sliding Scale Generator
Your Personalised Sliding Scale
Based on ISF = — mg/dL/unit, Target = — mg/dL. Does not include IOB — always subtract active insulin.
| Blood Glucose (mg/dL) | Correction Dose (units) | Expected BG After |
|---|
Doses rounded to nearest 0.5 unit. Values are estimates — verify with your care team.
About Sliding Scales
How This Table Is Generated
Each row uses the same formula as the correction dose calculator, applied to a range of BG values. A BG at or below target shows 0 units (no correction needed). The table pre-computes these values so you can look up your current BG and find the correction dose at a glance.
Sliding Scale vs Correction Dose Formula
These are mathematically equivalent when your ISF is accurate and stable. The sliding scale is more convenient for quick reference (especially in a hospital or when you cannot do the arithmetic). The formula is more flexible for any BG value and easier to update when your ISF changes. This generator lets you create a printed or saved reference from your verified ISF.
Traditional "reactive-only" sliding scales — where no basal or scheduled bolus is given, and insulin is only reacting to already-high BG — are not recommended by ADA. This tool generates an ISF-based correction table to supplement a proper basal-bolus regimen, not replace it.
Sources & References
- American Diabetes Association. Standards of Medical Care in Diabetes — 2024. Section 16 (Hospital). Link
- Umpierrez GE et al. "Management of Hyperglycemia in Hospitalized Patients in Non-Critical Care Setting." J Clin Endocrinol Metab. 2012;97(1):16–38.
Last reviewed: June 2025
Why sliding scale insulin is used less than it once was
A sliding scale gives a dose of insulin based purely on your current blood sugar: the higher the reading, the more units you take. It's easy to follow, which is why it was a hospital mainstay for decades. The catch is that it only reacts after glucose has already climbed — it does nothing to prevent the rise in the first place. The result is often a frustrating rollercoaster of highs chased by corrections, then lows, then highs again.
That's why most guidelines now favour proactive regimens for ongoing care. Rather than waiting for a high number and reacting to it, a planned basal dose plus mealtime insulin keeps glucose steadier from the start. Sliding scales still have a place — as a short-term tool, a correction layer on top of scheduled insulin, or a starting point while a fuller regimen is worked out — but as a stand-alone, long-term strategy they tend to underperform.
How to read your sliding scale safely
A scale is simply a table: glucose ranges in one column, the matching number of correction units in the next. To use it, you measure your blood sugar, find the row your reading falls into, and take the listed dose of rapid-acting insulin. The scale this calculator builds is shaped by your own correction factor and target, so the steps reflect how sensitive you actually are to insulin.
The pitfalls worth watching for
Two mistakes cause most trouble. The first is "stacking" — correcting again before the previous dose has finished working, which can stack insulin and trigger a low. The second is treating the scale as your only insulin when you also need background (basal) coverage. Always leave enough time between corrections, and check with your team that any scale fits the rest of your regimen.
Sliding scale vs basal-bolus: which controls glucose better?
For most people who need insulin day to day, a basal-bolus regimen controls glucose more smoothly than a sliding scale alone. Basal-bolus mimics how a healthy pancreas behaves — a steady background drip plus a burst for each meal — so it heads off spikes instead of reacting to them. A sliding scale can complement that approach as the correction component, but used by itself it tends to leave more time out of range. If you're relying on a scale for everyday control, it's worth asking your provider whether a structured regimen would suit you better.
Frequently Asked Questions
What is an insulin sliding scale?
A sliding scale is a pre-calculated table that tells you how many units of rapid-acting insulin to give based on your current blood glucose. For example: BG 150–199 = 2 units, 200–249 = 4 units, 250–299 = 6 units. It functions as a quick-reference version of the correction dose formula. This generator creates a personalised table based on your ISF and target BG — not a fixed hospital protocol.
Is sliding scale insulin still recommended?
Traditional "reactive-only" sliding scales — where no basal insulin is given and insulin only reacts to high BG — are no longer recommended by ADA as a primary strategy because they allow hyperglycemia before any insulin is given and provide no coverage for meals. However, personalised correction tables based on an individual's ISF are a valid clinical tool. This calculator generates an ISF-based table to supplement (not replace) a proper basal-bolus regimen.
How is a sliding scale different from a correction dose?
They are mathematically the same. A correction dose formula requires you to compute (Current BG − Target) ÷ ISF each time. A sliding scale pre-computes these values across a range of BG values and presents them as a lookup table — faster and more convenient, especially in a hospital or for patients who prefer a reference card. This generator creates your personalised table from the same formula.