Insulin Dose Calculator by Weight
Medically reviewed by Dr. Chhaya Makhija, MD, DipABLM — October 2026
Multiply your weight in kilograms by a dose factor to estimate a starting total daily dose (TDD). The ADA lists 0.5 units/kg/day as the typical start for a metabolically stable adult with type 1 diabetes, and the calculator splits that total into basal and mealtime insulin.
⚖️ Dose by Weight Calculator
Estimated Results
Estimated Total Daily Dose (TDD)
(0.4 u/kg)
(0.6 u/kg)
(~50% TDD)
(~50% TDD)
How to Use the Insulin Dose Calculator by Weight
Enter Weight
Type your weight and choose kg or lbs — values convert automatically when you toggle.
Choose Dose Factor
Pick 0.5 u/kg for a stable adult with type 1 diabetes. Pick 0.2 u/kg for a type 2 basal-only start, or 0.3 u/kg for a cautious hospital start.
See the Range
Results show your estimate next to the 0.4 and 0.6 u/kg totals, so you see how much the factor changes the answer.
Note Basal/Bolus Split
Roughly half of TDD is basal (long-acting), half is bolus pool (split across meals and correction).
Review the Formula
The exact calculation is shown — take a screenshot or copy it to share with your provider.
Confirm With Your Team
Bring this estimate to your next appointment. Your provider will confirm, adjust, and guide titration.
How the Dose by Weight Formula Works
Weight-based insulin dosing estimates a starting total daily dose (TDD) for someone who begins insulin therapy. Insulin needs rise with body mass, so the formula multiplies weight by a fixed number of units per kilogram. The result is a first estimate that blood glucose readings then correct over the following weeks.
The Weight-Based TDD Formula
The ADA Standards of Care 2026 give typical total doses of 0.4–1 unit/kg/day and name 0.5 u/kg/day as the typical starting dose for a metabolically stable adult with type 1 diabetes. This calculator defaults to 0.5. Worked example: 80 kg × 0.5 = 40 units/day → basal ≈ 20 u, bolus pool ≈ 20 u.
The ADA splits that TDD roughly in half, and the UCSF Diabetes Teaching Center gives basal 40–50% of the total. In practice: about 50% basal (long-acting insulin given once or twice daily) and 50% bolus pool (rapid-acting insulin given at meals, divided across 3 meals as ~17% TDD each). Mealtime doses are further refined using the insulin-to-carb ratio, and correction doses use the insulin sensitivity factor — both derivable from TDD using the 500 Rule and 1800 Rule respectively.
Why Most Calculators Use 0.4–0.6 u/kg
The 0.4–0.6 window sits at the lower, safer end of the ADA's 0.4–1 u/kg range. It covers most adults who start full insulin replacement outside puberty, pregnancy or illness. A person who is more insulin-sensitive (lean, active, no metabolic syndrome) will often do well at the lower end; someone with higher insulin resistance (obesity, sedentary, Type 2 with significant beta-cell dysfunction) may need the upper end or beyond. The range is a starting window — not a ceiling or a floor. Actual TDD emerges from titration over weeks.
For insulin-naïve Type 2 patients, the ADA starts basal insulin at 0.1–0.2 u/kg/day, and the common fixed alternative is 10 units once daily. Both keep hypoglycemia risk low during the first weeks. This is available via the dose factor dropdown above.
Starting dose by patient type
The 0.4–0.6 u/kg window fits one specific patient: a metabolically stable adult with type 1 diabetes. It gives the wrong answer for several others. Published starting ranges span roughly 0.1 to 2.0 u/kg/day depending on who is being dosed — a twentyfold spread that a single number cannot represent.
| Patient group | Total daily dose | Why it differs |
|---|---|---|
| Newly diagnosed Type 1 adult | 0.2 – 0.6 u/kg/day | Lower end where endogenous insulin production persists — the "honeymoon" phase |
| Stable Type 1 adult | ≈ 0.5 u/kg/day typical | The ADA's stated typical starting dose; roughly half given as basal |
| Children, new-onset Type 1 | 0.5 – 1.0 u/kg/day | Young, lean, prepubertal children sit at the low end; puberty, DKA at diagnosis or obesity push it up |
| Type 1 during puberty | Up to 1.0 u/kg/day or more | Growth hormone and sex steroids sharply raise insulin resistance |
| Insulin-naïve Type 2, basal start | 0.1 – 0.2 u/kg/day or fixed 10 units | Conservative start; titrated upward against fasting glucose |
| Type 2 with insulin resistance | 0.5 – 2.0 u/kg/day | Resistance varies enormously; the upper end is legitimate, not an error |
| Hospital, not critically ill, eating | 0.3 – 0.6 u/kg/day | ADA hospital start; half basal, half nutritional, or 80% of the home dose if already on insulin |
| Anyone on glucocorticoids | ≈ 50% above their own baseline | Steroids drive requirements to 0.5 and often well past 1.0 u/kg/day |
Two practical consequences. First, if you are an insulin-naïve Type 2 patient, a calculator that hands you 0.5 u/kg is giving you something like three to five times the recommended starting dose — always start where your clinician starts you, not where a default lands. Second, if you are a Type 2 patient already needing 1.5 u/kg, that is not evidence you are doing something wrong; it is inside the published range.
When the weight-based estimate stops working
Weight-based dosing assumes your body handles insulin the way an average body does. Three common situations break that assumption, and each moves the dose in a predictable direction.
Reduced kidney function — requirements fall
This is the one most weight-based calculators ignore, and it is the one most likely to cause harm. The kidneys clear roughly 30–80% of circulating insulin. Injected insulin is cleared renally, unlike your own insulin, which is largely broken down by the liver on first pass. So as kidney function declines, insulin hangs around longer and requirements drop — while a weight-based formula, which knows nothing about your eGFR, keeps returning the same number.
| Kidney function | Typical dose adjustment |
|---|---|
| eGFR < 60 mL/min/1.73m² | Reduce total daily dose by roughly 10–25% |
| eGFR < 30 mL/min/1.73m² | Reduce total daily dose by roughly 25–50% |
One study of Type 1 patients recorded a 38% fall in insulin requirement as kidney function declined from 80 to 10 mL/min. The variability is wide, though — in some people the dose barely changes, and rarely it rises. These are prompts for closer monitoring and a clinician conversation, not adjustments to make on your own.
Steroids — requirements rise, then fall again
Glucocorticoids such as prednisone and dexamethasone raise insulin requirements by around 50% above a person's own baseline, commonly pushing total daily dose past 1.0 u/kg. The rise is not evenly spread across the day: steroid-driven hyperglycemia is typically worst in the afternoon and evening after a morning dose. The part people miss is the other side — when the steroid is tapered or stopped, requirements fall back, and an unchanged insulin dose becomes a hypoglycemia risk. Our insulin and steroids guide, linked below, walks through the taper.
The honeymoon phase — requirements are temporarily low
In the months after a Type 1 diagnosis, surviving beta cells often recover enough function to cover part of the load. Insulin requirements can fall to the very bottom of the range, sometimes below 0.2 u/kg/day, and it can look like the diabetes is resolving. It is not. The phase ends, requirements climb back toward normal, and doses need to rise with them — which is why a starting dose calculated during the honeymoon should never be treated as a permanent target.
Why Use This Tool
Shows the Full Range
Displays the 0.4 and 0.6 u/kg totals next to your selected factor, not just one number.
Formula Transparency
Your exact calculation — weight, factor, TDD — is shown so you can verify or share it.
kg / lbs Toggle
Enter weight in either unit — the calculator converts without losing your entry.
Private — No Data Sent
All calculation runs in your browser. Nothing is transmitted or stored.
Limitations & Safety Notes
- Weight alone does not determine insulin need — activity, diet, and physiology all matter significantly.
- Children use their own range (about 0.5–1.0 u/kg/day at diagnosis) and start insulin under a pediatric diabetes team.
- Renal impairment reduces insulin clearance; standard formulas may overestimate requirements.
- This estimate does not account for current blood glucose, carbohydrate intake, or time of day.
Worked Examples: Three Different Patients
Case 1 — Newly diagnosed Type 1 adult, 68 kg
TDD = 68 × 0.5 = 34 u/dayBasal ≈ 17 u long-acting · Bolus pool ≈ 17 u across meals
Full replacement from day one; doses adjusted rapidly in the first weeks, often downward during the honeymoon phase.
Case 2 — Insulin-naïve Type 2 adult, 95 kg
Weight-based: 95 × 0.2 = 19 u/day vs fixed protocol: 10 u basal
Guidelines start with the lower option — 10 units of basal at bedtime — then titrate +2 u every 3 days to fasting target. See the Starting Dose Calculator.
Case 3 — Type 2 with significant insulin resistance, 110 kg
Initial estimate: 110 × 0.6 = 66 u/day
People with marked resistance often exceed the 0.6 ceiling over time — some require >1 u/kg/day. The formula sets the starting window, not the destination.
Case 4 — Hospital admission, 90 kg, eating meals
TDD = 90 × 0.4 = 36 u/dayBasal 18 u · Nutritional 6 u before each of 3 meals
The ADA hospital range is 0.3–0.6 u/kg/day. Teams pick the low end for older, lean or kidney-impaired patients. A patient already on insulin at home usually starts at 80% of the home total instead.
Insulin dose by weight in pounds
UCSF teaches the same math in pounds: TDD ≈ weight in lb ÷ 4, which equals about 0.55 u/kg. A 160 lb adult gets 160 ÷ 4 = 40 units a day, the same as 72.5 kg × 0.55. The table answers the common "how much insulin for a 200 lb person" question for full replacement.
| Weight (lb) | Weight (kg) | TDD (lb ÷ 4) | Basal ≈ 50% | Each of 3 meals |
|---|---|---|---|---|
| 120 lb | 54.4 kg | 30 u | 15 u | ≈ 5.0 u |
| 140 lb | 63.5 kg | 35 u | 17.5 u | ≈ 5.8 u |
| 160 lb | 72.6 kg | 40 u | 20 u | ≈ 6.7 u |
| 180 lb | 81.6 kg | 45 u | 22.5 u | ≈ 7.5 u |
| 200 lb | 90.7 kg | 50 u | 25 u | ≈ 8.3 u |
| 220 lb | 99.8 kg | 55 u | 27.5 u | ≈ 9.2 u |
| 250 lb | 113.4 kg | 62.5 u | 31.25 u | ≈ 10.4 u |
| 300 lb | 136.1 kg | 75 u | 37.5 u | ≈ 12.5 u |
These totals assume full insulin replacement. A type 2 patient starting basal insulin alone begins far lower, at 0.1–0.2 u/kg/day or 10 units.
Insulin Dose by Weight Chart (kg and lb)
Estimated starting TDD at four common dose factors, from a type 2 basal start to the upper full-replacement start. Print it or screenshot it for your next appointment.
| Weight | 0.2 u/kg (naïve T2) | 0.4 u/kg (low) | 0.5 u/kg (mid) | 0.6 u/kg (high) |
|---|---|---|---|---|
| 50 kg / 110 lb | 10 u | 20 u | 25 u | 30 u |
| 60 kg / 132 lb | 12 u | 24 u | 30 u | 36 u |
| 70 kg / 154 lb | 14 u | 28 u | 35 u | 42 u |
| 80 kg / 176 lb | 16 u | 32 u | 40 u | 48 u |
| 90 kg / 198 lb | 18 u | 36 u | 45 u | 54 u |
| 100 kg / 220 lb | 20 u | 40 u | 50 u | 60 u |
| 110 kg / 243 lb | 22 u | 44 u | 55 u | 66 u |
| 120 kg / 265 lb | 24 u | 48 u | 60 u | 72 u |
| 130 kg / 287 lb | 26 u | 52 u | 65 u | 78 u |
| 140 kg / 309 lb | 28 u | 56 u | 70 u | 84 u |
| 150 kg / 331 lb | 30 u | 60 u | 75 u | 90 u |
From Starting Dose to Working Dose: Titration
The weight-based number is where therapy begins, not where it ends. A common outpatient basal titration pattern (ADA-referenced): check fasting glucose daily and increase basal by 2 units every 3 days until fasting readings sit consistently in the 80–130 mg/dL (4.4–7.2 mmol/L) target — reducing by 10–20% if hypoglycemia occurs. Mealtime doses are then refined via post-meal readings using the carb ratio and sensitivity factor. Expect 2–6 weeks of adjustment; landing away from the formula estimate is normal and expected.
Three tools carry that estimate forward. The total daily dose calculator confirms the TDD this figure produces, the insulin-to-carb ratio calculator sets your mealtime coverage using the 500 rule, and the sensitivity factor calculator sets the correction step using the 1800 rule.
Weight-based dosing is the first step in most insulin regimens, and the insulin calculator homepage groups every tool that builds on it.
Sources & References
- American Diabetes Association. 9. Pharmacologic Approaches to Glycemic Treatment: Standards of Care in Diabetes — 2026. Diabetes Care. 2026;49(Suppl 1):S183. Link — source of the 0.4–1 u/kg/day typical range, the 0.5 u/kg/day stable type 1 start, the 0.2–0.6 new-onset range, the 0.1–0.2 type 2 basal start and the ~50% basal share.
- American Diabetes Association. 16. Diabetes Care in the Hospital: Standards of Care in Diabetes — 2026. Diabetes Care. 2026;49(Suppl 1):S339. Link — source of the 0.3–0.6 u/kg/day hospital start, the 80% home-dose rule and the half basal / half nutritional split.
- Endotext / NCBI Bookshelf. Inpatient Diabetes Management. Link — source of the 0.5–2.0 u/kg/day Type 2 range, the 0.1–0.2 u/kg basal start, and the ~50% glucocorticoid increase.
- Management of diabetes mellitus in patients with chronic kidney disease. PMC. Link — renal insulin clearance and dose-reduction guidance.
- Insulin requirements in patients with diabetes and declining kidney function. PMC. Link — the 38% requirement reduction as eGFR fell from 80 to 10 mL/min.
- UCSF Diabetes Teaching Center. Calculating Insulin Dose. Link — source of the weight in lb ÷ 4 (0.55 u/kg) shortcut and the 40–50% basal share.
- University of Iowa Stead Family Children's Hospital. Calculating Total Daily Dose — Inpatient Management of Pediatric Diabetes. Link — source of the 0.5–1 u/kg/day pediatric starting range.
- NIDDK. Insulin Medicines & Treatments. Link
Written by Ryan Mitchell · Last updated: October 2026
Frequently Asked Questions: Insulin Dose Calculator by Weight
How do you calculate insulin dose by weight?
Multiply body weight in kilograms by a dose factor in units/kg/day. The ADA names 0.5 u/kg/day as the typical start for a stable adult with type 1 diabetes. A 70 kg adult gets 70 × 0.5 = 35 units/day, split into about 17.5 u basal and 17.5 u for meals. In pounds, divide weight by 4. Confirm any estimate with your healthcare provider before you act on it.
What is 0.5 units per kg of insulin?
It means 0.5 units of insulin per kilogram of body weight per day. The ADA Standards of Care 2026 list it as the typical starting total for a metabolically stable adult with type 1 diabetes, inside a wider 0.4–1 u/kg/day range. A 75 kg person gets 37.5 units/day at this factor. Blood glucose readings then adjust the dose over the next few weeks.
Is insulin dose the same for all body weights?
No. Weight scales the estimate — a heavier person generally requires more insulin as a starting point — but weight is just one input. Two people of identical weight may need very different actual doses depending on diet, physical activity, insulin sensitivity, other medications, kidney function, and many other factors. Weight-based formulas are starting points, not precise prescriptions.
What is the low vs high dose range?
The ADA gives typical total doses of 0.4 to 1 unit/kg/day, with higher needs in puberty, illness and the premenstrual phase. Newly diagnosed type 1 adults often need only 0.2–0.6 u/kg/day. Type 2 patients starting basal insulin begin at 0.1–0.2 u/kg/day or 10 units. People with strong insulin resistance can need well above 1 u/kg/day after titration.
Should I round my insulin dose to the nearest unit?
Most syringes and pens deliver insulin in 1-unit or 0.5-unit increments, so rounding is practically necessary. This calculator rounds to the nearest 0.5 unit. Insulin pumps can deliver much smaller increments (0.025–0.1 u). Your provider will give guidance on rounding appropriate for your specific device and regimen.
How many units of insulin per kg is normal?
There is no single normal figure — published starting ranges run from about 0.1 to 2.0 units per kg per day depending on who is being dosed. A stable adult with Type 1 diabetes typically starts near 0.5 u/kg/day. An insulin-naïve Type 2 patient usually starts far lower, at 0.1–0.2 u/kg/day or a fixed 10 units of basal. A Type 2 patient with marked insulin resistance may legitimately need 1.0–2.0 u/kg/day. Comparing your dose to someone in a different group tells you very little.
Do I need less insulin if I have kidney disease?
Usually yes, and this is a common cause of unexplained hypoglycemia. Your kidneys clear roughly 30–80% of circulating insulin, so as kidney function falls insulin stays active longer and requirements drop. Common guidance is to reduce the total daily dose by around 10–25% below an eGFR of 60, and by around 25–50% below an eGFR of 30. One study recorded a 38% reduction as kidney function fell from 80 to 10 mL/min. Variability is wide, so this is a reason for closer monitoring with your clinician, not a change to make yourself.
Why did my insulin dose go up on steroids?
Glucocorticoids such as prednisone and dexamethasone raise insulin requirements by roughly 50% above your own baseline, often pushing the total past 1.0 u/kg/day. The effect is uneven across the day — with a morning steroid dose, glucose usually runs highest in the afternoon and evening. Equally important is the way down: when the steroid is tapered, requirements fall back, and leaving the insulin dose unchanged becomes a hypoglycemia risk.
Why is my insulin need so low after diagnosis?
This is usually the honeymoon phase. In the months after a Type 1 diagnosis, surviving beta cells often recover enough function to cover part of the workload, and requirements can drop below 0.2 u/kg/day. It can feel like the diabetes is receding, but it is temporary — the phase ends and requirements climb back. A dose worked out during the honeymoon should be treated as a snapshot, not a permanent target.
How much insulin should a 200 lb person take?
For full insulin replacement, the pounds shortcut gives 200 ÷ 4 = 50 units a day, about 25 units basal and 8 units before each meal. That matches 90.7 kg × 0.55 u/kg. A 200 lb adult with type 2 diabetes who starts basal insulin alone begins far lower: 9–18 units (0.1–0.2 u/kg) or a flat 10 units. The prescriber sets the actual starting dose.
What weight-based insulin dose is used in the hospital?
The ADA Standards of Care 2026 give 0.3–0.6 u/kg/day as the usual starting total for a hospitalized adult who is not critically ill and is eating. Half goes to basal insulin and half to mealtime (nutritional) insulin. A patient already on insulin at home usually starts at 80% of the home total. Older, lean or kidney-impaired patients start at the lower end.