Insulin & carbohydrate calculator

Carb counting and bolus arithmetic for a client already on insulin, using the ratios their prescriber has set.

This applies a prescription. It does not write one.

Enter the insulin-to-carb ratio and correction factor exactly as the prescribing physician set them. This tool will not derive a ratio for a client, and nothing here starts, stops or titrates insulin. If a calculated dose looks wrong, it goes to the prescriber — not into the pen.

1 · Prescribed ratios

Insulin-to-carb ratio

1 unit covers this many grams

Correction factor (mg/dL/unit)

Optional — needed for a correction

Target glucose (mg/dL)

Max single dose (units)

Optional prescribed ceiling

Delivery increment

Pen or pump step size

2 · This meal

Carbohydrate (g)

or exchanges

1 exchange = 15 g

Current glucose (mg/dL)

Optional

Insulin on board (units)

Still active from an earlier dose

Indian household reference: 1 chapati ≈ 15 g · ½ katori cooked rice ≈ 15 g · 1 katori dal ≈ 15 g · 1 medium fruit ≈ 15 g. Confirm against the food table for the actual preparation — these are teaching approximations, not analytical values.

Enter the prescribed insulin-to-carb ratio and the carbohydrate in the meal to calculate.