Adjusted body weight calculator

Adjusted weight equals reference weight plus your protocol's factor times the excess actual weight.

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Actual body weight (kg)

Protocol reference or ideal weight (kg)

More inputs and assumptions

Correction factor specified by protocol

Answer

…

Adjusted weight equals reference weight plus your protocol's factor times the excess actual weight.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Saved scenario

Save the current answer, then change an input to compare. This clears when you leave.

Formula and assumptions

The example factor 0.4 appears in the cited NHS formula; it is not universal. Enter a reference weight and factor chosen under the applicable clinical protocol. Actual weight must be at least reference weight for this excess-weight model. This calculator does not select a dosing weight, drug dose, eligibility threshold or weight-loss target.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-29

Using Adjusted body weight calculator

Adjusted weight equals reference weight plus your protocol's factor times the excess actual weight.

Next: Ideal body weight calculator

Next: Creatinine clearance calculator

A worked example

For actual body weight (kg) = 100, protocol reference or ideal weight (kg) = 70, correction factor specified by protocol = 0.4, adjusted reference weight (kg) = 82.

Before you use the result

Example results for actual body weight (kg)

These examples use Protocol reference or ideal weight (kg): 70; Correction factor specified by protocol: 0.4. They are reference calculations, not recommended settings.

Actual body weight (kg)	Adjusted reference weight (kg)
100	82
200	122

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ToolOctopus. “Adjusted body weight calculator.” Updated 2026-09-29. https://tooloctopus.com/adjusted-body-weight-calculator.

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