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Hemoglobin unit converter

Convert an existing hemoglobin result between grams per decilitre and grams per litre without applying a reference range or interpreting the result.

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Hemoglobin unit converter showing the same concentration as 15.0 g/dL and 150 g/L with exact factor-of-ten arithmetic

Calculate your result

Enter the numeric result only. Keep the original report and its unit, specimen, method and reference interval.

Accepted range: 0 to 100 g/dL

Your result will appear here

Nothing is saved or added to the URL.

What this result means

One gram per decilitre equals 10 grams per litre. Choose the direction and enter the hemoglobin number from your report; the converter multiplies or divides by exactly 10. [1][2]

How to convert hemoglobin units

To convert g/dL to g/L, multiply by 10. To convert g/L to g/dL, divide by 10. The relationship comes from the exact SI prefix definition: one decilitre is one-tenth of a litre. [1][2]

For example, 15 g/dL is 150 g/L, while 150 g/L is 15 g/dL.

The concentration does not change

A unit conversion changes only how the same mass concentration is written. It does not change the blood sample, laboratory measurement or clinical meaning. [1][2]

Keep the original result and unit. A rounded converted value should not be treated as more precise than the laboratory's reported number.

Keep the report's own reference interval

This converter deliberately does not provide a normal range. If you compare a result with a reference interval, convert both into the same unit and use the interval from the same report and laboratory context.

For an explanation of hemoglobin, report ranges and related CBC measurements, use the separate LongevityMate hemoglobin guide. That guide and its interactive range tool own interpretation; this page owns unit conversion only.

This is not an HbA1c converter

Hemoglobin concentration in g/dL or g/L is different from HbA1c, which is commonly reported as a percentage or mmol/mol. Do not enter an HbA1c result here.

The tool also does not estimate hematocrit, MCH, MCHC, oxygen carrying capacity or oxygen saturation.

Privacy and limitations

The conversion runs locally in your browser. The entered value and result are not placed in the page URL or sent as analytics details.

The calculator cannot check whether a laboratory value was entered correctly, whether the specimen or assay was suitable, or what action a result may require.

Formula and assumptions

Formula
g/L = g/dL × 10. g/dL = g/L ÷ 10. [1][2]
Version
Hemoglobin g/dL and g/L conversion, hemoglobin-gdl-gl-conversion-v1
Rounding
Use exact decimal arithmetic with 10 stored as 10/1 and its reciprocal as 1/10, then round the displayed result once to two decimal places. Exact halfway ties round upward in magnitude; a positive value below display resolution uses a less-than result.
Worked example
Example: a report shows hemoglobin of 12.34 g/dL. Multiply by 10: 12.34 × 10 = 123.4, so the converted result is 123.40 g/L. [1][2]

Who this is for — and when not to use it

Intended use

Neutral unit conversion for a person who already has a hemoglobin or haemoglobin mass concentration reported in g/dL or g/L.

Not intended for

This tool does not interpret hemoglobin, apply a reference range or cutoff, diagnose anemia or polycythemia, estimate hematocrit, convert HbA1c, assess oxygen saturation or guide testing, treatment, supplements, pregnancy or paediatric care.

Exclusions

  • Hemoglobin reference ranges, low or high classification, clinical cutoffs and diagnosis
  • HbA1c, glycated hemoglobin, mmol/mol and estimated average glucose
  • Hematocrit, MCH, MCHC, red-cell count, oxygen saturation and other measurements
  • Pregnancy, childhood, altitude, transfusion, bleeding, symptoms and urgent-care decisions
  • Treatment, iron or other supplement advice and follow-up testing decisions
  • Assay quality, specimen suitability and changing precision absent from the source report

Evidence sources

  1. 1. SI prefixes — International Bureau of Weights and Measures. Accessed Aug 30, 2026.
  2. 2. SI units and prefixes — National Institute of Standards and Technology. Accessed Aug 30, 2026.