How this calculator works
The differential describes the share of all white cells that are lymphocytes. Multiplying that fraction by the total white cell count gives their absolute concentration. One x 10^9/L equals 1000 cells/µL. The inverse modes recover a missing percentage or total count; a zero percentage cannot determine a unique total. Compare results with the reporting laboratory and the clinical context. The result is an estimate for information only and is not medical advice.
Formula
Absolute count = WBC x percentage / 100. WBC = absolute count / fraction. Percentage = 100 x absolute count / WBC.
Worked example
With 7000 white cells/µL and 30% lymphocytes, the absolute count is 2100 cells/µL. With 5000 white cells/µL and 10%, it is 500 cells/µL.
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Frequently asked questions
Are cells/mm³ different from cells/µL?
No. A microlitre and a cubic millimetre have the same volume.
Can I use a count reported in x 10^9/L?
Yes. Select that unit before entering both absolute counts. A value of 7 means 7000 cells/µL.
Does this diagnose a condition?
No. A lymphocyte count is one part of a blood count and requires clinical interpretation.