# Transfection Efficiency Calculator (GFP Positive Rate) GFP reporter transfection scoring: efficiency = GFP+ / total × 100 with a Wilson 95% CI in single mode and per-replicate mean ± SD in replicate mode. Interpretation bands from excellent (≥70%) to low (<10%) with optimization hints. Wilson 1927 / Newcombe 1998 / Kim & Eberwine 2010 derived. Educational use only. > Canonical page: https://elysiatools.com/en/tools/transfection-efficiency - **Category:** Education - **Keywords:** transfection efficiency calculator, gfp positive rate, transfection gfp percentage, flow cytometry transfection, fluorescence microscopy cell counting, wilson confidence interval proportion, replicate mean sd transfection, cell transfection optimization, mammalian cell expression, molecular biology, lab calculator ## Overview The Transfection Efficiency Calculator estimates GFP-based transfection efficiency from GFP-positive and total cell counts. Use single mode for one pooled measurement with a Wilson 95% confidence interval, or replicate mode for per-replicate percentages, mean, and sample standard deviation. Educational use only. ## Inputs - **Calculation Mode** (select): One pooled count, or several replicate wells/fields for mean ± SD. - **Total Cells Counted** (number): Total viable cells scored (single mode). - **GFP-Positive Cells** (number): Cells scoring above the GFP threshold (single mode). - **Replicate Totals (comma-separated)** (text): Total cells per replicate well/field (replicate mode; same count as the GFP list). - **Replicate GFP Positives (comma-separated)** (text): GFP-positive cells per replicate in the same order (replicate mode). - **Decimal Places** (number) ## When to use - Calculate the GFP-positive percentage from a single flow cytometry or microscopy count. - Summarize transfection efficiency across replicate wells or fluorescence microscopy fields. - Review efficiency results with a confidence interval or replicate variability before comparing experiments. ## How it works - Select Single measurement or Replicate wells or fields. - In single mode, enter total cells counted and GFP-positive cells. - In replicate mode, enter comma-separated total and GFP-positive counts in matching order. - Choose the decimal places and review the calculated efficiency and statistics. ## Use cases - Evaluate GFP reporter expression after a transfection experiment. - Summarize cell counts from replicate wells or randomly selected microscopy fields. - Compare observed GFP-positive rates with broad transfection-efficiency interpretation bands. ## Frequently asked questions ### How is transfection efficiency calculated? Efficiency is GFP-positive cells divided by total cells, multiplied by 100. ### What does single measurement mode provide? It provides the GFP-positive percentage and a Wilson 95% confidence interval. ### What does replicate mode provide? It calculates efficiency for each replicate, then reports the mean and sample standard deviation. ### How should replicate values be entered? Enter comma-separated totals and GFP-positive counts in the same order, with the same number of values. ### Is this calculator suitable for clinical decisions? 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