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Slack Time Calculator — Free Online Tool
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Slack Time Calculator

Calculate total float and task slack time for project scheduling

Slack Formula: $\text{Total Float (Slack)} = \text{Late Start (LS)} - \text{Early Start (ES)}$ (or $\text{Late Finish} - \text{Early Finish}$). Enter your task schedule values below.
Project Task Parameters Input

Calculation Results

⚠️ Tasks with zero slack time ($0$ float) lie directly on the Critical Path and cannot be delayed without delaying the entire project completion date.

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