Loaded hourly cost is the right input
Salary divided by hours is not the cost of an employee — it excludes benefits, payroll taxes, software and management overhead. Using the loaded figure makes the savings estimate defensible rather than flattering.
If you are unsure, use a range and read the result as a range. The order of magnitude is usually enough to decide whether to proceed.
The share that is genuinely repetitive
Only the repetitive portion of a role is a realistic automation target. A role that is 15% repetitive has a 15% ceiling on time savings, no matter how good the tool is.
This is why most inflated ROI cases assume every task is automatable. The estimator asks for the share explicitly so the ceiling is visible.
该输入的是综合人力成本
工资除以工时，并不是一名员工的成本——它不含福利、社保税费、软件与管理开销。用综合成本计算，节省估算才站得住脚，而不是好看。
如果不确定，用区间输入，并把结果当作区间读。通常只要判断数量级，就足以决定是否推进。
真正重复的那部分
只有岗位中重复的部分，才是现实的自动化目标。一个重复度 15% 的岗位，时间节省上限就是 15%，工具再好也一样。
这也是多数虚高 ROI 案例的前提：假设每一件事都能自动化。估算器明确要求填写重复占比，让这个上限可见。