🌸 经期计算器Period Calculator
根据上次月经开始日期、周期长度和经期天数，预测接下来几次月经日期、排卵日和易孕期。Predict your next periods, ovulation day and fertile window from the first day of your last period, cycle length and period length.
使用说明与常见问题How-to & FAQ
「经期计算器」是什么？What is the Period Calculator tool?
根据上次月经开始日期、周期长度和经期天数，预测接下来几次月经日期、排卵日和易孕期。Predict your next periods, ovulation day and fertile window from the first day of your last period, cycle length and period length.
如何使用「经期计算器」？How do I use the Period Calculator tool?
在「经期计算器」中，填写「上次月经第一天」、「周期长度(天)」、「经期天数」、「预测次数」等参数，结果会随输入实时计算并显示在下方。In the Period Calculator: Fill in "First day of last period", "Cycle length (days)", "Period length (days)", "Cycles to predict"; results are recalculated instantly as you type.
预测准确吗？How accurate is it?
按固定周期推算，排卵日取下次月经前 14 天，易孕期为排卵前 5 天到排卵后 1 天。实际周期会波动，不能作为避孕或确诊依据。It assumes a fixed cycle; ovulation is taken as 14 days before the next period and the fertile window as 5 days before to 1 day after. Real cycles vary, so do not use it for contraception or diagnosis.
结果可以代替医生的建议吗？Can this replace medical advice?
不能。「经期计算器」基于常用公式给出估算，个体差异较大，如有健康问题请咨询医生或专业人士。No. The Period Calculator gives estimates from common formulas; individuals differ, so consult a doctor or professional for health decisions.
「经期计算器」免费吗？需要注册吗？Is the Period Calculator free? Do I need an account?
「经期计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Period Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.