Health & Fitness Calculators
Free tools for weight, calories, body composition and pregnancy — enter your numbers, get your targets
Numbers that describe your body
Health advice is full of ranges — healthy BMI, target weight, calorie ceilings — but none of them mean anything until they are matched to your height, age, sex and activity. The calculators here take those inputs once and return the figures that advice is built on, each with its formula and its limits stated plainly.
Weight and composition
- BMI — the quick screening number, with healthy-weight ranges in metric or imperial units.
- Ideal Weight — four classic formulas side by side, so you can see the range rather than one dogmatic figure.
- Body Fat — the US Navy circumference method, splitting your weight into fat and lean mass.
Energy and food
BMR & TDEE estimates what you burn at rest and with activity; the Calorie Calculator turns a goal — lose, maintain, gain — into a daily target; the Macro Calculator splits that target into protein, carbohydrates and fat; and the Weight Loss Calorie Calculator paces a specific loss over time so the deficit stays realistic.
Pregnancy
The Due Date Calculator estimates the due date from your last period or conception date, with gestational age, trimester and a 40-week progress view.
These tools are estimates for planning, not diagnoses — the guides under each calculator say where their formulas come from and where they stop. For anything medical, your doctor's measurements win.
描述你身体的那些数字
健康建议里全是区间——健康 BMI、目标体重、热量上限——但不和你的身高、年龄、性别与活动量对上，这些区间就没有任何意义。这里的计算器只需输入一次你的数据，就给出建议背后的数字，每个工具都写明公式来源与适用边界。
体重与体成分
- BMI——最快捷的筛查指标，同时给出公制/英制的健康体重范围。
- 理想体重——四种经典公式并列对照，看到的是一个区间，而不是一个武断的数字。
- 体脂率——美国海军围度法，把体重拆成脂肪量与瘦体重。
能量与饮食
BMR 与 TDEE 估算你在静息和活动状态下的消耗；每日热量计算器把「减、稳、增」的目标换算成每日摄入；宏量营养素计算器再把目标拆成蛋白质、碳水与脂肪；减肥热量计算器则按目标减重节奏安排热量缺口，避免一刀切。
孕期
预产期计算器从末次月经或受孕日推算预产期，附孕周、孕期阶段与 40 周进度视图。
这些工具给出的是用于规划的估算值，不是诊断——每个计算器下方的指南都写明公式出处与适用边界。涉及医疗问题时，以医生的测量为准。
Frequently Asked Questions
Which weight calculator should I use?
Use BMI for a quick screen against population ranges, Ideal Weight to see several formulas' targets side by side, and Body Fat to separate fat mass from lean mass. They answer different questions — BMI asks about your weight for your height, body fat asks what that weight is made of.
How many calories should I eat per day?
It depends on your size, age, sex and activity — typically 1,600–2,400 for women and 2,000–3,000 for men. The Calorie Calculator and BMR & TDEE Calculator estimate your personal figure and adjust it for a gain, maintenance or loss goal.
Are these health calculators medical advice?
No. They apply published formulas to the numbers you enter and are intended for planning and learning. They cannot see you, and they do not replace a clinician's assessment — use them to prepare informed questions for your doctor.
Last reviewed: October 5, 2026 · How we calculate · Sources: WHO, NIH, CDC, ACOG, US Navy
最近复核：2026 年 10 月 5 日 · 我们的计算方法 · 来源：世界卫生组织、NIH、CDC、ACOG、美国海军