Free Online Calculators
Fast, accurate and easy-to-use calculators for your money, health and work. Pick a tool and get your answer in seconds.
Mortgage Calculator
Monthly payments and total interest for any home loan.
Open tool →Loan Calculator (EMI)
Monthly payment, total interest and total cost for any loan.
Open tool →Car Loan & Depreciation Calculator
Estimate auto loan payments and vehicle depreciation.
Open tool →Credit Card Payoff Calculator
See how long it takes to pay off your card and how much interest you can save.
Open tool →Compound Interest Calculator
Project savings growth with monthly deposits and compound interest.
Open tool →Mortgage Refinance Calculator
Compare loans and find your refinance break-even point.
Open tool →Retirement Calculator
Project your retirement nest egg and check if you are on track.
Open tool →Savings Goal Calculator
See how long it takes to reach your savings goal.
Open tool →Life Insurance Calculator
Estimate how much life insurance coverage your family really needs.
Open tool →Hourly to Salary Calculator
Convert hourly pay to annual salary across work schedules.
Open tool →Overtime Pay Calculator
Calculate overtime earnings for extra working hours.
Open tool →Freelancer Tax Estimator
Estimate quarterly estimated taxes for freelancers in 7 countries.
Open tool →Tip & Bill Split Calculator
Work out tips and split the bill fairly among friends.
Open tool →Profit Calculator
Compute profit, margin and markup in seconds.
Open tool →Weight Loss Calorie Calculator
Daily calories to reach your weight goal, based on your body and activity.
Open tool →BMI Calculator
Check your BMI and healthy weight range in metric or imperial.
Open tool →BMR & TDEE Calculator
Estimate your BMR and daily calorie needs (TDEE) by activity level.
Open tool →Percentage Calculator
Solve any percentage problem: X% of Y, what percent, and % change.
Open tool →Discount Calculator
Find the sale price, savings and final cost after discounts and tax.
Open tool →Age Calculator
Calculate exact age in years, months and days from any date.
Open tool →Date Difference Calculator
Count days, weeks and business days between two dates.
Open tool →Unit Converter
Convert length, weight, temperature, area, volume and speed.
Open tool →Free online calculators for money, health and everyday life
Smart Tool Hub gathers 22 focused calculators in one place. Every tool runs entirely in your browser — nothing you type is sent anywhere, there is no sign-up, and each result appears as you type. The three groups below cover most everyday number work.
Money calculators
Work out what a loan really costs before you sign. The mortgage calculator and loan calculator show the monthly payment, the total interest and a full amortisation schedule, while the credit card payoff calculator shows how many months of minimum payments stand between you and a zero balance. For longer horizons, the compound interest calculator and retirement calculator project how regular deposits grow over decades.
Health calculators
BMI, BMR and TDEE and the weight loss calorie calculator each use standard published formulas. BMI screens weight against height; BMR estimates the calories your body burns at rest, and TDEE scales that figure by activity level to give a realistic daily target.
Work and everyday calculators
Convert pay between hourly and annual with the hourly to salary calculator, add up extra hours with the overtime pay calculator, or estimate what you owe with the freelancer tax estimator. For quick day-to-day maths there is the percentage calculator, the discount calculator, the age calculator, the date difference calculator and a unit converter.
How to use any calculator
- Pick a tool from the grid above, or use the search box to jump straight to one.
- Enter your numbers — sliders and text boxes stay in sync, and results update instantly.
- Read the summary cards for the headline figures, then scroll to the chart and the detailed table.
- Every tool page also includes the formula used, a worked example and answers to common questions.
面向金钱、健康与日常生活的免费在线计算器
智能工具中心把 22 个专注的计算器集中在一处。所有工具都在你的浏览器里运行——输入的内容不会被发送到任何地方，无需注册，结果随输入即时更新。下面三组工具覆盖了日常大部分的数值计算需求。
金钱类计算器
在签约之前，先算清一笔贷款的真实成本。房贷计算器与贷款计算器会给出月供、总利息与完整摊还明细表，而信用卡还款计算器能告诉你距离还清零余额还有多少个月。时间跨度更长时，复利计算器与退休计算器可以预测定期存款在几十年后的增长。
健康类计算器
BMI、BMR 与 TDEE以及减肥热量计算器都采用标准公开公式。BMI 用身高衡量体重；BMR 估算身体静息时消耗的热量；TDEE 再按活动强度放大，给出贴近实际的每日目标。
工作与日常类计算器
用时薪转年薪计算器在时薪与年薪之间换算，用加班费计算器统计额外工时，或用自由职业者预估税计算器估算应缴税额。日常速算则有百分比计算器、折扣计算器、年龄计算器、日期间隔计算器与单位换算器。
如何使用这些计算器
- 在上方网格中挑选工具，或用搜索框直接跳转。
- 输入数值——滑块与输入框保持同步，结果实时更新。
- 先看摘要卡片上的关键数字，再向下查看图表与明细表。
- 每个工具页还包含所用公式、算例演示与常见问题解答。