Калькулятор возраста
Рассчитайте точный возраст по дате рождения
Калькулятор разницы между датами
Найдите разницу между двумя датами
Калькулятор продолжительности времени
Легко добавляйте или вычитайте продолжительности времени
Калькулятор процентов
Мгновенно рассчитывайте проценты, изменения и соотношения
Калькулятор скидок
Рассчитать цену после скидки
Калькулятор ИМТ
Рассчитать индекс массы тела
Калькулятор беременности
Рассчитать предполагаемую дату родов
Калькулятор калорий
Рассчитать суточную норму калорий
Калькулятор скорости
Рассчитать скорость, расстояние или время
Калькулятор стоимости электричества
Рассчитайте затраты на электроэнергию и потребление энергии для ваших устройств и приборов.
Калькулятор процентов
Рассчитать простые и сложные проценты
Кредитный калькулятор
Рассчитать ежемесячные платежи и проценты
Ипотечный калькулятор
Оценить ежемесячные ипотечные платежи
Калькулятор НДС
Добавить или убрать НДС
Калькулятор передачи данных
Рассчитайте время передачи файла и необходимую скорость
Конвертер единиц
Конвертируйте между длиной, весом, температурой и многим другим
Free Online Calculators for Everyday Decisions
This calculator collection covers the math most people actually need to do: age, BMI, calorie and nutrition, loan and mortgage, interest, VAT and discount, percentage, timestamp, unit and color conversions, dates, and many more. Each calculator is focused on one decision, runs instantly in your browser, and explains the inputs so you understand what you are calculating.
Unlike spreadsheets or phone app calculators, these tools are purpose-built for specific questions. Pick the one that matches the decision you are making and skip the setup. No formulas to remember, no signup, no ads in the middle of the results.
Why These Calculators
Purpose-Built for Each Question
Each calculator is tailored to one common question — loan payment, BMI, discount, percentage — so you see only the inputs that matter.
Clear Explanations
Every result shows how it was calculated. No black box. You can verify the math yourself or adjust assumptions.
No Signup or App
Open the calculator, punch in numbers, get an answer. No account, no install, no paywall.
Works Offline After Load
Calculations run in your browser. Once the page is loaded, you can keep working without an internet connection.
Common Calculator Tasks
People use this collection most often for:
- Working out a monthly payment on a car loan, mortgage, or personal loan before signing.
- Checking BMI, calorie targets, or nutrition numbers when starting a health or fitness plan.
- Calculating VAT, discount, or tip quickly at a register, restaurant, or checkout.
- Converting a Unix timestamp to a human date, or vice versa, for debugging or log analysis.
- Counting the days, months, or years between two dates for deadlines, age calculations, or project planning.
How to Use the Calculators
Every calculator follows the same flow:
- Pick a calculator. Choose the one that matches your question from the cards above.
- Fill in the inputs. Type or adjust each value. Most calculators update the result as you type, so you can experiment with scenarios.
- Read the breakdown. See the final answer plus the intermediate calculations. Copy or screenshot the result as needed.
Calculators FAQ
Are these calculations accurate?
Yes — each calculator uses the standard formula for its domain (loan amortization, BMI, percentage, etc.). For critical financial or medical decisions, always double-check with a professional.
Do I need to install anything?
No. Every calculator runs directly in your browser. There is no download, no sign-in, and no app to install.
Are my inputs saved anywhere?
No. All calculations happen locally. We do not store your inputs, results, or usage on our server.
Do the tools work on mobile?
Yes. Every calculator is responsive and works well on phones, tablets, and desktops.
Can I use the results in a document?
Yes. Copy the result or take a screenshot. For regulated decisions (lending, medical) we recommend noting the tool and inputs used for reference.