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Free online calculators for finance, energy, health and everyday life

Calc World offers free online calculators for important everyday topics. Estimate loans, interest, savings plans, electricity costs, heating costs, BMI, calorie needs, VAT and date differences quickly and easily – directly in your browser, without registration.

Our tools are designed to provide not only results, but also enough context to help you understand how those results are formed. That makes comparisons, planning and everyday decisions much easier.

Jump directly to key sections

Choose a category and go directly to the calculator you need. Every page is free to use and includes additional explanations to help you interpret the results more confidently.

Finance calculators Energy calculators

Popular calculators

These calculators are especially relevant for users and cover practical topics from finance and energy to health.

Electricity Cost CalculatorCalculate electricity consumption and electricity cost per day, month and year quickly online.Heating Cost CalculatorCalculate annual heating costs, monthly average costs, and cost per square meter.Photovoltaic CalculatorCalculate annual yield, self-consumption, feed-in, annual benefit and rough payback period of your solar PV system.Heat Pump CalculatorCalculate electricity consumption, annual heating cost, monthly cost and effective heat cost of your heat pump.Gas Consumption CalculatorCalculate gas consumption in kWh, annual heating cost, monthly cost and an estimated CO₂ footprint.Loan CalculatorCalculate monthly payment, term, total repayment and interest cost for your loan online.Compound Interest CalculatorCalculate future value, total contributions and compound growth based on initial capital, monthly savings, years and annual return.ETF Savings Plan CalculatorCalculate final value, total contributions, return and long-term wealth growth with an ETF savings plan.

All calculators by category

Choose a category and go directly to the calculator you need. Every page is free to use and includes additional explanations to help you interpret the results more confidently.

Energy

Energy calculators for electricity, heating and home efficiency

Calculate electricity costs, heating costs, gas consumption, heat pump costs and the potential benefits of a photovoltaic system. These tools help you understand household energy expenses and identify savings opportunities more clearly.

Finance

Finance calculators for loans, savings and long-term planning

Use our finance calculators to estimate loan payments, compound interest, ETF savings plans, inflation, savings goals and net salary. This helps you compare offers, understand monthly costs and make better financial decisions.

Loan CalculatorCalculate monthly payment, term, total repayment and interest cost for your loan online.Compound Interest CalculatorCalculate future value, total contributions and compound growth based on initial capital, monthly savings, years and annual return.ETF Savings Plan CalculatorCalculate final value, total contributions, return and long-term wealth growth with an ETF savings plan.Savings CalculatorCalculate final savings value, total contributions, interest growth and the monthly contribution needed for your savings goal.Inflation CalculatorCalculate purchasing power loss, future value and present-day equivalent based on an assumed annual inflation rate.Net to Gross Salary CalculatorEstimate net salary from gross salary or roughly convert a net amount back to the gross salary required.

Taxes

VAT CalculatorCalculate net amount, gross amount and included VAT quickly and easily online.

Everyday

Everyday calculators for percentages, dates, age and VAT

Our everyday calculators help with common calculations such as percentages, VAT, date differences and age. Fast, free and available directly in your browser.

Percentage CalculatorCalculate percentage value, percentage rate, base value as well as percentage increase and decrease.Age CalculatorCalculate your exact age in years, months and days.Date CalculatorCalculate the difference between two dates or shift a date by a number of days.

Health

Health calculators for body metrics and calorie needs

Use our health calculators to estimate BMI, basal metabolic rate and calorie needs online. These tools provide a practical first estimate for nutrition, weight and activity-related planning.

BMI Calculator: calculate your body mass indexCalculate your BMI and assess your body weight online.Calorie Calculator: daily calorie needsCalculate your daily calorie needs based on age, weight, height and activity.BMR Calculator: basal metabolic rateCalculate your basal metabolic rate and estimate calories burned at rest.

Why online calculators are useful

Many everyday decisions depend on numbers: What does a loan really cost? How much should you save every month? Is a photovoltaic system worth it? How many calories do you need? Online calculators provide a fast and practical first estimate within seconds.

This is especially useful for finance, energy and health topics, where comparing multiple scenarios can lead to better decisions. By changing assumptions and inputs, you can understand which factors have the biggest impact on the outcome.

All calculators on this website are free, immediately available and do not require registration. For binding decisions, professional advice may still be necessary depending on the topic.

Frequently asked questions

Are the calculators free to use?

Yes, all calculators on this website are free and can be used directly in your browser.

Do I need an account?

No, registration is not required to use the calculators.

Are the results legally or professionally binding?

No. The results are for general guidance and depend on your inputs. Depending on the topic, individual circumstances and legal frameworks may vary.

Is the website available in German and English?

Yes, the site provides both German and English versions.

Important notice

The calculators and content provided on this website are for general information purposes only. While we make every effort to provide reliable information, we do not guarantee completeness, accuracy or timeliness. The tools do not replace individual legal, tax, financial, energy or medical advice.