Online calculators for clearer decisions
Compare scenarios, identify longer-term costs and use transparent results to decide what to check next.
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Calculators for specific questions
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Calculator · Home & financingHow much home can I afford?Review the possible purchase price, maximum monthly payment, closing costs and remaining budget buffer.Result:Possible purchase price · maximum monthly payment · closing costs · budget bufferCalculator · Saving & wealthHow could my savings plan grow?Compare contributions, investment gain or loss and today’s purchasing power over time.Result:Final value · Contributions · Gain or loss · Purchasing powerCalculator · Heating & energyWhich heating system costs less over time?Compare upfront and running costs for heat pumps, gas and district heating over the same period.Result:Cost ranking · Annual costs · Total costs · Cost gap
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Calculators by area
Choose finance, energy, everyday life or health and start with the question you need to answer.
FinancePlan financing, savings and retirementCalculate loans and home budgets, review income and plan long-term wealth.EnergyReduce energy costs and compare systemsCompare electricity costs, heating systems, solar, tariffs and mobility costs.EverydayCalculate working time, dates and everyday costsCalculate working time, leave, dates, percentages and travel costs.HealthCalculate and understand BMI and daily energy needsCalculate BMI, basal metabolic rate and calorie needs, and understand what these results can and cannot tell you.
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Calculations, key drivers and model limits — explained concisely.
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Understand results in context
Calc‑World shows the calculation method, the values used and each model’s limits.This makes it clear what the result can tell you and what to check next.