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Calcufetti

Smart calculators for everyday decisions.

Calculate, understand and save your results.

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Useful tools

Browse calculators by category

All current calculators are listed here, with the full catalog one click away.

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Everyday Math

Percentage Calculator

Find a percentage of any number using exact decimal arithmetic.

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Percentage Change Calculator

Measure how much a value increased or decreased between two points.

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Discount Calculator

Calculate the final price, amount saved and effective discount.

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Money

Loan Payment Calculator

Estimate a fixed monthly payment and the total interest paid.

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Compound Interest Calculator

See how a starting balance grows when interest is added repeatedly.

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Dates & Time

Date Difference Calculator

Count the calendar distance between two dates in useful formats.

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Measurement tools

Convert measurements

Start with the live Length Converter and follow the complete converter launch set.

Length Converter

Convert metres, feet, miles and other common length units.

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Problem solving

Solve a specific problem

Focused pages turn a real-world question into a clear calculation and practical answer.

How much did the price increase?

Compare an old and new price and understand both the percentage and money difference.

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