🧮 Calculators
Percentage, loan, mortgage, BMI, age, interest and everyday calculators with the formula shown.
7 working tools in this category · 57,769 tools platform-wide
Popular Calculators
Percentage Calculator
Calculate percentages three ways: what % of a number, a value as % of another, and percentage increase/decrease — with the formula shown.
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BMI Calculator
Calculate Body Mass Index from weight and height and show the standard WHO category.
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Age Calculator
Calculate exact age in years, months and days from a date of birth, plus total days lived.
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Tip Calculator
Calculate a tip and split the bill between people.
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Electricity Cost Calculator
Estimate appliance electricity cost from watts, hours per day and your price per kWh.
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Calorie Calculator
Estimate daily calories with the Mifflin–St Jeor BMR equation and activity multipliers.
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Date Calculator
Calculate the exact number of days, weeks and months between two dates.
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Calculators — FAQs
Are these calculators free?
Yes, basic use is free and does not require an account.
Is my data private?
Browser-based tools process everything on your device. Any tool that needs a server or external service states that on its own page.
Authoritative resources
- Consumer Financial Protection Bureau — Plain-language money guides from the US consumer finance regulator.