UtiliNest.

111 verified tools · 2026 edition

The right tool, right when you need it.

Fast, private calculators and converters for everyday work.

Runs locally No sign-up Reviewed sources US · UK · EU · Global
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Universal ConverterSearch and convert common units instantly.Date DifferenceFind days and weeks between two dates.Tip CalculatorCalculate tips and split the full bill.Percentage CalculatorCalculate percentages, change, and ratios.Mortgage CalculatorEstimate payments and total loan costs.BMI CalculatorCheck adult body mass index and category.JSON FormatterFormat and validate JSON data instantly.Business DaysCount weekdays and exclude your holidays.

Browse by category

Math & Numbers20 tools

Binary, percentages, fractions, statistics, and more.

Unit Converters21 tools

Length, weight, temperature, volume, and more.

Date & Time10 tools

Dates, business days, durations, meetings, and timers.

Everyday Money8 tools

Tips, discounts, tax, loans, interest, and payments.

Electrical20 tools

Ohm’s law, circuits, power, resistance, and more.

Developer Tools20 tools

JSON, Base64, color, hash, and code utilities.

Health & Everyday12 tools

Health screening, text, education, notes, and device tools.

Standards & scope

Useful results, with clear limits.

Every tool identifies its method, applicable region, result type, privacy behavior, and reviewed sources. Review our methodology →