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Currency Calculator

Convert between major world currencies using live exchange rates.

Financial Calculators

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Percent Off Calculator

Calculate the sale price after a percentage discount. Find the final price, savings amount, and what…

Financial Calculators

🎨

Paint Calculator

Calculate how many gallons of paint you need for any room based on wall and ceiling…

Construction

📝

Grade Calculator

Calculate your current grade, the grade you need on the final exam, and weighted averages.

Education & GPA

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GPA Calculator

Calculate your GPA on a 4.0 scale. Add courses with letter grades and credit hours.

Education & GPA

🚀

Speed Distance Time Calculator

Calculate speed, distance, or time when you know any two of the three values.

Engineering

⚡

Ohms Law Calculator

Calculate voltage, current, resistance, and power using Ohms Law and Watt's Law.

Engineering

🔄

Unit Converter

Convert between units of length, weight, temperature, area, volume, speed, and pressure.

Engineering

⏳

Countdown Timer

Calculate time remaining until any future event — birthday, holiday, deadline, or custom date.

Date & Time

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Hours Calculator

Calculate total hours worked between two times, overtime, and weekly hours.

Date & Time

⏱️

Time Calculator

Add or subtract time values, convert between time units, and calculate time durations.

Date & Time

📅

Date Calculator

Calculate the number of days between two dates, add or subtract days from a date, and…

Date & Time