Precision Tools for Every Calculation
Access a comprehensive suite of free, accurate calculators for time, math, science, and health. Designed for speed, ease, and precision.
Featured Tools41
24-Hour Calculator
Convert and calculate time in 24-hour format.
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Add Time Calculator
Add multiple time durations together easily.
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Calorie Deficit Calculator
Calculate calories needed for weight loss.
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Centrifugal Calculator
Calculate RCF (G-force) and RPM for centrifuges.
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Date Calculator
Add or subtract days, weeks, months from a date.
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Date Duration Calculator
Find the exact duration between two dates.
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Date Format Converter
Convert between different date formats.
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Days Ago Calculator
Find what date it was a certain number of days ago.
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Days Calculator
General purpose days and date calculation tool.
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Days From Now Calculator
Calculate dates in the future from today.
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Divide Time Calculator
Split a duration of time into equal parts.
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Final Grade Calculator
Determine what you need on your final exam.
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Fraction to Decimal
Convert any fraction into its decimal equivalent.
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Fraction to Percent
Convert fractions into percentages.
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GCF Calculator
Find the Greatest Common Factor of numbers.
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Grams Moles Calculator
Convert between mass and moles for elements.
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Hours Calculator
Calculate total hours and minutes worked.
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Law of Cosines
Solve triangles using the Law of Cosines.
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Military Time Calculator
Convert between 12-hour and 24-hour time.
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Months Ago Calculator
Find the date from a few months in the past.
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Months Calculator
Count the number of months between dates.
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Months From Now
Calculate a future date by adding months.
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Multiple Time Calculator
Manage and sum multiple time entries.
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Percentage Change
Calculate increase or decrease percentage.
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Percentage Increase
Find the new value after a percentage increase.
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Pythagorean Theorem
Calculate the sides of a right-angled triangle.
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Quarters Calculator
Break down years into quarters.
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Random Number Generator
Generate random numbers within a range.
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Significant Figures
Count and calculate significant figures.
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Square Foot Calculator
Calculate area in square feet for projects.
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Steps to KM Calculator
Convert your daily steps into kilometers.
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Subtract Time Calculator
Find the difference between two durations.
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Time Ago Calculator
Find a timestamp from the past.
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Time Calculator
Universal time calculation engine.
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Time From Now
Calculate future time intervals.
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Upload Time Calculator
Estimate file upload and download times.
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Weeks Ago Calculator
Look back a specific number of weeks.
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Weeks Calculator
Work with week-based time intervals.
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Weeks From Now
Find a date several weeks in the future.
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Years Ago Calculator
Calculate historical dates by years.
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Years Calculator
Calculate the difference between years.
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