Find a calculator.
Useful tools for the questions that come up every day.
RAID Capacity Calculator
Compare nominal usable storage across common RAID layouts.
Open calculatorRange Calculator
For −3, 2, 10 the range is 10 − (−3) = 13.
Open calculatorRatio Calculator
Simplify a two-part ratio or scale it to a new first value.
Open calculatorRequired Internet Speed Calculator
Work backward from a file size and deadline to estimate the connection speed required.
Open calculatorROI Calculator
Include both the initial outlay and additional costs when comparing an investment’s return.
Open calculatorRoom & Wall Area Calculator
Add rectangular room or wall sections and subtract a combined opening area.
Open calculatorSales Tax Calculator
Add a chosen tax rate to a price or extract tax from an inclusive total.
Open calculatorSavings Goal Calculator
Estimate how many monthly deposits are needed to reach a savings target.
Open calculatorScreen PPI Calculator
A 1920 × 1080, 24-inch screen has approximately 91.787799 pixels per inch.
Open calculatorServer RAM Budget Calculator
Check whether planned service allocations fit within a server’s RAM budget.
Open calculatorSimple Interest Calculator
Calculate interest charged or earned only on an original principal.
Open calculatorSpeed Converter
100 km/h is approximately 62.137119 mph.
Open calculatorSplit Bill Calculator
100 plus 10% tip and 5% tax gives 115; between two people the share is 57.50.
Open calculatorStandard Deviation Calculator
For 2, 4, 4, 4, 5, 5, 7, 9 the mean is 5, population variance is 4 and population standard deviation is 2.
Open calculatorStreaming Bandwidth Calculator
100 viewers at 5 Mbps each require 500 Mbps outbound bandwidth and transfer about 225 GB in one hour.
Open calculatorTemperature Converter
0 °C = 32 °F; 100 °C = 373.15 K; −40 °C = −40 °F.
Open calculatorTile Calculator
A 4 × 3 m area with 30 × 30 cm tiles needs 134 whole tiles before waste, or 147 with 10% waste.
Open calculatorTime Converter
1 hour = 60 minutes = 3,600 seconds.
Open calculatorTip Calculator
A bill of 100 with a 15% tip split between two people totals 115, or 57.50 each.
Open calculatorTravel Time Calculator
350 km at 90 km/h takes about 3 hours 53 minutes (3 hours 53 minutes 20 seconds).
Open calculatorVideo Bitrate Budget Calculator
Find the average video bitrate that fits a target file size after budgeting for audio.
Open calculatorVideo Storage Calculator
8 Mbps for 1 hour with no added audio uses approximately 3.6 GB.
Open calculatorVolume Converter
1 US liquid gallon = 3.785411784 L; 1 Imperial gallon = 4.54609 L.
Open calculatorWallpaper Roll Calculator
Plan wallpaper purchases using full-height drops instead of area alone.
Open calculatorPopular calculators
Age Calculator
Find your age in years, months, and days on any given date.
Open calculatorAverage Calculator
Find the arithmetic mean of a list of numbers, with the sum and range shown alongside it.
Open calculatorBMI Calculator
Calculate adult BMI using metric or imperial height and weight.
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