Other calculators
15 calculators
This hub collects tools that do not sit in a larger subject family—utilities and one-off helpers still get a How it works note.
Browse the list for the job you need, or search the catalog if you already know the name. These one-off tools are free and need no account.
Numbers and chance calculators
Primes, random, dice, and GPA planning.
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Dice Roller
Roll one or more dice with a chosen number of sides.
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GPA Planning Calculator
GPA needed in remaining credits to hit a target cumulative GPA.
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Grade Calculator
Weighted class grade from named assignments, tests, and exams — the same GPA-style math as quality points over credits.
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Prime Number Calculator
Check whether an integer is prime.
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Random Number Generator
Generate a random integer in an inclusive min–max range.
Everyday utilities calculators
Height, mileage, download time, and unit price.
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Download Time Calculator
Estimate download duration from file size and link speed.
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Gas Mileage Calculator
Miles per gallon (and L/100 km) from distance and fuel used.
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Height Calculator
Convert height between centimeters and feet/inches.
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Pregnancy Calculator
Estimated due date and gestational age from LMP (Naegele).
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Tip For Groups Calculator
Tip and per-person total for a shared bill.
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Unit Price Compare Calculator
Compare unit prices of two packages.
Text and network calculators
Text stats, IP subnets, and related helpers.
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Aspect Fit Calculator
Scale an image to fit inside a box (contain).
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IP Subnet Calculator
IPv4 network, netmask, broadcast, and host count from CIDR.
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Password Entropy Calculator
Bits of entropy from length and charset size (with presets).
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Text Stats Calculator
Live character, word, sentence, line, and reading-time stats.