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Calculators for computer science and everyday maths

These calculators are built for the questions that come up in networking labs, computer-architecture courses and daily IT work — converting between number bases, splitting an address block into subnets, or working out how long a 40 GB download will really take.

Where it helps, the calculators show their working (the binary of each octet, the two's-complement form of a number) so they are useful for checking homework rather than just producing an answer.

Number systems

Binary, hex, octal and bit-level arithmetic.

Number Base ConverterConvert between binary, decimal, hex and octal instantly — handles huge numbers exactly.Local Bitwise CalculatorAND, OR, XOR, NOT and shifts at 8 to 64-bit width, with two's-complement signed results.Local Text ⇄ ASCII / Unicode ConverterTurn text into ASCII or Unicode codes in decimal, hex or binary — and decode them back.Local

Networking and storage

Addressing, units and transfer times.

IP Subnet CalculatorNetwork, broadcast, mask, wildcard, host range and usable hosts from any IP and CIDR prefix.Local IPv6 Subnet CalculatorNetwork, range, exact address count, type and ip6.arpa zone for any IPv6 prefix, plus splitting into smaller subnets.Local VLSM CalculatorDivide an IPv4 network into subnets sized by host count, with masks, usable ranges, broadcasts and the leftover free blocks.Local Data Storage ConverterConvert bits, bytes, KB, MB, GB, TB — and the binary KiB/MiB/GiB family — exactly.Local Download Time CalculatorHow long a file takes at your connection speed — and why Mbps isn't MB/s.Local Chmod CalculatorClick permissions or type octal — get 755, rwxr-xr-x and the exact command both ways.Local

Everyday

Percentages, grades and dates.

Percentage CalculatorX% of Y, X is what % of Y, percentage change, increase or decrease by a percent and percentage difference, with the formula shown.Local GPA / CGPA CalculatorCredit-weighted GPA on 10-point or 4-point scales, with the common CGPA-to-percentage rule.Local Date Difference & Age CalculatorDays, weeks and months between two dates, business days with your holidays, and exact age with next birthday.Local

Good to know

Precision

Integer conversions use JavaScript BigInt where needed, so values larger than 2^53 convert exactly.

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