Explore the numbers behind modern tech — track transistor scaling with the Moore's Law Calculator, estimate the environmental cost of compute with the AI Water Footprint and Cryptocurrency Footprint calculators, decode storage specs with the Byte Conversion Calculator, and compare screens side by side with the Pixel Density (PPI) Calculator.
The list is ordered by real usage so the most-reached-for tools are right up front. Flip to the Trending tab to see what's generating interest today. Every calculator is free, no account required, and works on any device.
- Construction Calculator
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Bitcoin Mining Profit CalculatorEstimate Bitcoin mining profit per day, month and year from hash rate, power use, electricity cost, BTC price, network difficulty and pool fee.
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Crypto Mining Profitability CalculatorEstimate GPU crypto mining profit from your hashrate, network hashrate, block reward, coin price, power draw and electricity rate. Daily, monthly and yearly.
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CCTV Storage CalculatorCalculate how much disk space your IP CCTV cameras need. Enter bitrate, recording hours, cameras and retention days to get total GB and TB.
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Megabits to Megabytes per Second ConverterConvert Megabits per second (Mbps) to Megabytes per second (MB/s) instantly. Just divide by 8 — find your real download speed in seconds.
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LLM VRAM Requirement CalculatorEstimate the GPU VRAM (GB) needed to run or serve a large language model from its parameter count, precision, and overhead factor.
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PC Power Supply (PSU) Wattage CalculatorEstimate the right PSU wattage for your PC build. Add CPU, GPU, RAM, storage and fans to get a recommended power supply size with 20% headroom.
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Video File Size CalculatorEstimate video file size from total bitrate and clip length. Get the result in MB and GB instantly for export, upload, and storage planning.
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DPI CalculatorCalculate DPI (dots per inch) for printing from your image's pixel dimension and the intended print size in inches. Free print resolution tool.
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RGB to Hex Color ConverterConvert RGB color values (0-255) to a hex color code instantly. Enter Red, Green and Blue to get the #RRGGBB hex used in CSS and web design.
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Hex to Decimal ConverterConvert any hexadecimal (base 16) number to decimal (base 10) instantly. Enter a hex value like 1A3F and get the exact decimal result with the formula.
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Hex Color to RGB ConverterConvert any hex color code (e.g. #3498DB) to its RGB values instantly. Supports 3- and 6-digit hex codes with a live color swatch preview.
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IP Subnet Mask CalculatorFree IPv4 subnet calculator. Enter an IP and CIDR prefix to get the subnet mask, network & broadcast address, usable host count, and full host range.
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LLM VRAM Requirement CalculatorEstimate the GPU VRAM needed to run a large language model. Enter parameters in billions and choose FP16, 8-bit, or 4-bit quantization.
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Decimal to Binary ConverterConvert any decimal (base-10) number to binary (base-2) instantly. See the binary digits and bit count using the divide-by-2 remainder method.
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Uptime / SLA Downtime CalculatorCalculate allowed downtime for any SLA uptime percentage (99%, 99.9%, 99.99%) per day, week, month, quarter or year in seconds, minutes, hours and days.
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LLM Tokens to Words & Cost CalculatorConvert LLM tokens to an estimated word count and compute API cost from a price per 1,000 tokens. Quick estimate for GPT, Claude and other models.
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Amdahl's Law Speedup CalculatorCalculate theoretical speedup with Amdahl's Law. Enter the parallel fraction and processor count to find overall speedup, max speedup, and efficiency.
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Video Bitrate Calculator from Target File SizeCalculate the video bitrate needed to fit a clip into a target file size. Enter MB and duration to get kbps, with optional audio bitrate subtraction.
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Screen Size from Diagonal CalculatorConvert a TV or monitor diagonal size and aspect ratio into real screen width, height and area. Supports 16:9, 21:9, 4:3 and any custom ratio.
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Password Entropy CalculatorCalculate password entropy in bits from length and character set. Estimate how strong and hard to crack your password is using log2 of the charset size.
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Qubit States CalculatorCalculate the number of quantum states 2^n that n qubits can represent. Free qubit states calculator showing the exponential power of quantum computing.
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Cloud Data Storage Cost CalculatorEstimate your cloud data storage costs. Enter storage size in GB, price per GB/month, and duration to get total, monthly, and annual cost.
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LLM API Cost CalculatorEstimate LLM API costs from input/output tokens and per-1K-token prices. Calculate cost per request and total spend across many requests.
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Charging Time CalculatorEstimate how long it takes to charge a battery from its mAh capacity, charger output in mA, and charging efficiency. Free, instant results.
Frequently asked questions
What kinds of technology questions can I answer here?
This section covers hardware performance metrics, storage unit conversions, display quality analysis, and environmental impact of computing. You can model Moore's Law transistor growth, compare PPI across screens, convert bytes to gigabytes, and explore the water or carbon footprint of AI inference and crypto mining.
How accurate are the results?
Each calculator uses published formulas and well-established reference values — Moore's Law growth rates, standard display math, official storage conversion factors. Results are accurate for educational and planning purposes. For critical technical work, always cross-check against the manufacturer's specifications or an authoritative technical standard.
Do you store the data I enter?
No. All calculations run in your browser. Nothing you input is transmitted to our servers or retained in any way.
Which technology calculators are most popular?
The Byte Conversion Calculator and Pixel Density (PPI) Calculator are among the most visited, along with the Computer Storage Units Conversion Calculator. The list is ordered by real usage, and the Trending tab highlights whichever tools are spiking in popularity right now.
Are these tools free to use?
Yes — entirely free, no sign-up, no subscription. Open any tool on your phone, tablet, or desktop and start calculating immediately.
