Free tools & calculators
40 free calculators and utilities for IoT builders, marketers, AI teams and founders. They run in your browser and never store what you type.
IoT Battery Life CalculatorEstimate how long a sensor node runs on a battery from its active current, sleep current and wake interval.IoT Data Usage CalculatorWork out the monthly mobile or network data a fleet of connected devices will use.IoT Cloud Messaging Cost EstimatorEstimate the monthly cloud bill for device messages and stored telemetry. Enter your own provider prices.Ohm's Law CalculatorFill in any two of voltage, current, resistance and power and get the other two.LED Resistor CalculatorPick the right current-limiting resistor for an LED and see the nearest standard value.Voltage Divider CalculatorFind the output voltage of a two-resistor divider, handy for scaling sensor signals to an ADC pin.Device Energy Cost CalculatorSee how much electricity a device, gateway or smart-home setup uses and what it costs.Solar & Battery Sizing CalculatorSize the solar array and battery bank for an off-grid sensor site, gateway or home.dBm to mW ConverterConvert radio power between dBm, milliwatts and watts for Wi-Fi, LoRa, BLE and cellular links.IPv4 Subnet CalculatorGet the network address, broadcast address, mask and usable host range for any IPv4 subnet.Data Size Unit ConverterConvert between bits, bytes, KB, MB, GB, TB and the binary KiB, MiB and GiB.Binary, Hex & Decimal ConverterConvert numbers between binary, octal, decimal and hexadecimal — useful for registers and bit masks.ROAS CalculatorCalculate return on ad spend, ROI and the break-even ROAS your campaigns need to hit.CTR, CPC, CPM & CPA CalculatorOne calculator for the core paid-media metrics: click-through rate, cost per click, per thousand views and per acquisition.Marketing ROI CalculatorMeasure the return on any marketing campaign, including agency fees and tools.Customer Lifetime Value & CAC CalculatorCompare what a customer is worth with what it costs to win them, and see your LTV:CAC ratio.Guest Post Budget PlannerPlan a guest-posting campaign: total spend, cost per link and how long referral traffic takes to pay you back.UTM Campaign URL BuilderBuild clean, correctly encoded campaign URLs with UTM parameters for Google Analytics.Meta Title & Description Length CheckerCheck your SEO title and meta description against the lengths Google usually shows, with a live search preview.Word & Character CounterCount words, characters, sentences and paragraphs, and estimate reading and speaking time.Keyword Density CheckerFind the most-used words in any text and how often they appear, to spot over-optimisation.URL Slug GeneratorTurn any title into a clean, SEO-friendly URL slug.Text Case ConverterSwitch text between UPPER, lower, Title, Sentence, camelCase, snake_case and kebab-case.AI API Cost CalculatorEstimate what an LLM-powered feature will cost per request, per day and per month. Enter your model’s current prices.AI Token EstimatorRoughly estimate how many tokens a prompt or document uses and whether it fits a model’s context window.AI Automation ROI CalculatorEstimate the hours and money an AI tool saves your team, net of what the tool costs.EMI CalculatorCalculate the monthly instalment, total interest and total cost of any loan.SIP CalculatorProject the future value of a monthly investment plan, with an optional yearly step-up.Compound Interest CalculatorSee how a lump sum and regular deposits grow with compounding over time.GST / VAT CalculatorAdd or remove GST, VAT or sales tax from a price and see the split.Profit Margin & Markup CalculatorWork out gross profit, margin and markup from your cost and selling price.Break-Even CalculatorFind how many units you must sell before a product or business starts making a profit.Percentage CalculatorQuickly find a percentage of a number, what percent one number is of another, or a percentage change.SaaS MRR & Churn CalculatorTurn customers, price and churn into MRR, ARR, customer lifetime and a 12-month outlook.JSON Formatter & ValidatorValidate JSON from an API or device payload and format it for reading or minify it for sending.Base64 Encoder & DecoderEncode text to Base64 or decode Base64 back to text, with full UTF-8 support.Strong Password GeneratorGenerate random passwords in your browser using the secure random number generator. Nothing is sent or stored.UUID v4 GeneratorGenerate random version 4 UUIDs for device IDs, database keys and API tests.Unix Timestamp ConverterConvert Unix epoch seconds or milliseconds to a readable date, or a date back to a timestamp.HEX, RGB & HSL Color ConverterConvert a colour between HEX, RGB and HSL and preview it.
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