// the free-tools network

Free tools, no signups, no nonsense

bmibmrcalc is one of 52 independent tools built and maintained by the same maker. Each does a single job well, runs in your browser, and works without an account.

In-browser first — wherever technically possible, your data is processed locally and never uploaded. No accounts, no paywalls — every tool is usable the moment the page loads. Published methodology — calculators show their formulas and assumptions, so you can check the math instead of trusting it.

// Calculators & everyday

Square Footage Calculatorthesquarefootagecalculator.comWork out the area of rooms, walls, floors, and irregular spaces, then estimate how much flooring, paint, or material you'll need to cover them — with support for complex multi-section layouts.Percentage Calculatorbestpercentagecalculator.netSolve any percentage problem in one place: percentage of a number, percentage increase or decrease, percentage change between two values, and reverse percentage — each with the working shown.Age Calculatortheagecalculator.netFind an exact age in years, months, weeks, and days from any birth date, calculate the difference between two dates, and discover birthday twins who share your special day.Hours Calculatorcalculatehours.netAdd up time between clock-in and clock-out, build simple timesheets, and total worked hours across a day or week — handy for shift work, freelancing, and payroll checks.World Clockclockwithus.comSee the current time across cities and time zones at a glance, compare hours between locations, and plan calls or meetings without doing the time-zone maths yourself.Unit Cheat Sheetunitcheatsheet.comConvert between metric and imperial units fast — length, weight, volume, temperature, and more — with clean, printable reference sheets you can keep beside you while you work.Box Volume Calculatorboxvolumecalculator.comCalculate the volume and capacity of boxes and containers from their dimensions, useful for shipping, storage planning, and figuring out how much will fit inside a given space.Girth Calculatorgirthcalculator.comMeasure parcel girth for shipping carriers that price by length-plus-girth, and handle body-measurement girth calculations for fitness tracking — both in one simple tool.Cubic Yardage Calculatorcubicyardage.comEstimate concrete, gravel, mulch, soil, and other bulk materials in cubic yards from your project's dimensions, so you order the right amount without costly over- or under-buying.Tank Volume Calculatortankvolumecalc.comCompute the total capacity and the current fill volume of tanks in many shapes — cylindrical, rectangular, oval, and more — for fuel, water, and storage applications.AC Tonnage Calculatoractonnagecalc.comSize air-conditioning correctly with browser-based HVAC tools: AC tonnage, BTU load, whole-house sizing, and a model-number decoder, all as estimates to confirm with a contractor.CaloriesKitcalorieskit.comA full calorie and nutrition toolkit: TDEE and macro calculators with honest activity inputs, GLP-1 and meal-planning tools, and a visual meal slotter to turn targets into real food.Fraction Calculatorfractionsteps.comAdd, subtract, multiply and divide fractions and mixed numbers with every step of the working shown, so you can follow the method. Built for homework, recipes and workshop measurements that refuse to become tidy decimals.GPA Calculatorgpacalculatorhq.comWork out grade point average and cumulative CGPA from letter grades and credit hours across common 4.0 and percentage scales. Track where you stand and calculate the marks you still need to reach a target.Cooking Measurement Convertermeasurechef.comConvert cups, grams, ounces, millilitres, tablespoons and teaspoons for any recipe, ingredient by ingredient. Scale servings up or down and switch between metric and imperial without the usual kitchen guesswork.Stair Calculatorstaircalculators.netWork out stair rise, run, stringer length and the number of steps to meet building-code comfort and safety limits. Plan a safe, comfortable staircase precisely before any timber is cut.Concrete Material Calculatorconcretematerialcalc.comEstimate the concrete, cement, sand and aggregate needed for slabs, footings, columns and paths, with the right mix ratio. Plan a pour and buy the correct number of bags without over-ordering.Roofing Material Calculatorroofingmaterialcalc.comEstimate shingles, underlayment and other materials from your roof's area and pitch, with waste factored in. Budget a re-roof accurately and reduce the leftover bundles you would otherwise pay for.Construction Calculatorsconstructioncalchq.comA hub of construction calculators covering materials, areas, volumes and project estimates in one place. The everyday jobsite math — concrete, framing, fill, coverage — that builders and DIYers reach for repeatedly.Pool Volume Calculatorpoolvolumecalc.comFind the water volume of a swimming pool in gallons or litres for rectangular, round, oval and irregular shapes with varying depths. The number behind dosing chemicals, sizing a heater and estimating refills.

// Finance & business

Total Interest Calculatortotalinterestcalc.comSee the true lifetime cost of a mortgage or loan, including total interest paid, with live market rates, extra-payment scenarios, and a payoff-versus-invest comparison.Margin vs Markupmarginvsmarkup.comStop confusing margin with markup: enter cost and price to get both instantly, work backwards from a target margin to set prices, and keep your pricing maths honest.India EMI Calculatorindiaemi.comCalculate loan EMIs, check eligibility, and view a full amortization schedule built for Indian borrowers, including advance-versus-arrears options and credit-card EMI with GST.Dimensional Weight Calculatordimweightcalc.comFind your billable dimensional weight across 17 carriers so you're never surprised by shipping costs — compare actual versus dim weight and pick the cheaper basis.Pro Solar Calculatorprosolarcalc.comSize a solar system to your energy use, then estimate savings and payback period, helping you judge whether panels make financial sense for your home or site.Solar Battery Bank Calculatorsolarbatterybankcalc.comPlan an off-grid setup end to end: size your battery bank and solar array from your loads and location's sun hours, with a five-stage workflow and a large city PSH dataset.Voltage Drop Calculatorvoltdropcalc.comCalculate electrical voltage drop over a run, size conductors correctly, and check against NEC references — with inspector-ready PDF output for electrical work.SIP Calculatorsipcalculatorhub.comProject the maturity value of a mutual-fund SIP from your monthly contribution, expected return and tenure, with optional annual step-ups. See how compounding builds the corpus year by year for realistic goals.Backup Power Calculatorbackuppowercalc.comSize a generator or battery backup from the combined wattage of the appliances you need to run and how long you need them. Plan for outages without buying far more capacity than you'll use, or far too little.

// Developer tools

Base64 Encode / Decodebase64decode.toolsEncode text and files to Base64 or decode them back, entirely in your browser so nothing is uploaded — useful for data URIs, debugging, and moving binary data through text channels.URL Encode / Decodeurlencodedecode.comPercent-encode and decode URLs, query strings, and individual components so special characters travel safely, with whole-URL and component-only modes for precise control.UUID Generatoruuidcore.comGenerate UUIDs and GUIDs in bulk across all common versions, copy them in the format you need, and produce unique identifiers for databases, testing, and code.JSON Toolsjsontools.toolsFormat, validate, minify, and repair JSON, then explore it in an interactive tree view — a fast way to read messy API responses and catch syntax errors at a glance.Hash Generatorhashgenerator.toolsCompute MD5, SHA-1, SHA-256, SHA-512, and more, all client-side, for verifying file integrity, comparing checksums, and generating hashes without sending data anywhere.Epoch Time Converterepochtime.toolsConvert Unix timestamps to human dates and back, across seconds and milliseconds, with ready-to-copy code snippets for handling epoch time in your language of choice.Crontab Cheat Sheetcrontabsheet.comBuild, decode, and validate cron expressions with plain-English explanations of what each schedule actually does, so your scheduled jobs run exactly when you intend.Regex Guideregexguide.comLearn, test, and reference regular expressions interactively — match against sample text, understand each token, and keep a handy reference for common patterns.Transform Casetransformcase.comConvert text between camelCase, snake_case, kebab-case, Title Case, UPPER, lower, and more in one click — a quick fix for renaming variables and tidying strings.Text Repeatertextrepeat.netRepeat, join, and multiply text patterns any number of times — useful for generating test data, filler content, and quickly producing repetitive strings.Color Code Kitcolorcodekit.comAn OKLCH-native color toolkit: build palettes and design tokens, convert between color formats, check WCAG contrast, and export ready-to-use values for your projects.CIDR Calculatorcidrcalculator.netWork out CIDR blocks, address ranges, and subnet math for network planning, with a VLSM planner and infrastructure-as-code export for engineers.Subnet Mask Calculatorsubnetmaskcalc.netCalculate subnet masks, network and broadcast addresses, and usable host ranges, with code examples to help you subnet quickly and correctly.Number to Wordsnumtotext.comConvert numbers into their written-out words for cheques, invoices, contracts and legal documents. Handles currency formatting and very large figures so the written amount always matches the digits exactly.Internet Speed Testcheckinternetspeed.toolsMeasure your download, upload and ping speed straight in the browser, with a clear read on latency and throughput. A fast way to check whether a connection is performing as it should before you call the provider.What Is My IPcheckmyipnow.comSee your public IP address along with the location, ISP and browser details that any website can detect. Handy for troubleshooting connections, confirming a VPN is working and setting up remote access.WHOIS Lookupwhoislookuppro.comLook up domain registration, ownership, expiry dates and DNS records for any website. Useful for buying domains, keeping track of your own renewals and researching who is behind a site.

// Text, files & privacy

Word Counterwordcounterfree.comCount words, characters, sentences, and paragraphs instantly, plus estimated reading time — ideal for essays, articles, and meeting length limits or SEO snippets.Password Strengthpasswordstrength.netTest how strong a password really is, entirely on your device so nothing is transmitted, and get clear feedback on what makes it weak and how to improve it.Pic Toolkitpictoolkit.comConvert, resize, crop, and lightly edit images privately in your browser — no uploads — for quick changes to photos and graphics without installing software.Remove Metadataremovemetadata.toolsStrip EXIF and other hidden metadata from your files entirely in-browser, removing location and device details before you share photos and documents publicly.Core PDF Toolscorepdftools.comMerge, split, compress, and convert PDFs client-side, keeping your documents on your own device while you reorganise, shrink, or transform them.Barcode & QR Generatorbarcodeandqr.comGenerate barcodes and QR codes for products, links, and labels, with customisation options and PDF export so they're ready to print or share.

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