A network of 43+ free, browser-based calculators and utilities from the same team. Every tool runs client-side, with no signup and nothing stored on a server.
Measure square footage for floors, walls, rooms and land across many shapes, with unit conversion handled for you.
Concrete and bulk-material calculators in cubic yards for slabs, footings, columns, walls and stairs, with bag counts and waste margin.
Calculate the volume and capacity of boxes, cartons and rectangular containers in any units for packing and shipping.
Find the volume and fill level of tanks in many shapes — cylindrical, oval, rectangular, capsule — horizontal or vertical.
Compute dimensional (volumetric) weight for FedEx, UPS, USPS and others and compare it against actual weight before you ship.
Measure a package's girth and combined length-plus-girth and check it against carrier oversize limits.
Add, subtract, multiply and divide fractions with full step-by-step working, plus fraction-to-decimal conversion.
Convert and scale cooking measurements between cups, grams, ounces and millilitres, and resize recipes by servings.
Calculate voltage drop and the correct wire gauge for any DC or AC run across NEC, CEC, BS 7671, AS/NZS and IEC standards.
Professional solar sizing and design tools covering the calculations behind planning a photovoltaic system from panels to storage.
Off-grid and backup battery-bank sizing with real usable capacity, C-rate, voltage and chemistry — the engineering sales tools skip.
Size a backup generator or power station to your real loads, including surge and start-up draw, so you neither under- nor oversize.
Work out the air-conditioner tonnage and cooling load a room or whole home needs, based on area, climate, insulation and sun exposure.
Work out network and broadcast addresses, host ranges and subnet sizes from CIDR notation for network planning.
Calculate subnet masks, host counts and address ranges, with worked examples and code snippets in several languages.
See the full lifetime cost of a mortgage or loan — total interest, amortization schedule and the effect of extra payments.
An EMI calculator built for India: home, car and personal loans plus credit-card EMI with GST, and advance vs arrears EMI.
Convert between margin and markup and price products correctly, clearing up the confusion that quietly erodes profit.
Handle every everyday percentage problem — percentage of a number, change, increase, decrease and reverse percentages.
Format, validate, minify and explore JSON in your browser, with a tree viewer that makes large payloads easy to read.
Encode text and files to Base64 or decode them back, entirely client-side so nothing you paste ever leaves your machine.
Percent-encode and decode URLs and query strings so special characters transmit safely, with full Unicode support.
Generate MD5, SHA-1, SHA-256 and other cryptographic hashes from text or files for checksums and integrity checks.
Generate UUIDs in bulk and learn how the different versions work, with copy-ready output for development and testing.
Build, test and understand regular expressions with live matching and a reference that explains each token in plain language.
Build cron schedules visually and read back exactly when a crontab expression will run, with a cheat sheet of common patterns.
Convert between Unix epoch timestamps and human-readable dates in any time zone, in seconds or milliseconds, both directions.
Generate barcodes and QR codes in many formats and export them print-ready as PNG or PDF, all rendered locally.
Strip hidden metadata — EXIF, location, author — from images, PDFs, Office files, audio and video, entirely in your browser.
Merge, split, compress, rotate and password-protect PDF files client-side, keeping documents private on your device.
Convert color codes between HEX, RGB, HSL and more, build palettes and gradients, and export tokens for SwiftUI, Flutter and Compose.
A toolkit of browser-based image utilities for resizing, converting and editing pictures without uploading them anywhere.
Count words, characters, sentences and paragraphs and estimate reading time as you type.
Convert text between upper case, lower case, title case, sentence case and more in one click.
Repeat, duplicate and generate blocks of text quickly, with control over separators and counts.
Convert numbers to words, including the Indian rupee lakh-crore system, for cheques, invoices and documents.
A fast reference and converter for length, weight, volume, temperature and more — the conversions you actually look up.
Add up the hours between start and end times, including overnight spans and breaks, for timesheets and payroll.
Check the current time across world cities and time zones at a glance, for scheduling calls across regions.
Calculate exact age in years, months and days, plus milestones, birthday countdowns and age comparisons.
Test how strong a password is and how long it would take to crack, checked locally and never sent anywhere.
A suite of calorie, macronutrient and body-composition calculators with clear methodology behind every number.
Calculate BMI, BMR and daily calorie needs (TDEE) across activity levels, with goal planning and macro targets.
These are sites in our own network, linked openly with rel="nofollow noopener". We link them because they are built to the same standard, not as paid placements.