Free tools, no signup

Calculate square footage of rooms, floors, walls, and irregular spaces. Useful for flooring, paint, and renovation estimates.

Every percentage calculation in one place — percent of, percent change, increase/decrease, tip, discount, and more.

Exact age in years, months, days, hours, and minutes from any birthdate. Plus age difference between two dates.

Calculate hours between two times. Useful for timesheets, billing, and project tracking.

Compute volume of any box from length, width, and height. Supports multiple unit systems and conversions.

Calculate dim weight for shipping by FedEx, UPS, and USPS. Compare against actual weight to find billable weight.

Calculate package girth for shipping — needed for oversize fee thresholds on most carriers.

Quick-reference conversion sheets for length, weight, temperature, area, volume, and more.

Encode or decode Base64 strings instantly. Handles UTF-8, supports file upload, and runs entirely in the browser.

URL-encode or URL-decode any string. Useful for query parameters, escape characters, and debugging APIs.

Format, validate, minify, and compare JSON. Tree view, error highlighting, and copy-to-clipboard.

Generate UUIDs (v1, v4, v5) in bulk. Validate UUID strings and inspect their version and variant.

Compute MD5, SHA-1, SHA-256, SHA-512, and other hashes for any string or file.

Convert between Unix epoch timestamps and human-readable dates. Supports milliseconds and multiple timezones.

Regular expression reference and tester. Cheat sheet, common patterns, and live regex playground.

Build and decode cron expressions. Shows the next 10 run times for any schedule.

Test password strength against common attacks. Estimates time-to-crack and suggests improvements.

Count words, characters, sentences, and paragraphs. Reading time estimate and keyword density.

Repeat any text N times with optional separators. Useful for testing, mockups, and bulk content generation.

Convert text between camelCase, snake_case, kebab-case, PascalCase, UPPER, lower, Title Case, and more.

Resize, crop, compress, and convert images in the browser. No upload — runs entirely on your device.

Synchronized world clock and meeting time finder for distributed teams.

Calculate, split, and visualize subnets. IPv4/IPv6, VLSM planner, cloud-aware reserved IPs, and Terraform export.

Network and broadcast addresses, usable host range, wildcard masks, and VLSM planning for IPv4 and IPv6.

Free, unbiased solar and off-grid calculators — system sizing, savings and payback, and battery banks.

Strip EXIF, GPS, and hidden metadata from images, PDFs, and Office files — locally in your browser.

EMI for home, car, and personal loans in India, with a full amortization schedule and prepayment impact.

Total interest paid over the life of a loan, comparing terms and rates with a full amortization breakdown.

Project mutual-fund SIP returns, step-up SIPs, and goal-based investing, with maturity value and charts.

Compute semester and cumulative GPA on 4.0 and weighted scales, converting letter grades and percentages.

Add, subtract, multiply, and divide fractions with step-by-step working, simplification, and decimals.

Estimate daily calorie needs, TDEE, and macros — BMR-based targets for loss, maintenance, or gain.

Calculate BMI, BMR, and daily calorie needs in metric or imperial, with healthy-weight ranges.

Size an air conditioner by room area, climate, and occupancy — BTU and tonnage estimates for any space.

Volume and fill level for cylindrical, rectangular, and oval tanks — horizontal or vertical, litres or gallons.

Cubic yards for concrete, mulch, gravel, soil, and sand from your dimensions in any units.

Pool volume in gallons or litres for rectangular, round, and oval pools, with dosing help for chemicals.

Concrete volume plus cement, sand, and aggregate quantities — slabs, footings, and bags by mix ratio.

Roofing squares, shingle bundles, and underlayment from area and pitch, with a waste factor built in.

Stair rise, run, stringer length, and headroom to code, with a diagram for carpentry and deck building.

A hub of construction calculators — concrete, framing, drywall, paint, and more, with material estimates.

Voltage drop and correct wire size for AC and DC circuits, with NEC and IEC formulas.

Size an off-grid battery bank from daily load, autonomy days, and depth of discharge, with lithium presets.

Estimate UPS and generator runtime from load and battery capacity, for home, office, and server racks.

Convert cooking measurements between cups, grams, ounces, and millilitres, with recipe scaling.

Merge, split, compress, convert, and rotate PDFs in your browser — no uploads, files stay on your device.

Convert between HEX, RGB, HSL, and CMYK, build palettes, check contrast, and copy ready-to-paste CSS.

Generate QR codes and barcodes (Code 128, EAN, UPC), downloadable as PNG or SVG for print and labels.

Test download, upload, ping, and jitter right in the browser — quick, accurate, no app to install.

See your public IPv4 and IPv6 address, ISP, and approximate location, plus request headers.

Look up domain WHOIS, registrar, name servers, expiry dates, and DNS records for any domain.

Convert numbers to words for cheques, invoices, and legal documents, with currency wording support.