Free online tools

A handpicked collection of fast, free, browser-based utilities. No signup, no install, no clutter — just useful tools for everyday tasks.

Everyday calculators

For the math you don't want to do twice

Calculate Hours

Free time and pay calculators — hours, overtime, time zones, age.

Calculate area of rooms, lots, and surfaces in any unit.

Percentage Calculator

Every percentage variant — increase, decrease, difference, of a number.

Exact age in years, months, days, hours — between any two dates.

Unit Cheatsheet

Engineering and scientific unit reference, converters, and charts.

Margin vs Markup

Convert between profit margin and markup, with fees, shipping, tax, and break-even.

DIM Weight Calculator

Dimensional (billable) shipping weight for FedEx, UPS, USPS, DHL and more carriers.

Box Volume Calculator

Volume of a box from length, width, and height in any units. For shipping and packing.

Girth Calculator

Parcel length-plus-girth against carrier limits, plus body circumference for fitness.

Solar Calculator

Free, unbiased solar and off-grid calculators — sizing, savings, payback, and batteries.

EMI Calculator (India)

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

Total Interest Calculator

Total interest paid over the life of a loan, comparing terms and rates.

Project mutual-fund SIP returns, step-up SIPs, and goal-based investing.

Semester and cumulative GPA on 4.0 and weighted scales, with grade conversion.

Fraction Calculator

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

Calorie Calculator

Estimate daily calorie needs, TDEE, and macros for loss, maintenance, or gain.

BMI & BMR Calculator

Calculate BMI, BMR, and daily calorie needs in metric or imperial units.

AC Tonnage Calculator

Size an air conditioner by room area and climate — BTU and tonnage estimates.

Tank Volume Calculator

Volume and fill level for cylindrical, rectangular, and oval tanks.

Cubic Yardage Calculator

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

Pool Volume Calculator

Pool volume in gallons or litres for rectangular, round, and oval pools.

Concrete Material Calculator

Concrete volume plus cement, sand, and aggregate quantities by mix ratio.

Roofing Material Calculator

Roofing squares, shingle bundles, and underlayment from area and pitch.

Stair Calculator

Stair rise, run, stringer length, and headroom to code, with a diagram.

Construction Calculators

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

Voltage Drop Calculator

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

Solar Battery Bank Calculator

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

Backup Power Calculator

Estimate UPS and generator runtime from load and battery capacity.

Cooking Measurement Converter

Convert cooking measurements between cups, grams, ounces, and millilitres.

Text & writing utilities

For words, not numbers

Count words, characters, sentences, and reading time as you type.

Repeat any text N times with optional separators. For testing or formatting.

Password Strength

Test how strong a password is and how long it would take to crack.

Convert text between Title Case, sentence case, camelCase, snake_case, kebab-case, and more.

Number to Words

Convert numbers to words for cheques, invoices, and legal documents.

Developer utilities

For when you just need it now

Base64 Encode / Decode

Convert text and files to and from Base64. Supports UTF-8 and data URLs.

URL Encode / Decode

Percent-encode or decode URLs and query parameters.

Format, validate, minify, and convert JSON. Diff two files side by side.

Generate MD5, SHA-1, SHA-256, SHA-512 hashes from text or files.

Generate UUID v1, v4, v7 and other versions. Bulk generation supported.

Epoch / Unix Time

Convert between Unix timestamps and human-readable dates.

Build and decode crontab expressions with plain-English explanations.

Build and test regular expressions with a reference and live explanations.

CIDR Calculator

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

Subnet Mask Calculator

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

Picture Toolkit

Browser-based image tools — compress, convert, resize, crop. Files never leave your device.

Remove Metadata

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

Merge, split, compress, convert, and rotate PDFs in your browser — no uploads.

Convert between HEX, RGB, HSL, and CMYK, with palettes, contrast checks, and CSS values.

Barcode & QR Generator

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

Internet Speed Test

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

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

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