Other free, browser-based tools from the team behind cidrcalculator.net. Calculators, encoders, developer references, time and text utilities — all ad-supported, no signup, no install.
Quick subnet-mask reference and prefix conversions. The companion site for fast lookups when you don't need the full calculator.
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.
Compute square footage for rooms, flooring, paint, and landscaping projects in any unit.
Percent of, percent change, discount, tip, and reverse-percentage calculations.
Exact age in years, months, weeks, days, hours, and minutes from any birthdate.
Time-card math: hours between two times, totals across a week, with optional break deductions.
Shipping dim weight for UPS, FedEx, USPS, and DHL. See which weight a carrier will actually bill.
Cubic feet, inches, meters, and centimeters. For shipping, storage, and packaging planning.
Length + girth for parcel sizing rules. Includes carrier limits and oversize thresholds.
Convert between margin and markup percentages with worked examples for retail and wholesale.
Free, unbiased solar and off-grid calculators — system sizing, savings and payback, and battery banks.
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.
Encode or decode Base64 strings. Handles URL-safe variants and binary files.
Percent-encode and decode URL parameters and full URIs. Component-aware encoding.
MD5, SHA-1, SHA-256, SHA-512, and other hash algorithms for text and files.
Format, minify, validate, and diff JSON. Tree view with path copying and key search.
Generate UUIDs in versions 1, 4, and 7. Bulk generation and format options.
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.
Word, character, sentence, and paragraph counts with reading time estimates.
Repeat a string N times with separators. Useful for generating test data and placeholders.
camelCase, snake_case, kebab-case, PascalCase, Title Case, and more. Side-by-side preview.
Browser-based image utilities: resize, compress, convert, and crop without uploading to a server.
Merge, split, compress, convert, and rotate PDFs in your browser — no uploads, files stay on your device.
Convert numbers to words for cheques, invoices, and legal documents, with currency wording support.
Cron expression builder and reference with human-readable explanations and common recipes.
Regex syntax reference with worked examples, tester, and common pattern library.
Unit conversion reference across length, weight, volume, temperature, energy, and data.