Web Utilities & Everyday Calculators

Calculate electricity cost and power bill usage by device or appliance. Estimate kWh consumption, compare running costs, and forecast monthly utility bills.

Calculate electric vehicle charging time, electricity cost, and added range across Level 1, Level 2, and DC fast chargers. Features 80% taper curve, AC OBC bottlenecking, and gas savings parity.

Alcohol dilution calculator to calculate exact water needed to dilute spirits, moonshine, or ethanol to any target ABV or proof with volume contraction physics.

Stair stringer calculator for exact rise, run, stringer length, and cut layout. Calculate throat depth, bottom riser reduction, framing square marks, and IRC code.

Compare tire sizes side by side with instant diameter, width, sidewall, circumference, and speedometer error calculations. Inspect clearance and speed reading.

Calculate sand and gravel tonnage from dimensions or cubic yards instantly. Estimate tons, tonnes, truckloads, and material costs with custom bulk density.

Calculate wire size and ampacity instantly. Size copper and aluminum AWG conductors with NEC tables, calculate voltage drop, and apply conduit derating.

Calculate exact 2-stroke gas and oil mix ratios for chainsaws, dirt bikes, and outboards. Convert 50:1, 40:1, 32:1 in oz or ml with instant fuel rebalancing.

Calculate precise sourdough hydration, baker's percentages, and water-to-flour ratios. Factor starter hydration, multi-grain flours, salt, and batch loaf yields.

Calculate safe meat internal temperature, resting carryover heat rise, and target pull time. Features USDA food safety charts, doneness presets, and audio timer.

Calculate concrete slab volume in cubic yards or meters, plus bags, rebar, gravel base, and cost. Instant estimates with waste margin for patios and driveways.

Calculate potting soil volume for pots, planters, and raised beds. Convert quarts, cubic feet, and liters to exact bag counts with compaction and cost estimates.

Calculate roofing shingles, squares, and bundles with pitch multipliers, waste factor, ridge caps, starter shingles, nails, and material cost takeoff.

Calculate gas mileage and MPG fuel economy instantly. Track trip gas cost, compare US and UK gallons, convert L/100km, and estimate annual commute fuel spending.

Calculate engine horsepower from torque and RPM, or convert wheel horsepower to crank BHP with drivetrain loss. Estimate quarter-mile ET and speed instantly.

Calculate dew point, relative humidity, and vapor pressure from air temperature and moisture. Solve psychrometric comfort, mold risk, and condensation thresholds.

Calculate board footage, lumber tally cutting lists, material costs, and shipping weights. Supports hardwood quarter sizing (4/4 to 16/4), softwood framing (2x4, 2x6), waste margins, and metric m³ conversion.

Find the exact dog crate size and kennel dimensions by nose-to-tail length, standing height, or breed. Features puppy divider setup & IATA airline travel rules.

Calculate exact clothing quantities with our clothing packing multiplier. Plan trip wardrobes by laundry cycles, climate buffers, trip days, and bag weight limits.

Calculate dog and human calories burned walking by distance, time, and pace. Features canine RER energy metrics, dog treat burn-off, and leash resistance.

Calculate exact aquarium gross and net water volume, allometric fish stocking bioload, substrate displacement, filtration turnover, and total floor weight.

Convert international shoe sizes across US, EU, UK, and JP with precision foot measurement, brand fit adjustments, width charts, and printable sizing matrices.

Convert oven cooking times and temperatures to air fryer in seconds. Factor in convection airflow, food density, basket crowding, and flip reminder intervals.

Calculate candle wax, fragrance oil load, and dye quantities per jar or batch. Convert container water weight using wax density shrinkage factors accurately.

Calculate how many pizzas to order for your party by guest headcount, appetite, and crust style. Compare pizza sizes, deal pricing, and slices per person.

Calculate electric appliance running costs per hour, day, month, and year. Compare wattage, duty cycles, standby power, TOU rates, and energy payback ROI.

Room AC BTU calculator and air conditioner sizing tool by room square footage, ceiling height, and sunlight. Get instant cooling capacity, tonnage, and power.

Calculate exact coffee-to-water ratios, ground dose, and liquid yield. Scale pour-over, French press, espresso, and cold brew with SCA Golden Cup standards.

Calculate USDA turkey thaw times, oven roast duration, resting carryover, and Thanksgiving dinner countdown schedule for stuffed, unstuffed, and spatchcock birds.

Calculate exact chilling times for beer, wine, cans, and bottles in the freezer, fridge, or ice bath. Features explosion safety timers and rapid chill hacks.

Calculate your cat's exact daily calorie needs (RER & DER), wet and dry food portion split, and safe weight loss goal. Includes BCS 1-9 guide and feeding schedules.

Calculate exact lawn fertilizer spreader settings, pounds per 1,000 sq ft, and bags needed based on N-P-K grade, turf area, and spreader calibration pass rates.

Calculate mulch and gravel volume in cubic yards, tons, and bags. Features multi-zone area math, depth settling, compaction factors, and bulk vs bag cost solver.

Calculate floor, wall, and backsplash tiles in square feet or meters. Estimate boxes, layout waste, thin-set mortar, grout, costs, and visualize grid patterns.

Calculate permutations (nPr) and combinations (nCr) with or without repetition. Features step-by-step factorials, item list generator, and lottery odds.

Decode Morse code from audio files or live microphone in real time. Features automatic carrier frequency detection, adaptive noise filtering, WPM tracking, and live spectrogram.

Track intermittent fasting in real time with metabolic stages. Calculate 16:8, 18:6, OMAD eating windows, reverse target solver, and export iCal schedules.

Pick random choices, names, or raffle winners with custom weights, elimination mode, cryptographically fair CSPRNG spins, and team generator.

Generate custom WiFi QR codes instantly with real-time vector preview. Supports WPA3, WPA2, WEP, and hidden networks. Download high-res SVG, PNG, or print guest signs and table tents.

Scan QR codes and barcodes instantly online using your webcam, camera, or image file upload. Decodes WiFi, vCards, URLs, and 2FA secrets 100% locally in browser.

Add watermark to PDF files with text or image stamps. Customize opacity, angle, tile patterns, and page ranges with zero file upload privacy in your browser.

Add page numbers to PDF documents online for free. Number PDF pages with Bates stamping, custom page offsets, Roman numerals, and exact printer safe margins.

Calculate historical and future inflation, purchasing power decay, cumulative CPI rates, and cost-of-living adjustments with instant client-side precision.

Spin the customizable decision wheel for prize giveaways, raffle drawings, classroom choices, and truth-or-dare picks with CSPRNG fairness and sound effects.

Roll single or multiple polyhedral dice (D4, D6, D8, D10, D12, D20, D100) and flip coins with true cryptographic randomness, modifiers, and probability stats. 100% private in-browser gaming cockpit.

Create high-resolution QR codes for URLs, Wi-Fi networks, vCards, emails, phone numbers, and plain text with custom color palettes and SVG/PNG export.

Design beautiful, branded QR codes with custom dot shapes, corner eye styles, gradient backgrounds, and embedded center logos with high error correction.

Generate enterprise-grade linear 1D barcodes with custom quiet zones, check-digit computation, human-readable labels, and instant vector SVG and PNG downloads.

Detect musical BPM and song tempo in real time using high-precision audio beat detection or manual tap timing with zero latency.

Generate exact audible tone frequencies from 20Hz to 20,000Hz using pure sine, square, sawtooth, and triangle waves with binaural stereo controls.

Compress standard RFC 5952 IPv6 addresses (zero-compression ::), expand full 8-hextet representations, convert to integer, and generate reverse DNS PTR strings.

Calculate variable length subnet allocations, network ranges, usable IPs, subnet masks, and broadcast addresses for hierarchical network designs.

Encode and decode raw strings, binary streams, and hashes to RFC 4648 Base32 and Base32hex with customizable padding and hexadecimal views.

Generate standard RFC-compliant DNS records including SPF email policies, DMARC, DKIM, MX mail exchanges, CAA, and full BIND zone files.

Generate dynamic, customizable multi-layer fluid SVG waves and smooth Bezier curve section dividers for modern web UI with live canvas preview, gradients, and instant code export.

Create organic, smooth SVG blob shapes and dynamic fluid badges with customizable Bezier complexity, randomness seed, gradients, and instant React JSX / CSS export.

Create contact vCard 3.0/4.0 QR codes containing full name, phone number, email, company, title, address, and website for instant scanning into smartphone address books.