Free to use, no account
Free everyday tools
Small tools that do one clear job. They run in your browser, with no account or usage fee.
BTU calculator
Estimate room air-conditioner capacity in BTU/h from room size and clear adjustment assumptions. Free, unlimited and local in your browser.
Solar panel calculator
Estimate solar panel count, energy output, roof area, bill offset and simple payback. Free, unlimited and calculated in your browser.
Paver calculator
Estimate pavers, repeat modules, edging perimeter and base volume for a rectangular patio. Free and unlimited in your browser.
Image color picker
Pick exact HEX, RGB and alpha colors from an image. Build and copy a palette for free, with no account or upload.
Image pixelator
Pixelate, blur or black out selected image areas in your browser. Free, private and no upload.
Image sharpener
Sharpen image edges with adjustable strength, radius and threshold. Compare and download a local PNG or JPEG for free.
AI image upscaler
Upscale an image 2× free in your browser with no account or usage fee. Private local processing; 1 MP limit and device-dependent speed.
Wallpaper calculator
Estimate wallpaper rolls, strips and pattern-repeat waste from your wall and roll measurements. Free, unlimited browser calculator.
Mulch calculator
Estimate mulch volume, bags and optional cost from bed dimensions, depth and waste. Free and unlimited in your browser.
Pool salt calculator
Estimate pool salt to add from water volume, current salinity and your chlorinator target. Free, in-browser calculator.
Fence calculator
Estimate fence posts, gates, panels or pickets, spacing and material cost. Free browser calculator with no usage limit.
Baluster Spacing Calculator
Space balusters evenly or calculate a count from your chosen maximum gap. Free layout math in your browser.
Retaining Wall Calculator
Estimate retaining-wall block courses, base material and backfill from your own dimensions. Free browser calculator.
Battery Runtime Calculator
Estimate battery runtime from Wh or Ah, load power, discharge depth and efficiency. Free browser calculator.
Lumber Cut List Optimizer
Plan lumber cuts by stock length and saw kerf. See board layouts and offcuts with this free browser-based cut list optimizer.
Plant Spacing Calculator
Estimate garden rows and plant count with grid or staggered spacing. Free plant population calculator in your browser.
EV Charging Calculator
Estimate EV charge time, grid energy and optional charging cost from battery size, charge level and charger power. Free calculator.
Rainwater Harvesting Calculator
Estimate monthly rainwater collection, tank storage, overflow and unmet demand from your roof area and rainfall. Free calculator.
Ramp Calculator
Estimate ramp run, sloped length and landing space from a rise and chosen slope ratio. Free geometry calculator in your browser.
Heat Loss Calculator
Free, unlimited heat-loss estimate for walls, roof, windows, floor and ventilation. Runs in your browser with no account.
Heat Pump Calculator
Free, unlimited heat-pump energy and running-cost estimate from heat output, COP, hours and your electricity rate. No account.
Molarity Calculator
Calculate solution molarity, moles, volume or solute mass. Free, unlimited chemistry math in your browser; no account or upload.
Dilution Calculator
Calculate stock aliquot and diluent with C₁V₁=C₂V₂, or plan equal serial dilution steps. Free, local and no account.
Ohm’s Law Calculator
Solve voltage, current, resistance and power, or find series and parallel resistance. Free, local and no account.
Chemical Equation Balancer
Balance supported neutral chemical equations in your browser. Free, local and no account.
Gear Ratio Calculator
Calculate gear or sprocket ratios, output RPM and ideal torque. Free, local and no account.
Density Calculator
Find mass, volume or density, or estimate a mixture. Free, local and no account.
Compression Ratio Calculator
Estimate static engine compression from bore, stroke and chamber volumes. Free, local and no account.
Goal Planner
Plan a measurable goal with a deadline, milestones and local progress tracking. Free in your browser; no account or subscription.
Mind Map Maker
Make a mind map online: add branches, move ideas, undo edits, and export SVG or JSON. Free in your browser, no account.
Mood Tracker
Track daily mood check-ins in a private calendar with simple trends. Free, optional local saving, no account or upload.
Online Journal
Write dated journal entries, search privately, and export a backup. Free in your browser, no account or upload; optional local saving.
Travel Itinerary Planner
Plan trip days, bookings and activities, spot schedule clashes, then export a free calendar or print a copy. No account or upload.
Polynomial Long Division Calculator
Divide polynomials and see each long-division step, exact quotient and remainder. Free in your browser, no account.
Half-Life Calculator
Calculate half-life, elapsed time, initial amount or remaining amount with an exponential decay model. Free, in your browser.
Mortgage Points Calculator
Compare mortgage discount points, monthly payments, amortization and a payoff horizon. Free calculator, no account.
Trapezoid Calculator
Find trapezoid area, side lengths and perimeter from the parallel bases, height and offset. Free online calculator with no account.
Prayer Times Calculator
Estimate daily prayer times from your date, coordinates and chosen calculation method. Free and local in your browser.
Miter Angle Calculator
Calculate simple or compound miter-saw settings for an inside corner. Free, unlimited, local in your browser, and no account required.
Voltage Drop Calculator
Estimate resistive voltage drop for copper or aluminum wire, DC, single-phase or balanced three-phase. Free, local and no account.
Deck board calculator
Estimate deck board rows, stock boards, support lines, fasteners and material cost. Free calculator that runs in your browser.
Roofing calculator
Estimate sloped roof area, roofing squares, shingle bundles and material cost. Free calculator that runs in your browser.
Drywall calculator
Estimate drywall sheets, joint seams, screws and material cost for room walls and ceilings. Free browser calculator, no account.
Roof pitch calculator
Calculate roof pitch, slope, angle and rafter length from rise and run. Free and calculated in your browser.
Pool volume calculator
Estimate pool water volume in litres and gallons for round, oval or rectangular pools. Free and calculated in your browser.
Soil calculator
Estimate soil for raised beds and pots, including total volume and optional bag count. Free, unlimited and calculated in your browser.
Asphalt calculator
Estimate compacted asphalt volume, order tonnage and optional material cost. Free, unlimited calculator in your browser.
Stair calculator
Estimate stair riser height, tread count, total run, pitch and stringer length. Free, unlimited and calculated in your browser.
Tire size calculator
Compare tire diameter, sidewall, circumference and speed difference. Free and calculated in your browser.
Gravel calculator
Estimate gravel volume, weight and bags for a rectangle, circle or triangle. Free, unlimited and calculated in your browser.
Molar mass calculator
Calculate the molar mass of supported chemical formulas in your browser. Free, unlimited and no account needed.
Auto loan refinance calculator
Compare current and new auto-loan payments, total cost, fees and break-even time. Free browser calculator with no account.
HELOC payment calculator
Estimate HELOC interest-only and repayment payments from your balance, APR and terms. Free browser calculator; actual lender terms vary.
Secret Santa generator
Make a Secret Santa draw with exclusions and private, one-at-a-time reveals. Free, unlimited and local to your device.
Mancala (Kalah)
Play Mancala Kalah against the computer or with two people on one device. Free, unlimited and no download needed.
Dominoes game
Play double-six dominoes online against the computer or with a friend. Draw or block rules, free and no download.
Hitori puzzle
Play fresh Hitori number puzzles in your browser. Three levels, unique solutions and one-cell hints. Free, with no account.
Nurikabe puzzle
Play a free Nurikabe logic puzzle online. Connect the sea, avoid 2×2 sea blocks and build each numbered island. No account.
Slitherlink Puzzle
Free Slitherlink puzzles: draw one loop by the number clues. Use hints and undo locally.
Peg Solitaire
Play classic English peg solitaire free online. Make legal jumps, use a move hint, undo and restart on your device.
Futoshiki
Play free Futoshiki online. Fill a fresh Latin-square puzzle, follow the inequalities, check your grid, get a hint and undo moves.
Hashi Puzzle
Play a free Hashi Bridges puzzle online. Connect every island with one or two non-crossing bridges, check your route and get a hint.
Chess Opening Trainer
Practice 10 chess opening lines online for free. Play as White or Black, get move corrections and keep every move on your device.
Decibel Calculator
Convert power or amplitude ratios, add uncorrelated dB levels, or apply gain and attenuation. Free local calculator.
Color name finder
Find the closest CSS color name for any hex code. Compare perceptual matches and copy a name or value. Free, unlimited use in your browser.
Photo to sketch
Turn a photo into a pencil-style sketch in your browser. Adjust detail, compare the original and download a PNG. Free, no account.
Schema Markup Validator
Check JSON-LD syntax and Schema.org types and properties locally. Free, no account, and no markup upload.
Readability Checker
Free readability scores and writing stats. No account or upload. Local checks, a 100,000-character limit and five language-specific formulas.
Savings Goal Calculator
Find a monthly saving target or estimate when you may reach a savings goal. Free, local calculations with a 100-year cap.
Severance Pay Calculator
Estimate severance with your assumptions or a Great Britain statutory redundancy estimate. Free, no account.
Divisibility Calculator
Check divisibility, remainders and common rules for large integers. Free and no account.
Number Line Generator
Graph intervals, fractions and points on a number line. Free, no account.
Laplace Transform Calculator
Calculate common Laplace and inverse Laplace transforms locally. Free, with no account.
Vector Calculator
Calculate vector sums, dot and cross products, angles, projections and magnitudes. Free and local.
Cubic & Quartic Equation Calculator
Find approximate real roots of cubic and quartic equations. Free calculator with multiplicities and residuals.
Weight loss scenario calculator
Explore a simple weight-goal timeline from your own inputs. Free, private browser math—not a diet plan or body-weight prediction.
Random team generator
Split names into balanced random teams, keep selected people apart, and share or download results. Free, unlimited team generator in your browser.
Brick calculator
Estimate bricks, wall courses and mortar for a wall with openings. Free, unlimited and calculated in your browser.
Rafter calculator
Calculate roof rafter length, pitch and plumb-cut angle. Free, unlimited and calculated in your browser.
Carpet calculator
Plan carpet roll cuts, seams and pile direction for a room. Free, unlimited and calculated in your browser.
Aquarium volume calculator
Estimate usable aquarium water, gallons and water weight after substrate and air space. Free and calculated in your browser.
Grass seed calculator
Estimate grass seed by lawn area and your chosen rate. Plan a two-variety mix and whole bags. Free, in your browser.
Insulation R-value calculator
Add thermal resistance across insulation layers, quantities and R/RSI units. Free calculation in your browser.
Wall framing calculator
Estimate wall studs and plate lengths from spacing and opening positions. Free planning math in your browser.
Electricity Cost Calculator
Estimate appliance electricity use and bill cost from power, usage days and your kWh rate. Free and private in your browser.
Compost Calculator
Estimate a compost mix C:N ratio and moisture from your material data. Free, private and calculated in your browser.
Pond Volume Calculator
Estimate pond water volume and liner sheet size for rectangular, round or oval ponds. Free and private in your browser.
Fertilizer Calculator
Calculate labeled N-P-K nutrient amounts or product mass from your own area and rate. Free and private in your browser.
Complex Number Calculator
Add, multiply, divide, convert and find complex roots. Free browser calculator with polar and rectangular forms.
Kinetic Energy Calculator
Calculate kinetic and potential energy or solve speed from energy. Free, local and no account.
Resistor Color Code Calculator
Decode 4, 5 or 6 resistor bands, or encode an ohm value. Free, local and no account.
Acceleration Calculator
Solve acceleration, time, final velocity or displacement with constant acceleration. Free and no account.
Force Calculator
Calculate force, mass, acceleration or net force with a free Newton’s second law calculator. No account; calculations stay in your browser.
Horsepower Calculator
Calculate engine horsepower from torque and RPM, or solve torque and RPM from power. Free, no usage limits; calculations stay in your browser.
RTF Converter
Convert RTF to text, download it or print to PDF. Free and local; files up to 5 MiB stay on your device.
CSV to PDF Converter
Preview and print CSV tables to PDF for free. Local processing, no sign-up; files up to 5 MiB stay on your device.
Round Robin Tournament Generator
Create a free round-robin schedule with byes, optional return legs, live standings and CSV or print export. Runs in your browser.
Work Order Generator
Create and print a free work order template. Track job status, checklist, materials and labor hours in your browser; no pricing or upload.