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Calculator hubMath, school, statistics, geometry, number, and everyday calculation tools.Finance calculatorsMortgage, loan, salary, tax, investment, and interest estimate tools.Health and fitness estimatesBMI, calorie, body fat, pregnancy, heart-rate, and fitness calculators.Home project calculatorsConcrete, paint, flooring, roofing, rebar, wallpaper, and material planning tools.Browser AI toolsPrivate browser-side AI helpers for OCR, text, tone, keywords, and reading level.Free calculator resourcesA curated resource page for students, teachers, writers, and community links.

Things people usually need fast

Shortcuts for the stuff that comes up a lot: discounts, loans, wallpaper rolls, OCR, power conversions, and quick guides.

Convert watts to ampsUse watts, voltage, and phase to estimate current, then read the guide before using the number near real electrical work.Watts to amps guideSee why the same watts can mean different amps when voltage or phase changes.Plan wallpaper rollsEstimate roll counts, pattern repeat, and waste percent so a room project does not come up short.Wallpaper calculator guideLearn what waste percent means and why pattern repeat can change the final roll estimate.Turn an image into textRun OCR in the browser, check image quality, and understand where text recognition can make mistakes.OCR tool guideUse better photos, cleaner contrast, and realistic expectations for browser text recognition.Search the full libraryFind calculators, converters, AI tools, and plain-English guides from one searchable starting point.Read the guide libraryOpen tool walkthroughs that explain inputs, examples, mistakes, and result limits.

Recently added tools

New tools for BMI checks, power conversions, golf handicaps, economics, and everyday finance math.

Underweight BMI CalculatorCheck adult BMI against the underweight screening threshold with careful safety notes.

Overweight BMI CalculatorCheck adult BMI against overweight and obesity screening categories.

Nutrition Points CalculatorCreate a transparent food-label score from calories, saturated fat, added sugar, sodium, fiber, and protein.

Love CalculatorTry a playful love percentage with two names or with names and birthdays.

GDP CalculatorEstimate gross domestic product with C + I + G + net exports, then check GDP per person.

Horsepower CalculatorConvert mechanical horsepower, metric horsepower, watts, and kilowatts.

Engine Horsepower CalculatorCalculate horsepower, torque, or RPM from two known values, or estimate engine and wheel horsepower.

Golf Handicap CalculatorEstimate score differential, course handicap, and playing handicap from the numbers on your scorecard.

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Quick calculators people open a lot

Start with a common calculator, or use search when you need something more specific.

Mortgage CalculatorEstimate monthly principal, interest, taxes, insurance, PMI, and HOA costs.

Loan CalculatorSolve for monthly payment, loan amount, interest rate, or payoff term for a fixed-rate loan.

Age CalculatorCalculate exact calendar age in years, months, days, and total days.

Date CalculatorAdd or subtract days from a date, or count full days between two dates.

Percentage CalculatorFind percent-of answers, percent change, discounts, and original values with reverse percentages.

Fraction CalculatorCalculate, simplify, compare, and convert fractions, mixed numbers, whole numbers, and decimals with steps.

Scientific CalculatorA free scientific calculator for trig, inverse trig, logs, roots, powers, constants, and DEG/RAD mode.

Random Number GeneratorGenerate random numbers in a custom range, with unique, sorted, and copied results.

Password GeneratorGenerate strong random passwords with length, character sets, and ambiguity controls.

Conversion CalculatorConvert length, mass, volume, and temperature units with clear formula steps.

Statistics CalculatorCalculate count, sum, mean, median, mode, range, quartiles, IQR, variance, and sample or population standard deviation.

Triangle CalculatorCheck three triangle sides, find a possible third-side range, or calculate SSS area, perimeter, angles, and type.

BMI CalculatorEstimate adult body mass index and healthy BMI weight range.

Calorie CalculatorEstimate daily calories from BMR, activity level, and goal.

Compound Interest CalculatorEstimate compound growth with deposits, rate, time, and compounding frequency.

Sales Tax CalculatorFind sales tax and final total from a subtotal and local rate.

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Calculators

Everyday math, finance, school, and measurement calculators.

Converters

Unit, file, color, text, and measurement conversion tools.

Text Tools

Word counts, case changes, cleanups, and formatting helpers.

Date & Time

Date differences, time zones, countdowns, and scheduling helpers.

Finance

Savings, budget, payment, interest, and comparison tools.

Health & Fitness

Simple wellness calculators with clear educational disclaimers.

Home & Projects

Material, room, yard, and building-project estimators for rough planning.

Developer Tools

Encoding, formatting, JSON, URL, and productivity utilities.

Image Tools

Simple browser-based image helpers for daily creative tasks.

AI Tools

Browser-only AI helpers for text, images, OCR, summaries, and writing checks.

School & Study

Student-friendly tools for notes, math, timing, and planning.

Everyday Tools

Quick utilities for ordinary tasks, decisions, and checklists.