Calculate. Convert. Generate. Solve.
One fast utility hub for everyday math, unit conversions, money, real estate, everyday life, construction, education, dates, text, and secure generators. Start with the smart box or jump straight into a tool.
Choose a category
Like a serious utility directory: important tool families stay visible instead of being buried inside a giant menu.
Calculators
Everyday math, percentages, ratios, number checks, and equation solvers.
Converters
Fast unit conversions for length, mass, temperature, volume, data, and time.
Money
Loan, interest, discount, margin, profit, commission, tip, and bill calculators.
Date & Time
Calculate date differences, add days, ages, birthdays, and Unix timestamps.
Text Tools
Count, clean, transform, sort, reverse, and extract useful information from text.
Generators
Create secure passwords, UUIDs, and other useful generated values locally in your browser.
Real Estate
Mortgage, affordability, rental investment, property pricing, land conversion, checklists, and document planning tools.
Everyday
Practical travel, fuel, electricity, screen, recipe, pace, and daily-life calculators.
Construction
Estimate paint, tile, concrete, flooring, wallpaper, roofing, bricks, drywall, and fencing.
Education
Grades, GPA, study time, attendance, reading speed, typing speed, and score calculators.
Start with these
Percentage Calculator
Calculate a percentage of any number and see the substituted calculation.
Open tool → Real EstateMortgage Calculator
Estimate monthly mortgage principal and interest plus optional property tax, insurance, and monthly service fees.
Open tool → EverydayFuel Cost Calculator
Estimate liters used and trip fuel cost from distance, fuel economy, and fuel price.
Open tool → ConstructionPaint Calculator
Estimate liters of paint needed from area, coverage, coats, and waste allowance.
Open tool → EducationGrade Calculator
Calculate a percentage grade from points earned and points possible.
Open tool → ConvertersKilograms to Pounds
Convert kilograms to pounds for weight and mass comparisons.
Open tool → Date TimeDays Between Dates
Calculate the number of calendar days between two dates.
Open tool → Text ToolsWord Counter
Count words in text locally in your browser.
Open tool → MoneyROI Calculator
Calculate return on investment as a percentage of the original cost.
Open tool → Real EstateProperty Document Organizer
Create and save a browser-local checklist of property documents, their status, and notes without uploading the documents themselves.
Open tool →Calculators tools
Percentage Calculator
Calculate a percentage of any number and see the substituted calculation.
Open tool → CalculatorsPercentage Increase Calculator
Find how much a value increased as a percentage of the original.
Open tool → CalculatorsPercentage Decrease Calculator
Calculate the percentage decrease between an original and a lower value.
Open tool → CalculatorsPercentage Difference Calculator
Compare two values using percentage difference based on their average.
Open tool → CalculatorsAverage Calculator
Calculate the arithmetic mean of a list of numbers.
Open tool → CalculatorsRatio Calculator
Simplify a two-part ratio to its lowest whole-number terms.
Open tool →Converters tools
Centimeters to Inches
Convert centimeters to inches with a precise metric-to-imperial conversion.
Open tool → ConvertersInches to Centimeters
Convert inches to centimeters using the exact international inch definition.
Open tool → ConvertersFeet to Meters
Convert feet to meters for height, distance, and construction measurements.
Open tool → ConvertersMeters to Feet
Convert meters to feet quickly with a precise conversion factor.
Open tool → ConvertersMiles to Kilometers
Convert statute miles to kilometers for travel and distance measurements.
Open tool → ConvertersKilometers to Miles
Convert kilometers to statute miles instantly.
Open tool →Money tools
Loan Calculator
Estimate a fixed monthly loan payment, total paid, and total interest.
Open tool → MoneyCompound Interest Calculator
Calculate compound growth using a selected compounding frequency.
Open tool → MoneySimple Interest Calculator
Calculate simple interest and the final amount without compounding.
Open tool → MoneyDiscount Calculator
Calculate discount savings and the final sale price.
Open tool → MoneyMarkup Calculator
Calculate markup percentage from cost and selling price.
Open tool → MoneyMargin Calculator
Calculate gross margin percentage from cost and selling price.
Open tool →Date & Time tools
Days Between Dates
Calculate the number of calendar days between two dates.
Open tool → Date TimeAdd Days to Date
Add or subtract a number of calendar days from a date.
Open tool → Date TimeAge Calculator
Calculate age in completed years, months, and days between two dates.
Open tool → Date TimeBirthday Countdown
Find how many days remain until the next birthday.
Open tool → Date TimeUnix Timestamp Converter
Convert Unix seconds since 1970-01-01 UTC into a readable date and time.
Open tool → Date TimeSubtract Days from Date
Subtract a whole number of calendar days from a date.
Open tool →Text Tools tools
Word Counter
Count words in text locally in your browser.
Open tool → Text ToolsCharacter Counter
Count characters with and without spaces.
Open tool → Text ToolsReading Time Calculator
Estimate reading time from word count and reading speed.
Open tool → Text ToolsSpeaking Time Calculator
Estimate speaking time for a script, speech, or presentation.
Open tool → Text ToolsCase Converter
Convert text to uppercase, lowercase, title case, or sentence case locally.
Open tool → Text ToolsRemove Duplicate Lines
Remove repeated lines while preserving the first occurrence.
Open tool →Real Estate tools
Mortgage Calculator
Estimate monthly mortgage principal and interest plus optional property tax, insurance, and monthly service fees.
Open tool → Real EstateMortgage Overpayment Calculator
Estimate how additional monthly mortgage payments can shorten payoff time and reduce interest.
Open tool → Real EstateHome Affordability Calculator
Estimate a property budget from income, debts, a debt-to-income limit, financing assumptions, and available down payment.
Open tool → Real EstateDown Payment Calculator
Calculate the cash down payment and resulting mortgage amount from a property price and percentage.
Open tool → Real EstateRent vs Buy Calculator
Compare simplified cumulative housing cost of renting versus buying over a chosen holding period.
Open tool → Real EstateRental Yield Calculator
Calculate gross and net rental yield from property value, rent, and annual operating costs.
Open tool →Everyday tools
Fuel Cost Calculator
Estimate liters used and trip fuel cost from distance, fuel economy, and fuel price.
Open tool → EverydayFuel Economy Calculator
Calculate fuel economy in liters per 100 km and approximate km per liter.
Open tool → EverydayTrip Cost Calculator
Add common road-trip costs and optionally split the total between travelers.
Open tool → EverydayElectricity Cost Calculator
Estimate energy use and electricity cost from wattage, usage time, and kWh price.
Open tool → EverydayDownload Time Calculator
Estimate ideal download time from file size and connection speed.
Open tool → EverydayData Usage Calculator
Estimate total data usage from hours per day, MB per hour, and number of days.
Open tool →Construction tools
Paint Calculator
Estimate liters of paint needed from area, coverage, coats, and waste allowance.
Open tool → ConstructionTile Calculator
Estimate the number of rectangular tiles needed for an area including waste.
Open tool → ConstructionConcrete Calculator
Estimate concrete volume in cubic meters for a rectangular slab.
Open tool → ConstructionFlooring Calculator
Estimate flooring area to purchase from room dimensions plus waste allowance.
Open tool → ConstructionWallpaper Calculator
Estimate wallpaper rolls from total wall width, wall height, and roll dimensions.
Open tool → ConstructionRoof Area Calculator
Estimate simple gable-roof surface area from footprint dimensions and roof pitch.
Open tool →Education tools
Grade Calculator
Calculate a percentage grade from points earned and points possible.
Open tool → EducationGPA Calculator
Calculate a credit-weighted GPA from numeric grade points and matching course credits.
Open tool → EducationWeighted Grade Calculator
Calculate a weighted course score from percentage scores and their weights.
Open tool → EducationRequired Final Grade Calculator
Calculate the score needed on the remaining course weight to reach a target grade.
Open tool → EducationMarks Percentage Calculator
Calculate marks percentage from obtained marks and total marks.
Open tool → EducationStudy Time Planner
Estimate total study time and average daily study time from topics, time per topic, and days available.
Open tool →Reference guides
How Percentages Work
Formulas for percentage-of, change, increase, decrease, and difference.
Read guide →GuideRental Property Metrics
Understand yield, cap rate, cash flow, cash-on-cash return, DSCR, and GRM.
Read guide →GuideConstruction Estimating Basics
Plan area, volume, coverage, product dimensions, and waste allowances.
Read guide →Need something specific?
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