All Online Tools & Calculators
Browse every SmartCheu tool from one crawlable directory. Tools are grouped by topic so you can move from a broad category to the exact calculator, converter or text utility you need.
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Text Tools
Text, formatting and developer-friendly utilities for cleaning, transforming, encoding and validating text data.
Writing & cleanup
Count, clean, organize and reshape everyday text.
Word Counter
Count words, characters, sentences and paragraphs instantly.
Open tool →Character Counter
Count characters with and without spaces.
Open tool →Reading Time Calculator
Estimate reading time from word count and reading speed.
Open tool →Case Converter
Convert text to uppercase, lowercase, title case or sentence case.
Open tool →Remove Extra Spaces
Clean repeated spaces, tabs and unnecessary blank spacing from text.
Open tool →Remove Duplicate Lines
Remove repeated lines while keeping the first occurrence.
Open tool →Text Sorter
Sort lines alphabetically in ascending or descending order.
Open tool →Text Reverser
Reverse characters, words or lines in text.
Open tool →Find and Replace Tool
Find plain text and replace every matching occurrence in a larger block of text.
Open tool →Slug Generator
Turn a title or phrase into a clean lowercase URL slug with hyphens.
Open tool →Developer & encoding
Format structured data and convert text for URLs, HTML and data workflows.
URL Encoder & Decoder
Encode text for URL components or decode percent-encoded URL text.
Open tool →Base64 Encoder & Decoder
Encode UTF-8 text to Base64 or decode Base64 back to text.
Open tool →HTML Entity Encoder & Decoder
Encode common HTML-sensitive characters or decode HTML entities to readable text.
Open tool →JSON Formatter & Validator
Validate JSON and format valid JSON with readable indentation.
Open tool →CSV to JSON Converter
Convert simple delimited tabular text into a JSON array of objects.
Open tool →Text to Binary Converter
Convert UTF-8 text to 8-bit binary bytes or decode binary bytes back to text.
Open tool →Math Tools
Everyday and study-focused math calculators for arithmetic, algebra, geometry, combinatorics and number operations.
Percentages & everyday math
Solve common percentage, ratio and everyday number questions.
Percentage Calculator
Find what percentage one number is of another.
Open tool →Percentage Change Calculator
Calculate percentage increase or decrease between two values.
Open tool →Average Calculator
Find the arithmetic mean of a list of numbers.
Open tool →Ratio Simplifier
Simplify a two-number ratio to its lowest whole-number form.
Open tool →Fraction to Percent Calculator
Convert a fraction into a percentage.
Open tool →Square Root Calculator
Calculate the principal square root of any non-negative number.
Open tool →Absolute Value Calculator
Find the non-negative absolute value of a number.
Open tool →Modulo Calculator
Calculate the non-negative remainder after division.
Open tool →Random Number Generator
Generate one or more random whole numbers inside a minimum and maximum range.
Open tool →Number theory & powers
Work with factors, primes, factorials, exponents, logarithms and scientific notation.
GCD & LCM Calculator
Find the greatest common divisor (GCD) and least common multiple (LCM) of two positive whole numbers.
Open tool →Prime Number Checker
Check whether a positive whole number is prime and see the basic divisibility result.
Open tool →Factorial Calculator
Calculate n! for a non-negative whole number.
Open tool →Exponent Calculator
Raise a base number to a chosen exponent.
Open tool →Logarithm Calculator
Calculate a logarithm using any valid positive base except 1.
Open tool →Scientific Notation Converter
Convert a finite number into scientific notation.
Open tool →Algebra, geometry & combinatorics
Solve equations, geometry measurements and counting problems.
Quadratic Equation Solver
Solve ax² + bx + c = 0 for real or complex roots.
Open tool →Pythagorean Theorem Calculator
Find the hypotenuse of a right triangle from its two perpendicular sides.
Open tool →Circle Calculator
Calculate circle diameter, circumference and area from radius.
Open tool →Triangle Area Calculator
Calculate triangle area from base and perpendicular height.
Open tool →Rectangle Calculator
Calculate rectangle area, perimeter and diagonal from length and width.
Open tool →Permutation & Combination Calculator
Calculate nPr and nCr for non-negative whole numbers.
Open tool →Finance & Shopping
Shopping and money estimation tools for prices, tax, margins, growth, commissions, savings and simple payment calculations.
Shopping, pricing & taxes
Compare prices, discounts, taxes, commissions and day-to-day purchase costs.
Discount Calculator
Calculate sale price and amount saved.
Open tool →Tip Calculator
Calculate a tip, final bill and per-person split.
Open tool →Sales Tax Calculator
Add a sales-tax percentage to a price.
Open tool →Unit Price Calculator
Calculate the price per item, kilogram, liter or other unit from a total price and quantity.
Open tool →Markup Calculator
Calculate selling price and profit from cost and markup percentage.
Open tool →VAT Calculator
Add VAT to a net amount or remove VAT from a VAT-inclusive total.
Open tool →Commission Calculator
Calculate commission amount from sales value and commission rate.
Open tool →Price per Square Foot Calculator
Calculate price per square foot or square unit from total price and area.
Open tool →Fuel Cost Calculator
Estimate trip fuel use and fuel cost from distance, efficiency and fuel price.
Open tool →Interest, debt & savings
Estimate loan payments, interest, savings targets and debt ratios.
Loan EMI Calculator
Estimate a fixed monthly payment for a standard amortizing loan.
Open tool →Simple Interest Calculator
Calculate simple interest and final amount.
Open tool →Compound Interest Calculator
Estimate compound growth from a starting amount, annual rate, time period and compounding frequency.
Open tool →Savings Goal Calculator
Estimate the monthly amount needed to reach a simple savings target without investment growth.
Open tool →Debt-to-Income Ratio Calculator
Calculate a simple monthly debt-to-gross-income percentage.
Open tool →Salary to Hourly Calculator
Convert annual salary to an estimated hourly rate using work hours and weeks per year.
Open tool →Business & investment metrics
Measure profitability, break-even points and investment growth.
Profit Margin Calculator
Calculate gross profit, profit margin and markup from cost and selling price.
Open tool →Break-Even Calculator
Estimate break-even units from fixed cost, unit price and variable cost per unit.
Open tool →ROI Calculator
Calculate simple return on investment from initial cost and final value.
Open tool →CAGR Calculator
Calculate compound annual growth rate between a beginning value and ending value.
Open tool →Converters
Unit converters for physical measurements, engineering values, cooking, fuel economy and digital transfer rates.
Everyday measurements
Convert common length, weight, size, temperature, speed, cooking and time units.
Length Converter
Convert meters, kilometers, centimeters, millimeters, inches, feet, yards and miles.
Open tool →Weight Converter
Convert kilograms, grams, pounds and ounces.
Open tool →Temperature Converter
Convert Celsius, Fahrenheit and Kelvin.
Open tool →Speed Converter
Convert km/h, mph, m/s and knots.
Open tool →Area Converter
Convert square meters, square feet, acres, hectares and other common area units.
Open tool →Volume Converter
Convert liters, milliliters, cubic units and common US liquid volume units.
Open tool →Cooking Measurement Converter
Convert common liquid cooking volumes including mL, liters, teaspoons, tablespoons, cups and US fluid units.
Open tool →Time Unit Converter
Convert between seconds, minutes, hours, days, weeks and common-year equivalents.
Open tool →Engineering & science
Convert scientific and engineering quantities with consistent unit relationships.
Pressure Converter
Convert pascals, kilopascals, bar, PSI, atmospheres and millimeters of mercury.
Open tool →Energy Converter
Convert joules, kilojoules, calories, kilocalories, watt-hours and kilowatt-hours.
Open tool →Power Converter
Convert watts, kilowatts, megawatts, horsepower and BTU per hour.
Open tool →Angle Converter
Convert angles between degrees, radians, gradians and turns.
Open tool →Frequency Converter
Convert frequency between hertz, kilohertz, megahertz, gigahertz and revolutions per minute.
Open tool →Force Converter
Convert force between newtons, kilonewtons, pound-force, kilogram-force and dynes.
Open tool →Torque Converter
Convert torque between newton-meters, kilonewton-meters, pound-feet and pound-inches.
Open tool →Acceleration Converter
Convert acceleration between m/s², ft/s², standard gravity and Gal.
Open tool →Density Converter
Convert density between kg/m³, g/cm³, lb/ft³ and lb/in³.
Open tool →Illuminance Converter
Convert illuminance between lux, kilolux and foot-candles.
Open tool →Data, fuel & flow
Convert digital data rates, fuel economy and mass or volumetric flow.
Data Storage Converter
Convert bytes, KB, MB, GB and TB using decimal storage units.
Open tool →Data Transfer Rate Converter
Convert network and file-transfer rates between bits per second and bytes per second units.
Open tool →Fuel Economy Converter
Convert between L/100 km, km/L, US MPG and UK MPG.
Open tool →Mass Flow Rate Converter
Convert mass flow rates between kg/s, kg/min, kg/h, lb/s, lb/min and lb/h.
Open tool →Volumetric Flow Rate Converter
Convert liquid or gas volume flow between L/s, L/min, m³/h, US GPM and CFM.
Open tool →Date & Time
Date and time calculators for ages, date gaps, business days, week numbers, timestamps and fixed UTC-offset conversions.
Date planning & counting
Count dates, business days, age, week numbers and days between milestones.
Age Calculator
Calculate age in completed years, months and days between two dates.
Open tool →Date Difference Calculator
Find the number of calendar days between two dates.
Open tool →Days Until Date Calculator
Calculate how many calendar days remain until a selected date, or how many days have passed since it.
Open tool →Business Days Calculator
Count Monday-through-Friday calendar days between two dates, including both endpoints.
Open tool →Add or Subtract Days Calculator
Add a positive or negative number of calendar days to a selected date.
Open tool →ISO Week Number Calculator
Find the ISO-8601 week number and week-year for a calendar date.
Open tool →Time & timestamps
Work with elapsed time, Unix timestamps and UTC offsets.
Time Duration Calculator
Find elapsed hours and minutes between two clock times.
Open tool →Unix Timestamp Converter
Convert a local date/time to a Unix timestamp or convert a Unix timestamp to a readable UTC date/time.
Open tool →Time Zone Offset Calculator
Convert a date and clock time between two numeric UTC offsets.
Open tool →Health Tools
General health screening calculators with clear limitations and non-diagnostic guidance.
Body measurement tools
Use simple body-measurement screening calculators with clear limitations.
How this tools directory helps
This page is an HTML navigation hub as well as a visitor directory. Every published tool above uses a normal crawlable link, while each category also has its own focused hub page. Individual tool pages link back to their category and to closely related tools, creating clear paths through SmartCheu without changing existing tool URLs.