All tools
Browse every calculator, converter, chart maker, template, and business tool.
Math & Calculators
Calculators for percentages, fractions, probability, geometry, and everyday math.
8 tools →
Date & Time
Compare dates, convert time zones, and calculate durations or work hours.
6 tools →
Finance
Calculate interest, investment returns, loans, and household spending.
4 tools →
Units & Measurement
Convert length, weight, area, volume, temperature, speed, and data sizes.
7 tools →
Text & Data
Count, clean, validate, convert, and format text or structured data.
8 tools →
Chart Makers
Turn simple data into bar, line, or pie charts and export the result.
3 tools →
Study & Formulas
Interactive math and physics formulas for students and quick checks.
6 tools →
Work Templates
Generate practical drafts for resumes, proposals, specifications, and meetings.
5 tools →
Restaurant & Shop
Calculate margin, promotions, delivery fees, staffing, and startup costs.
8 tools →
Scientific Calculator
Use a full keypad for arithmetic, powers, roots, trigonometry, and logarithms.
Percentage Calculator
Calculate a percentage, ratio, or value after a percentage change.
Percentage Change Calculator
Find the percentage increase or decrease between two values.
Average Calculator
Calculate average, sum, count, minimum, and maximum.
Ratio Calculator
Simplify ratios or solve a missing value in a proportion.
Fraction Calculator
Add, subtract, multiply, or divide fractions and simplify the result.
Probability Calculator
Calculate single-event, combined, and complementary probabilities.
Geometry Calculator
Calculate area, perimeter, surface area, or volume for common shapes.
Time Zone Converter and World Clock
Convert times between cities, compare world time zones, and plan meetings.
Date Difference Calculator
Find the number of days, weeks, months, and years between dates.
Add or Subtract Days
Add or subtract days from a date and show the resulting weekday.
Age Calculator
Calculate exact age, total days, and time until the next birthday.
Hours to Minutes, Minutes to Seconds Converter
Convert hours to minutes, minutes to seconds, days, weeks, and milliseconds.
Work Hours Calculator
Calculate daily and weekly work hours after breaks, with optional pay.
Compound Interest Calculator
Project investment growth with interest, time, and monthly contributions.
Stock Profit & Loss Calculator
Calculate gain or loss from capital, price movement, and trading fees.
Loan Payoff Calculator
Estimate monthly payoff time, total interest, and the effect of extra payments.
Living Expense Calculator
Total monthly expenses, compare them with income, and see the remaining balance.
cm to inches, meters to feet Converter
Convert cm to inches, inches to cm, meters to feet, kilometers to miles, and more.
kg to lb, lb to kg Converter
Convert kilograms to pounds, pounds to kilograms, grams to ounces, and more.
Square Meter, Square Foot, Acre, Ping Converter
Convert square meters, square feet, acres, hectares, ping, and other area units.
mL to L, Cups to mL, Gallons Converter
Convert milliliters, liters, cups, tablespoons, teaspoons, gallons, and cubic units.
Celsius to Fahrenheit, Fahrenheit to Celsius Converter
Convert Celsius to Fahrenheit, Fahrenheit to Celsius, and Kelvin values.
km/h to mph, mph to km/h, m/s Converter
Convert km/h to mph, mph to km/h, m/s, knots, and ft/s.
MB to GB, KB to MB Data Size Converter
Convert KB, MB, GB, TB, KiB, MiB, GiB, bytes, and bits.
Word & Character Counter
Count words, characters, lines, paragraphs, and reading time.
Uppercase, Lowercase, Title Case Converter
Convert text to uppercase, lowercase, title case, or sentence case.
Remove Duplicate Lines
Remove repeated lines while preserving the original order.
Sort Lines
Sort lines alphabetically, numerically, by length, or randomly.
JSON Formatter and Validator Online
Format JSON, validate JSON syntax, or minify JSON online.
CSV to JSON, JSON to CSV Converter
Convert CSV to JSON or JSON to CSV with simple format validation.
Hex to Decimal, Decimal to Hex Converter
Convert hex to decimal, decimal to hex, binary to decimal, and octal values.
Base64 Encode and Decode Online
Encode text to Base64 or decode Base64 back to readable text online.
Bar Chart Maker
Paste labels and values, preview a bar chart, and export it.
Line Chart Maker
Create and export a line chart from simple tabular data.
Pie Chart Maker
Create and export a pie or doughnut chart from category values.
Speed, Distance & Time
Enter any two values to solve the third using v = d ÷ t.
Density, Mass & Volume
Solve density, mass, or volume using ρ = m ÷ V.
Ohm’s Law Calculator
Solve voltage, current, or resistance in a simple circuit.
Force Calculator
Solve force, mass, or acceleration using F = m × a.
Math Symbols Reference
Search and copy common arithmetic, algebra, geometry, calculus, and logic symbols.
Kinetic Energy Calculator
Calculate kinetic energy, mass, or velocity using E = ½mv².
Resume Autobiography Template
Fill in key points and generate a concise professional autobiography draft.
Project Proposal Template
Generate a structured proposal with goals, scope, schedule, budget, and risks.
Product Specification Template
Create a product specification with users, requirements, and acceptance criteria.
Budget Plan Template
Generate a simple budget plan with income, expenses, assumptions, and approval notes.
Meeting Minutes Template
Generate clean meeting minutes with decisions and action items.
Restaurant Margin Calculator
Calculate item gross profit, margin, and variable cost ratio.
Add-on Promotion Calculator
Estimate extra profit from an add-on offer and its attachment rate.
Discount Profit Calculator
See the discounted price, unit profit, margin, and total profit.
Menu Price Increase Calculator
Compare profit and margin before and after a menu price increase.
Food Delivery Fee Calculator
Calculate net receipts and profit after commission and payment fees.
Break-even Calculator
Calculate contribution margin, break-even units, and required sales.
Startup Cost Calculator
Total setup costs, deposits, inventory, and working capital reserves.
Labor Cost Ratio Calculator
Calculate total labor cost and its percentage of revenue.