Categories · 28 tools

Calculators

Quick calculators for money, health, dates and math, with results as you type.

Money

Invoice Generator

Make a professional invoice: lines, tax, discount, shipping and totals worked out to the cent, saved as a PDF.

Loan (EMI) Calculator

Calculate the monthly installment, total interest and total payment of a loan.

Interest Calculator

Calculate simple interest and the total amount on a principal over a number of years.

Profit Calculator

Calculate Your Profit in Future

Sales Tax / GST Calculator

Quickly calculate the tax amount and the total price including tax from a net price.

Tip Calculator

Quickly calculate tips and split bills among friends with real-time per-person breakdowns.

Percentage Calculator

Calculate X% of Y, what percent one number is of another, or percent change.

Currency Converter

Convert an amount between ten major currencies using current reference exchange rates.

Health & life

BMI Calculator

Calculate body mass index (BMI) from weight in kilograms and height in centimeters.

Calorie (BMR) Calculator

Estimate your daily calorie needs based on your Basal Metabolic Rate (BMR) and activity level using the Mifflin-St Jeor equation.

Macronutrient Calculator

Break down your daily calorie goal into Protein, Carbohydrates, and Fats based on your fitness goals.

Age Calculator

Calculate exact age in years, months and days, plus total months and days.

Between Dates Calculator

Calculate Days, Weeks, Months etc between two dates.

Time Duration Calculator

Calculate the time difference between two clock times, including spans that cross midnight, with hours, minutes and seconds.

GPA Calculator

Easy To Use GPA Calculator Tool

Pet Real Age Calculator

Estimate your dog's or cat's age in human years with the common rule of thumb.

Math & science

Graphing Calculator

Plot functions like sin(x), x^2 or 1/x: drag to move, scroll to zoom, read values, and download a PNG.

Fraction Calculator

Add, subtract, multiply, divide and simplify fractions and mixed numbers with exact answers.

Roman Numeral Converter

Convert numbers to Roman numerals and Roman numerals to numbers, from 1 to 3999.

Decimal to Fraction Calculator

Convert a decimal number into an exact fraction or its closest simple fraction.

Standard Deviation Calculator

Calculate the sample and population standard deviation, variance, and mean for a set of numbers.

Binary Operations Calculator

Perform arithmetic operations on binary numbers (Add, Subtract, Multiply, Divide) with instant conversion to decimal and hex.

Scientific Calculator

Scientific calculator with trig (degrees or radians), logs, roots, powers, factorial, pi and e. Keypad and keyboard input.

Ohm's Law Calculator

Calculate Voltage, Current, Resistance, and Power instantly by entering any two known values.

Aspect Ratio Calculator

Calculate the aspect ratio of any image or video, or scale dimensions while maintaining a fixed ratio.

Electricity Cost Calculator

Calculate the estimated cost of running any household appliance based on its wattage and your local energy rates.

Password Entropy Calculator

Measure the mathematical strength of your passwords using bit entropy to determine how resistant they are to brute-force attacks.

Random Number Generator

Generate Random Numbers in Range

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