Math

Budget Planner Calculator

Plan your monthly budget by entering income and expense categories to see your surplus or

Health

Body Fat Calculator

Estimate your body fat percentage using the US Navy method based on waist, neck, and heigh

Everyday

Speed of Sound Calculator

Calculate the speed of sound in air at any temperature, and convert between Mach and m/s.

Physics

Gravitational Potential Energy Calculator

Calculate gravitational potential energy using mass, gravity, and height. Essential physic

Finance

Break-Even Calculator

Calculate your break-even point in units and revenue. Know exactly when your business beco

Ecology

Electricity Cost Calculator

Calculate the electricity cost of any appliance based on wattage, daily usage hours, and t

Date & Time

Business Days Calculator

Count the number of working days between two dates, excluding weekends and optional public

Business

Break-Even Point Calculator

Calculate the break-even point in units and revenue for any product or business.

Finance

One Rep Max Calculator

Estimate your one-rep max (1RM) for any lift using weight lifted and number of reps perfor

Ecology

Carbon Footprint Calculator

Estimate your personal carbon footprint from transportation, energy use, diet and lifestyl

Chemistry

Boyle's Law Calculator

Calculate pressure or volume of a gas using Boyle's Law (P₁V₁ = P₂V₂) at constant temperat

Chemistry

Ideal Gas Law Calculator

Calculate pressure, volume, temperature, or moles using the ideal gas law PV = nRT.

Physics

Kinetic Energy Calculator

Calculate the kinetic energy of a moving object using its mass and velocity. Instant physi

Finance

BMR Calculator

Calculate your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation for accurate

Math

Depreciation Calculator

Calculate annual depreciation of an asset using straight-line or declining balance methods

Finance

Protein Intake Calculator

Calculate your daily protein requirement based on body weight, activity level, and fitness

Chemistry

Stoichiometry Calculator

Calculate moles, mass, or molecules of reactants and products using stoichiometric ratios.

Math

Invoice Total Calculator

Calculate invoice subtotal, tax, discount, and final total for billing and freelance work.

Pregnancy

Heart Rate Zone Calculator

Calculate your 5 heart rate training zones based on your age or custom max heart rate.

Physics

Velocity Calculator

Enter the distance traveled and time taken to calculate the velocity of an object. Instant

Health

Body Fat Percentage Calculator

Estimate body fat percentage using the US Navy method for men and women.

Everyday

Shoe Size Converter

Convert shoe sizes between US, UK, EU, and CM sizing systems for men and women.

Everyday

Power Consumption Calculator

Calculate total household power consumption in kWh and estimate monthly electricity bill f

Date & Time

Working Days Calculator

Calculate the number of working days between two dates, excluding weekends and optional pu

Chemistry

Molarity Calculator

Calculate the molarity of a solution using moles of solute and volume in liters.

Finance

Profit Margin Calculator

Calculate gross profit margin, net profit margin, markup percentage, and selling price fro

Finance

Currency Converter

Convert between major world currencies using real-time exchange rate logic. Covers USD, EU

Pregnancy

Body Surface Area Calculator

Calculate body surface area (BSA) using height and weight with Mosteller and DuBois formul

Finance

Calorie Intake Calculator

Calculate your recommended daily calorie intake for weight loss, maintenance, or weight ga

Math

Rule of 72 Calculator

Use the Rule of 72 to estimate how long it takes to double your money at a given interest

Health

Ideal Weight Calculator

Calculate your ideal body weight based on height and gender using multiple popular formula

Math

Payback Period Calculator

Calculate the payback period of an investment — how many years to recover your initial cos

Physics

Friction Force Calculator

Calculate friction force and normal force using the coefficient of friction and object mas

Unit Converter

Temperature Converter

Convert between Celsius, Fahrenheit, Kelvin and Rankine temperature scales instantly.

Math

Mortgage Affordability Calculator

Calculate the maximum home loan you can afford based on your income, expenses, and interes

Random

Password Generator

Generate strong, secure random passwords with custom length and character options.

Physics

Ohm's Law Calculator

Calculate voltage, current, resistance or power using Ohm's Law. Solve for any electrical

Finance

Calorie Burned Calculator

Estimate calories burned during various exercises based on your weight, activity, and dura

Business

Investment Growth Calculator

Calculate how your investment grows over time using compound interest.

Math

Pension Calculator

Estimate your retirement pension corpus and monthly income based on monthly contribution,

Chemistry

Half Life Calculator

Calculate the remaining quantity of a radioactive substance after a given time using half-

Math

Currency Exchange Calculator

Convert between major world currencies using customizable exchange rates.

Math

Markup Calculator

Calculate selling price, markup percentage, and profit from cost price and desired markup

Chemistry

Molarity Dilution Calculator

Calculate the volume or concentration needed to dilute a stock solution using C1V1 = C2V2.

Finance

ROI Calculator

Calculate Return on Investment (ROI) percentage and net profit from your investment data.

Chemistry

pH Calculator

Calculate the pH of a solution using the H⁺ ion concentration. Enter the concentration in

Physics

Ohm Law Power Triangle Calculator

Calculate voltage, current, resistance, and power using any two known electrical values.

Math

Customer Lifetime Value Calculator

Calculate the Customer Lifetime Value (CLV) to understand the long-term revenue potential

Chemistry

Buffer Solution pH Calculator

Calculate the pH of a buffer solution using the Henderson-Hasselbalch equation.

Math

Accounts Receivable Turnover Calculator

Calculate accounts receivable turnover ratio and average collection period to assess busin

Math

Cash Flow Calculator

Calculate monthly net cash flow, operating cash flow, and free cash flow for a business or

Everyday

Logarithm Calculator

Calculate log base 10, natural log (ln), log base 2, and any custom base logarithm.

Math

Average Revenue Per User Calculator

Calculate Average Revenue Per User (ARPU), MRR, ARR and revenue growth metrics for SaaS an

Math

Rule of 78 Loan Calculator

Calculate early loan payoff amount and interest rebate using the Rule of 78s method.

Everyday

Number to Words Converter

Convert any number up to one trillion into words in English. Useful for cheques, invoices,

Everyday

Pythagorean Theorem Calculator

Calculate the hypotenuse or any missing side of a right triangle using the Pythagorean the

Math

Payroll Tax Calculator

Calculate gross pay, tax deductions, and net take-home pay for employees with adjustable t

Math

Profit and Loss Statement Calculator

Generate a simple profit and loss statement by entering revenue and expense line items.

Pregnancy

Creatinine Clearance Calculator

Estimate kidney function (GFR) using the Cockcroft-Gault equation from age, weight, and se

Physics

Wavelength to Energy Calculator

Calculate the energy of a photon from its wavelength or frequency using E=hf and E=hc/λ.

Math

Revenue Per Employee Calculator

Calculate revenue per employee, profit per employee, and headcount efficiency metrics for

Everyday

IP Subnet Calculator

Calculate network address, broadcast address, host range, and number of hosts for any IPv4

Math

Cost Per Unit Calculator

Calculate cost per unit, total production cost, and unit profit margin for manufacturing o

Math

Churn Rate Calculator

Calculate monthly and annual customer churn rate, retention rate, and average customer lif

Math

Margin of Safety Calculator

Calculate the margin of safety in units, revenue and percentage for any business to measur

Physics

Snell Law Calculator

Calculate the angle of refraction using Snell's Law when light passes between two media wi

Pregnancy

Calorie Intake by Age Calculator

Find the recommended daily calorie intake for children, teens and adults based on age, gen

Physics

Newton Second Law Calculator

Calculate force, mass or acceleration using Newton's Second Law (F = ma). Solve for any mi

Food

Recipe Scaling Calculator

Scale any recipe up or down by adjusting servings and get all ingredient amounts recalcula

Everyday

Coordinate Distance Calculator

Calculate the distance between two points on a 2D or 3D coordinate plane using the distanc

Date & Time

Lunar Age Calculator

Calculate your age according to the traditional lunar calendar used in Chinese, Korean and

Engineering

Pipe Flow Rate Calculator

Calculate the volumetric flow rate through a pipe using pipe diameter and fluid velocity.

Health

Body Surface Area Calculator

Calculate your Body Surface Area using Mosteller, DuBois and Haycock formulas for medical

Finance

Target Heart Rate Calculator

Calculate your target heart rate training zones using the Karvonen formula with resting he

Science

Heat Index Calculator

Calculate the feels-like temperature from air temperature and relative humidity using the

Science

Wind Chill Calculator

Calculate the feels-like temperature based on air temperature and wind speed using the off

Everyday

Tip Split Calculator

Calculate tip amount and split the total bill among any number of people with custom tip p

Math

Map Scale Calculator

Convert between map distances and real-world distances using any map scale ratio.

Science

Dew Point Calculator

Calculate the dew point temperature from air temperature and relative humidity using the M

Everyday

Electricity Bill Splitter

Split your electricity bill fairly among roommates or household members based on usage or