Practical Tools for Everyday Life
BMI, loans, currency, unit conversion — 50+ free calculators that work right in your browser. No downloads, no sign-ups.
All Calculators
239 tools
BMI Calculator
Calculate your Body Mass Index by height, weight, and gender.
Calorie Calculator
Calculate your daily calorie needs (TDEE) and basal metabolic rate (BMR).
Body Fat Calculator
Estimate your body fat percentage using waist, neck, and hip measurements.
Ideal Weight Calculator
Calculate the ideal weight range based on height and gender.
Daily Water Intake Calculator
Calculate your recommended daily water intake based on weight and activity level.
Pregnancy Calculator
Calculate pregnancy weeks and due date from the last menstrual period.
Ovulation Calculator
Predict ovulation date and fertile window based on menstrual cycle.
Loan Comparison Calculator
Compare multiple loan options side by side with rates and terms.
Loan Calculator
Calculate monthly payments and total interest for loans.
Compound Interest Calculator
Calculate compound interest growth with principal, rate, and time.
Currency Converter
Convert between major currencies with up-to-date exchange rates.
Tax Calculator
Calculate VAT, income tax, and other taxes easily.
Investment Goal Calculator
Calculate monthly investment needed to reach your goal with compound returns.
Savings Goal Calculator
Enter your savings goal and timeline to find the monthly amount needed.
Tip Splitter
Enter each person's amounts and split the bill with tip fairly.
Tip Calculator
Calculate tip amount and split the bill per person.
ROI Calculator
Calculate Return on Investment (ROI) from investment and profit.
Percentage Calculator
Easily calculate percentages, percentage change, and ratios.
Fraction Calculator
Add, subtract, multiply, and divide fractions with simplification.
Scientific Calculator
Supports advanced math: trigonometry, logarithms, exponents, and more.
GCD & LCM Calculator
Calculate the Greatest Common Divisor and Least Common Multiple.
Prime Factorization Calculator
Factorize natural numbers into prime factors and check primality.
Length Converter
Convert between cm, m, km, inches, feet, miles, and more.
Weight Converter
Convert between kg, g, lb (pounds), oz (ounces), and more.
Temperature Converter
Convert between Celsius (°C), Fahrenheit (°F), and Kelvin (K).
Area Converter
Convert between m², km², acres, hectares, and more.
Speed Converter
Convert between km/h, m/s, mph, knots, and more.
Data Storage Converter
Convert between Byte, KB, MB, GB, TB, PB, and more.
Age Calculator
Calculate your exact age, Korean age, and zodiac sign from birthdate.
Age in Days Calculator
Calculate your exact age in days, weeks, months, and years from your birthdate.
Date Difference Calculator
Calculate the number of days, weeks, and months between two dates.
Time Zone Converter
Convert time between major cities and time zones worldwide.
Sleep Calculator
Calculate the best wake-up or bedtime based on sleep cycles.
Fuel Cost Calculator
Calculate fuel cost from distance, fuel efficiency, and gas price.
Electricity Bill Calculator
Estimate your electricity bill from monthly kWh usage.
GPA Calculator
Calculate your Grade Point Average (GPA) from course grades and credits.
Discount Calculator
Calculate discount amount and final price from original price and discount rate.
Concrete Calculator
Calculate the amount of concrete needed for your construction project.
Recipe Unit Converter
Convert between cups, tablespoons, teaspoons, ml, grams, and more.
Blood Alcohol Content Calculator
Estimate Blood Alcohol Content (BAC) from drinks, weight, and time.
Caffeine Intake Calculator
Calculate caffeine content in coffee, tea, and energy drinks vs. daily limits.
Ohm's Law Calculator
Calculate voltage (V), current (A), resistance (Ω), and power (W).
Density Calculator
Calculate density from mass and volume, and identify materials.
Speed, Distance & Time Calculator
Calculate speed, distance, or time given the other two values.
Children BMI Calculator
Calculate BMI percentile for children and teens aged 2-20.
Heart Rate Zone Calculator
Calculate exercise heart rate zones from age and max heart rate.
Protein Intake Calculator
Calculate daily recommended protein intake based on weight, activity, and goals.
Macronutrient Calculator
Calculate optimal carbs, protein, and fat ratios based on your goals.
Mortgage Calculator
Calculate monthly mortgage payments, total interest, and amortization.
Retirement Calculator
Estimate retirement savings needed based on current age, retirement age, and savings.
Inflation Calculator
Calculate the change in purchasing power due to inflation over time.
BMI Calculator (Imperial)
Calculate BMI using feet, inches, and pounds (imperial units).
Running Pace Calculator
Calculate running pace, speed, and estimated finish time from distance and time.
VO2max Calculator
Estimate your VO2max (maximal oxygen uptake) from age, gender, and exercise data.
Number Base Converter
Convert between binary, octal, decimal, and hexadecimal.
Random Number Generator
Generate random numbers in a range, lottery picks, and dice rolls.
Unit Price Calculator
Calculate and compare unit prices to find the best value.
Paint Calculator
Calculate the amount of paint needed for a room based on size and coats.
Sober Time Calculator
Estimate the time needed for blood alcohol to fully clear after drinking.
Solar Panel Calculator
Calculate the number of solar panels needed and estimated savings based on power usage.
Carbon Footprint Calculator
Calculate your carbon footprint from lifestyle, transportation, and energy use.
Numerology Calculator
Calculate your life path number and destiny number from birthdate and name.
Position Size Calculator
Calculate optimal position size based on account balance and risk tolerance.
Futures PnL Calculator
Calculate expected PnL, ROI, and fees for futures trading.
Liquidation Price Calculator
Predict liquidation price for long/short positions with leverage.
Take Profit / Stop Loss Calculator
Calculate TP/SL prices based on desired percentage and fees.
Break-Even Price Calculator
Calculate break-even price considering DCA and fees.
Risk-Reward Ratio Calculator
Analyze R:R ratio, expected value, and required win rate.
Leverage Optimizer
Recommend safe maximum leverage based on account size and drawdown.
Margin Requirement Calculator
Calculate initial and maintenance margin for positions.
Funding Rate Impact Calculator
Predict cumulative funding costs for perpetual futures.
Slippage & Fee Simulator
Simulate real PnL reflecting slippage and exchange fees.
DCA Profit Simulator
Simulate DCA strategy returns and portfolio value.
DCA Breakeven Price
Calculate breakeven price and required pump after DCA.
Portfolio Rebalancing
Suggest buy/sell amounts to reach target asset allocation.
Accumulation Phase
Predict time needed to reach portfolio goal with monthly investments.
HODL Return Projector
Project HODL returns based on future price targets.
Options Greeks Calculator
Calculate Delta, Gamma, Theta, Vega for options trading.
IV Rank Calculator
Calculate IV Percentile and Rank compared to history.
Pair Trading Spread
Calculate spread and cointegration for pair trading.
Arbitrage Opportunity
Identify price differences between exchanges or markets.
Grid Trading Simulator
Simulate grid trading returns and drawdown.
Martingale Calculator
Calculate risk and recovery for Martingale strategies.
Trailing Stop Optimizer
Recommend ATR-based trailing stop distance.
Maximum Drawdown Simulator
Estimate MDD and recovery time based on volatility.
Portfolio Volatility (VaR)
Calculate total portfolio volatility and VaR.
Kelly Criterion Calculator
Recommend optimal bet size based on win rate and R:R.
Tax Liability Estimator
Estimate capital gains tax for crypto and stocks.
Inflation-Adjusted Return
Calculate real return considering inflation rate.
Mining Profitability
Predict mining returns based on hashrate and power cost.
Staking/Airdrop Yield
Calculate APY and total yield for staking/airdrops.
Exchange Fee Comparator
Compare fees across multiple exchanges for best routes.
PDF to Image
Convert each page of a PDF file to PNG images.
URL Shortener
Shorten long URLs and manage your saved links.
Markdown Editor
Write and preview Markdown in real-time.
Password Strength Checker
Assess the strength of a password based on various criteria.
Random Team Generator
Generate random teams from a list of names.
All-in-One Unit Converter
Convert various units (length, weight, volume, temperature, etc.) in one place.
Date Countdown Timer
Count down the days, hours, minutes, and seconds until a specific date.
GPA Predictor
Predict future GPA based on current grades and expected future grades.
Character & Word Counter
Count characters, words, and lines in a given text.
Fuel Efficiency Calculator
Calculate fuel efficiency (MPG or L/100km) based on distance and fuel consumed.
Body Surface Area Calculator
Calculate Body Surface Area (BSA) using various formulas.
Paycheck Calculator
Estimate net pay after taxes and deductions.
BMI Category Explainer
Explain BMI categories and health risks associated with each.
Days Until Event Calculator
Calculate the number of days remaining until a specific event.
Sales Commission Calculator
Calculate sales commission based on sale amount and commission rate.
Discount Percentage Calculator
Calculate the discount percentage from original and sale prices.
Simple Interest Calculator
Calculate simple interest from principal, interest rate, and time period.
Time to Reach Goal Calculator
Calculate the time needed to reach a target value given current value and growth rate.
Average Calculator
Calculate the average (mean) of multiple numbers.
Square Root Calculator
Calculate the square root of a number.
Factorial Calculator
Calculate the factorial of a number.
Permutation & Combination Calculator
Calculate the number of permutations and combinations.
Aspect Ratio Calculator
Calculate the aspect ratio of an image or video.
Pixel Density Calculator
Calculate pixel density (PPI) from screen size and resolution.
Reading Time Calculator
Estimate the reading time for a given text.
Accounts Receivable Turnover Calculator
Calculate AR turnover by dividing revenue by average accounts receivable.
Advertising ROAS Calculator
Calculate return on ad spend.
Aspect Ratio Resizer
Calculate new dimensions while maintaining aspect ratio.
Basal Metabolic Rate Calculator
Calculate BMR based on age, sex, weight, and height.
Billing Hours Calculator
Calculate total billing amount from hourly rate and hours worked.
Billable Hours Calculator
Calculate billable hours from total work time.
Binary to Decimal Converter
Convert binary numbers to decimal.
Binary to Hexadecimal Converter
Convert binary numbers to hexadecimal.
Bit Rate Calculator
Calculate bit rate from file size and duration.
Bounce Rate Calculator
Calculate the percentage of single-page sessions.
Body Adiposity Index Calculator
Calculate BAI from hip circumference and height.
Break-Even Analysis Calculator
Analyze break-even point from fixed costs, variable and selling price.
Calorie Burn Calculator
Calculate calories burned based on activity type and duration.
Calorie Deficit Calculator
Calculate daily calorie deficit for target weight loss.
Car Loan Calculator
Calculate monthly payments and interest for car loans.
Cash Flow Calculator
Calculate cash flow from income and expenses.
Churn Rate Calculator
Calculate customer churn rate over a period.
Click-Through Rate Calculator
Calculate click-through rate from impressions and clicks.
Coffee Cost Calculator
Calculate total cost of coffee subscriptions.
Coffee to Water Ratio Calculator
Calculate coffee-to-water ratio for brewing.
Cooking Measurement Converter
Convert cooking measurement units.
Conversion Rate Calculator
Calculate conversion rate from visitors and conversions.
Cost Per Click Calculator
Calculate CPC from ad spend and clicks.
Cost Per Mille Calculator
Calculate CPM from ad spend and impressions.
Compound Annual Growth Rate Calculator
Calculate CAGR from start value, end value, and period.
Customer Acquisition Cost Calculator
Calculate CAC from total marketing spend and new customers.
Customer Lifetime Value Calculator
Calculate CLV from average purchase frequency and value.
Data Transfer Time Calculator
Calculate transfer time from file size and speed.
Deck Cost Calculator
Calculate total cost of a card game deck.
Debt Service Coverage Ratio Calculator
Calculate DSCR from net operating income and total debt service.
Debt to Equity Ratio Calculator
Calculate D/E ratio from total debt and total equity.
Debt to Income Ratio Calculator
Calculate DTI from monthly debt payments and monthly income.
Dehydration Risk Calculator
Calculate dehydration risk based on activity and environment.
Density Mass Volume Calculator
Enter any two of density, mass, volume to calculate the third.
Dividend Payout Ratio Calculator
Calculate payout ratio from dividends per share and EPS.
Dividend Reinvestment Calculator
Calculate long-term returns from dividend reinvestment.
Dividend Yield Calculator
Calculate dividend yield from dividend per share and stock price.
Earnings Per Share Calculator
Calculate EPS from net income and shares outstanding.
Electric Vehicle Savings Calculator
Calculate fuel savings from switching to an EV.
Engagement Rate Calculator
Calculate engagement rate from followers and total engagements.
Event Budget Planner
Plan total budget and cost items for an event.
Flight Carbon Offset Calculator
Calculate carbon emissions and offset cost for flights.
Flight Time Calculator
Calculate flight time between two airports.
Flooring Calculator
Calculate flooring area and cost for a room.
Frames Per Second to Milliseconds
Convert frame rate to milliseconds per frame.
Free Cash Flow Calculator
Calculate FCF from operating cash flow and capital expenditure.
Gas Mileage Converter
Convert between different fuel economy units.
Golden Ratio Calculator
Perform mathematical calculations based on the golden ratio.
Grade Calculator
Calculate final grade from scores and weights.
Grade Weight Calculator
Calculate weighted average based on grade weights.
Gross Profit Margin Calculator
Calculate gross profit margin from revenue and COGS.
Grocery Unit Price Comparator
Compare unit prices of groceries to find the best deal.
Heat Index Calculator
Calculate heat index from temperature and humidity.
Hexadecimal to RGB Converter
Convert hexadecimal color codes to RGB values.
Ideal Gas Law Calculator
Calculate pressure, volume, or temperature using PV=nRT.
Inflation Rate Calculator
Calculate inflation rate from CPI values.
Interest Coverage Ratio Calculator
Calculate ICR from EBIT and interest expense.
Interest Rate Converter
Convert between annual, monthly, and daily interest rates.
Inventory Days Sales Calculator
Calculate DSI from COGS and average inventory.
Inventory Turnover Calculator
Calculate inventory turnover from COGS and average inventory.
Kitchen Convection Oven Calculator
Calculate temperature and time adjustments for convection ovens.
Kinetic Energy Calculator
Calculate kinetic energy from mass and velocity.
Lease vs Buy Calculator
Compare total cost of leasing vs buying a vehicle.
Loan Payoff Timer
Calculate how extra payments shorten loan payoff time.
Luggage Weight Converter
Convert luggage weight between different units.
Macros Distribution Calculator
Calculate protein, carbs, and fat distribution from calories.
Marketing ROI Calculator
Calculate marketing ROI by subtracting marketing cost from revenue.
Margin of Error Calculator
Calculate margin of error from sample size and confidence level.
Markup Calculator
Calculate selling price from cost and markup percentage.
Meeting Cost Calculator
Calculate meeting cost from participants and duration.
Mean Arterial Pressure Calculator
Calculate MAP from systolic and diastolic blood pressure.
Mortgage Refinance Calculator
Calculate savings and new payments from mortgage refinancing.
Mulch Calculator
Calculate mulch needed for a garden area.
Net Worth Calculator
Calculate net worth by subtracting liabilities from assets.
Operating Profit Margin Calculator
Calculate operating margin from operating income and revenue.
Plant Watering Reminder Cycle
Calculate watering cycle based on plant type and environment.
Planting Distance Calculator
Calculate proper planting distance for different plants.
Pomodoro Cycle Calculator
Plan work/break cycles using the Pomodoro technique.
Potential Energy Calculator
Calculate potential energy from mass, gravity, and height.
Pregnancy Due Date Calculator
Calculate due date based on last menstrual period.
Pressure Calculator
Calculate pressure from force and area.
Price to Book Ratio Calculator
Calculate P/B ratio from stock price and book value per share.
Price to Earnings Ratio Calculator
Calculate P/E ratio from stock price and EPS.
Price to Sales Ratio Calculator
Calculate P/S ratio from market cap and revenue.
Property Tax Estimator
Estimate property tax from assessed value and tax rate.
Project Timeline Calculator
Calculate project end date from task durations and dependencies.
Quick Ratio Calculator
Calculate quick ratio excluding inventory from current assets.
Real Estate Yield Calculator
Calculate yield from real estate investment.
Return on Assets Calculator
Calculate ROA from net income and total assets.
Return on Equity Calculator
Calculate ROE from net income and shareholders equity.
Rice to Water Ratio Calculator
Calculate proper water ratio for different rice types.
Salt Brine Calculator
Calculate salt and water needed for desired brine concentration.
Screen Aspect Ratio Converter
Convert screen size and ratio between formats.
Screen Time Calculator
Analyze daily screen time usage.
Shoe Size Converter
Convert shoe sizes between different countries.
Simplified Tax Bracket Calculator
Calculate simplified tax brackets and tax from income.
Smoking Cost Calculator
Calculate annual cost and health impact of smoking.
Smoking Pack Years Calculator
Calculate pack years from daily cigarettes and years smoked.
Step to Distance Calculator
Convert steps to distance traveled.
Study Time Planner
Plan study schedule until exam date.
Subnet Mask Calculator
Calculate subnet mask from CIDR notation.
Subscription Cost Tracker
Track and analyze monthly/annual subscription costs.
Target Heart Rate Calculator
Calculate target heart rate zones from age and max HR.
Test Score Calculator
Calculate test score from correct answers and total questions.
Time Blocking Planner
Plan and manage time blocks for tasks.
Time Duration Calculator
Calculate the duration between two times.
Torque Calculator
Calculate torque from force and arm length.
Volume Converter
Convert between different volume units.
Waist to Hip Ratio Calculator
Calculate waist-to-hip ratio from measurements.
Wallpaper Calculator
Calculate wallpaper quantity needed for a room.
Water Boiling Point Calculator
Calculate boiling point change based on altitude.
Wave Speed Calculator
Calculate wave speed from wavelength and frequency.
Weighted Average Cost of Capital Calculator
Calculate WACC from equity and debt proportions.
Wind Chill Calculator
Calculate wind chill from temperature and wind speed.
Word Count Calculator
Count the number of words in a text.
Working Capital Calculator
Calculate working capital from current assets and liabilities.
Yeast Calculator
Calculate yeast needed for bread dough.
Viral Coefficient Calculator
Calculate viral coefficient from invitations sent and accepted.
Percentage Change Calculator
Calculate the percentage change between two values.
Pet Age Calculator
Convert pet age to human years.
Pet Food Calculator
Calculate food amount needed based on pet weight and activity.
Fish Tank Volume Calculator
Calculate fish tank volume from dimensions.
Web Apps
Powerful tools that run right in your browser