Calculator Tools

Free online calculators for math, finance, health, and everyday calculations. Age, percentage, loan, BMI calculators and more.

82 free tools available

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Free Age Calculator Online

Calculate your exact age in years, months, and days with zodiac signs. Free, fast, and works entirely in your browser with no sign-up required.

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Free Percentage Calculator

Calculate percentages easily with multiple calculation modes. Free, fast, and works entirely in your browser with no sign-up required.

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Free Unit Converter Online

Convert between units of length, weight, temperature, area, volume, and speed. Free, fast, and works entirely in your browser with no sign-up required.

Free Byte Converter Online

Convert between digital storage units with binary and decimal systems. Free, fast, and works entirely in your browser with no sign-up required.

Free Aspect Ratio Calculator

Calculate and convert aspect ratios with visual preview. Free, fast, and works entirely in your browser with no sign-up required.

Free Loan Calculator Online

Calculate monthly payments, total interest, and amortization schedule. Free, fast, and works entirely in your browser with no sign-up required.

Free BMI Calculator Online

Calculate Body Mass Index with metric or imperial units. Free, fast, and works entirely in your browser with no sign-up required.

Free Tip Calculator Online

Calculate tips for restaurants and services with bill splitting. Free, fast, and works entirely in your browser with no sign-up required.

Free Discount Calculator

Calculate discounts, sale prices, and savings instantly. Free, fast, and works entirely in your browser with no sign-up required.

Free Date Difference Calculator

Calculate the difference between two dates in days, weeks, and months. Free, fast, and works entirely in your browser with no sign-up required.

Free Scientific Calculator

Advanced calculator with trigonometric and logarithmic functions. Free, fast, and works entirely in your browser with no sign-up required.

Free Compound Interest Calculator

Calculate compound interest with regular contributions and detailed breakdown. Free, fast, and works entirely in your browser with no sign-up required.

Free Mortgage Calculator

Calculate monthly mortgage payments with amortization schedule. Free, fast, and works entirely in your browser with no sign-up required.

Free Savings Goal Calculator

Plan your savings goals with monthly deposits and interest. Free, fast, and works entirely in your browser with no sign-up required.

Free GPA Calculator Online

Calculate your GPA with multiple semesters and courses. Free, fast, and works entirely in your browser with no sign-up required.

Free Time Duration Calculator

Add and subtract time durations in hours, minutes, and seconds. Free, fast, and works entirely in your browser with no sign-up required.

Free Fuel Cost Calculator

Calculate trip fuel costs, estimate gas expenses, and compare vehicle fuel efficiency. Free, fast, and works entirely in your browser with no sign-up required.

Free Investment Returns Calculator

Calculate future investment value with various growth scenarios. Free, fast, and works entirely in your browser with no sign-up required.

Free Loan Amortization Calculator

View complete amortization schedules for any loan. Free, fast, and works entirely in your browser with no sign-up required.

Free Retirement Calculator

Plan retirement with savings projections and goal tracking. Free, fast, and works entirely in your browser with no sign-up required.

Simple Interest Calculator

Calculate simple interest (I = P x r x t) with principal, rate, and time. View month-by-month breakdown and export CSV. Free, fast, and works entirely in your browser with no sign-up required.

ROI Calculator

Calculate return on investment (ROI), net profit, and annualized ROI (CAGR). Supports optional holding period with CSV export.

Break-Even Calculator

Calculate break-even point in units and revenue with contribution margin analysis and profit/loss scenarios. Free, fast, and works entirely in your browser with no sign-up required.

TDEE Calculator

Calculate Total Daily Energy Expenditure and BMR with Mifflin-St Jeor formula. Get calorie targets for cut, maintain, and bulk goals.

Car Loan Calculator

Calculate monthly car payments with down payment, trade-in, sales tax, APR, and term. Full amortization schedule and CSV export.

Student Loan Calculator

Calculate student loan monthly payments, total interest, and payoff time. Models grace-period interest and extra-payment savings.

Paycheck Calculator

Estimate US take-home pay with federal, state, FICA, 401(k), HSA, and health insurance deductions across weekly, bi-weekly, semi-monthly, and monthly pay periods.

Hourly to Salary Calculator

Bidirectional hourly wage and annual salary converter with all pay frequencies (hourly, daily, weekly, bi-weekly, semi-monthly, monthly, annual).

Calorie Calculator

Calculate daily calorie needs for weight loss, maintenance, or muscle gain. Uses Mifflin-St Jeor and Harris-Benedict BMR formulas with activity multipliers and 4/8/12-week weight projections.

Macro Calculator

Calculate daily macronutrient targets (protein, carbs, fat) in grams from your calories. Presets for cutting, bulking, keto, low-carb, high-protein, plus custom splits and per-meal breakdowns.

Body Fat Calculator

Calculate body fat percentage using the US Navy circumference method and BMI-based estimate. Get lean body mass, fat mass, category, and age-group ideal ranges.

Standard Deviation Calculator

Compute population and sample standard deviation, variance, mean, median, mode, and range with a full step-by-step deviation table. CSV export.

Dividend Calculator

Project dividend income, DRIP share growth, yield on cost, and total return over any time horizon with tax-aware reinvestment.

Dollar Cost Averaging (DCA) Calculator

Simulate historical DCA outcomes and project future portfolio growth with recurring contributions. Compare DCA vs lump-sum and export CSV.

Trading Position Size Calculator

Calculate optimal position size for stocks, forex, crypto, and futures. Risk-based sizing with leverage, R:R ratio, and margin requirements.

Risk / Reward Calculator

Calculate risk/reward ratios, breakeven win rates, and expected value for long or short trades with up to three take-profit targets.

Inflation Calculator

Calculate how inflation erodes purchasing power over time. Convert between present and future values with historical US CPI reference data.

FIRE Number Calculator

Calculate your Financial Independence Retire Early number using the 25x rule and 4% safe withdrawal rate. Includes Lean, Fat, Coast, and Barista FIRE variants.

Net Worth Calculator

Calculate your net worth by tracking assets and liabilities across categories. Visualize with pie charts, debt-to-asset ratio, liquidity ratio, and US age benchmarks.

Emergency Fund Calculator

Calculate how much you need in your emergency fund based on expenses, job stability, and dependents. Project growth with HYSA interest.

Quadratic Equation Solver

Solve ax^2 + bx + c = 0 with discriminant analysis, exact radical and complex roots, step-by-step work, vertex/factored forms, and visual parabola graph.

Grade Calculator

Calculate weighted course grades from assignments and exams, figure out the final exam score you need, and customize letter grade scales.

Running Pace Calculator

Calculate running pace, time, or distance with kilometer and mile splits plus Riegel race time predictions for 5K, 10K, half, and marathon.

Free Blood Sugar Converter

Convert blood sugar between mg/dL and mmol/L with reference ranges and HbA1c estimator. Free, fast, and works entirely in your browser with no sign-up required.

Free Water Intake Timer & Schedule

Plan your daily water drinking schedule with timed reminders based on your goals. Free, fast, and works entirely in your browser with no sign-up required.

Free Step Count to Calories Calculator

Calculate calories burned from step count based on your weight, height, and pace. Free, fast, and works entirely in your browser with no sign-up required.

Free Menstrual Cycle Calculator

Predict your next periods, fertile window, and ovulation date based on cycle length. Free, fast, and works entirely in your browser with no sign-up required.

Matrix Calculator

Perform matrix addition, multiplication, determinant, inverse, transpose, RREF, rank, and power up to 6x6 with optional step-by-step solutions.

Crypto Profit Calculator

Calculate cryptocurrency trade profit, ROI, fees, taxes, and break-even price for single trades or dollar-cost averaging.

Staking Rewards Calculator

Calculate crypto staking rewards with APY, compound frequency, validator fees, and price appreciation. Year-by-year growth projection.

Mining Profitability Calculator

Estimate crypto mining profit for BTC, ETC, RVN, XMR, KAS, and LTC with electricity cost, pool fees, and hardware breakeven.

VAT Calculator

Add or remove VAT with country presets for UK, EU, Switzerland, Australia, Canada GST, UAE, and more. Bulk mode with CSV export.

Income Tax Calculator (Multi-Country)

Estimate income tax across US, UK, Canada, Australia, Germany, and India with bracket-level breakdown, effective/marginal rates, and monthly take-home.

Forex Pip Calculator

Calculate pip value in quote and account currency for 12 major forex pairs plus gold and silver. Standard, mini, micro, nano lots with R:R and margin.

Forex Lot Size Calculator

Calculate optimal forex lot size from account balance, risk %, stop loss, and pip value. Standard/mini/micro/nano lots with margin requirements.

Heart Rate Zone Calculator

Calculate max heart rate and 5 training zones using Tanaka, Haskell, Gulati, or Nes formulas. Includes Karvonen HR reserve zones and workout planner.

Blood Pressure Analyzer

Classify blood pressure into AHA/ACC categories, calculate pulse pressure and MAP, track readings over time with 7-day average and trend detector.

Sleep Cycle Calculator

Find the best bedtimes and wake times based on 90-minute sleep cycles. Includes age-based sleep recommendations, nap guide, and sleep quality tips.

Ideal Weight Calculator

Calculate ideal body weight using Hamwi, Devine, Robinson, and Miller formulas plus a healthy BMI range. Supports metric/imperial, frame size, and current-weight comparison.

Water Intake Calculator

Calculate daily water intake from body weight, age, activity, climate, and pregnancy/breastfeeding status. Results in liters, oz, cups, and bottles.

Running Time Calculator

Predict race finish times at 1K, 5K, 10K, half, marathon, and ultra distances using the Riegel formula from a single known race time.

Pregnancy Due Date Calculator

Calculate your estimated due date using last menstrual period, conception date, or ultrasound. Shows current gestational age, trimester, and prenatal milestone timeline.

Ovulation Calculator

Predict fertile window, peak fertility days, ovulation date, and next period from your last menstrual period and cycle length. Shows 6 upcoming cycles.

Cryptocurrency Converter

Convert between 15 cryptocurrencies and 10 major fiat currencies with an editable price sheet, conversion matrix, and CSV export. 100% client-side.

Bond Yield Calculator

Calculate current yield, yield to maturity (YTM), yield to call, Macaulay and modified duration, and cash flow schedules for any bond investment.

Freelance Rate Calculator

Calculate ideal freelance hourly, daily, weekly, and project rates based on target income, taxes, expenses, and availability.

Statistics Calculator

Comprehensive statistical analysis: mean, median, mode, variance, std dev, IQR, quartiles, percentiles, outlier detection, skewness, kurtosis, histogram, and box plot.

Time Duration Calculator

Calculate time differences, find the duration between dates, add/subtract duration to dates, and convert between time units with precision.

Math Equation Solver

Evaluate math expressions safely (Shunting-yard, no eval), solve linear equations and 2x2 systems, and compute percentage problems with step-by-step solutions.

BMR Calculator

Calculate Basal Metabolic Rate using Mifflin-St Jeor, Harris-Benedict, Katch-McArdle, and Cunningham formulas. Side-by-side comparison with food equivalents.

Smoking Cost Calculator

Calculate the financial cost of smoking with projected expenses, investment alternatives, and a health benefits timeline for quitting.

BAC Calculator

Estimate blood alcohol content using the Widmark formula with drink presets, custom inputs, eating modifier, and metabolization timeline.

Options Profit Calculator

Calculate profit, loss, and breakeven for stock options. Single-leg and multi-leg strategies: bull call, bear put, iron condor, straddle, strangle.

Margin Call Calculator

Calculate when a margin call triggers based on equity, loan, maintenance margin, and stock price. Reference table at different maintenance levels.

Budget Planner

Plan monthly budget with income/expense tracking across 12 categories. 50/30/20 rule analysis, pie chart, and 12-month savings projection.

Expense Tracker

Track daily expenses by category and payment method. Filter, analyze with bar charts, monthly breakdowns, and CSV export. localStorage persistence.

Black-Scholes Calculator

Calculate European option prices, Greeks (Delta, Gamma, Theta, Vega, Rho), and sensitivity analysis using the Black-Scholes model.

Body Shape Calculator

Determine your body shape type from bust/chest, waist, and hip measurements with style recommendations and visual silhouette.

Waist-to-Hip Ratio Calculator

Calculate WHR with WHO health risk classification, visual gauge, age-based reference table, and BMI comparison. Free, fast, and works entirely in your browser with no sign-up required.

Stock Price Tracker

Track stock portfolio with manual price entries, calculate gains/losses, view allocation pie chart. localStorage persistence.

Cholesterol Analyzer

Analyze cholesterol panel (Total, HDL, LDL, Triglycerides) per AHA guidelines with ratios, cardiovascular risk, and lifestyle recommendations.

Child Growth Chart

Track child growth with WHO/CDC percentile charts for weight-for-age, height-for-age, and BMI-for-age with classification badges.

Guides & tutorials

Step-by-step guides to get the most out of these tools.

Free Online Calculators: The Complete Guide How to Calculate a Percentage How to Calculate Your BMI How to Calculate Your Exact Age How to Calculate Monthly Loan Payments How to Calculate Compound Interest

About Calculator Tools

From quick everyday math to finance, health, and date calculations, our Calculator Tools give you instant, accurate answers. Work out percentages, ratios, ages, and time differences; estimate loans, mortgages, tips, and discounts; or calculate BMI, calories, and more — each calculator is purpose-built and explains its result clearly.

They help students, shoppers, freelancers, and professionals make decisions without spreadsheets. Everything runs in the browser with no signup. For unit-to-unit math reach for our Converter Tools, and for money-specific planning see our Finance Tools.

Related categories

Finance Tools Health & Fitness Tools Converter Tools