Online Calculators
Professional calculators for finance, health, engineering, and business.
Financial
(47 tools)Everyday Finance
Loan Calculator
Calculate monthly payments, total interest, and amortization schedules.
Mortgage Calculator
Calculate monthly mortgage payments with taxes and insurance, plus a full amortization schedule and extra payment payoff calculator.
Compound Interest Calculator
See how your investments grow with compound interest.
Savings Calculator
Project your savings over time with regular contributions.
Percentage Calculator
Calculate percentages, percentage change, and percent of a number.
VAT Calculator
Add or remove VAT from any amount.
Salary Calculator
Convert salary between hourly, weekly, monthly, and annual rates.
Investing & Markets
TVM Calculator
Solve for present value, future value, rate, or periods using Time Value of Money.
NPV Calculator
Determine investment profitability by discounting future cash flows to the present.
IRR Calculator
Calculate the Internal Rate of Return — the expected annual growth rate of an investment.
CAGR Calculator
Compute the Compound Annual Growth Rate of any investment over a specified period.
Bond Yield Calculator
Find yield to maturity or fair price for any bond given coupon rate and term.
Corporate Finance
WACC Calculator
Calculate Weighted Average Cost of Capital from equity, debt, and preferred stock.
Operating Leverage Calculator
Analyze how a sales change impacts operating income using degree of operating leverage.
Business Valuation Calculator
Estimate enterprise value using EBITDA, revenue multiples, or P/E ratio.
Ad Revenue Calculator
Estimate daily, monthly, and annual ad revenue from page views, RPM, and fill rate.
DCF Calculator
Value an investment by discounting projected free cash flows and terminal value.
Tax & Accounting
Depreciation Calculator
Calculate asset depreciation using Straight-Line, Double Declining, or Sum-of-Years.
Tax Bracket Calculator
Find your marginal tax rate and federal income tax liability by filing status (US 2024).
Payroll Calculator
Calculate gross-to-net pay with federal withholding, FICA, and state taxes (US).
Sales Tax Calculator
Add or remove sales tax from any amount for US states and international jurisdictions.
Income Tax Calculator
Estimate income tax liability across multiple countries with progressive bracket calculation.
Corporation Tax Calculator
Calculate corporate tax liability for UK, US, Ireland, Germany, and more.
PAYE Calculator
UK PAYE 2024/25 — calculate income tax, NI, pension, and take-home pay.
Withholding Tax Calculator
Calculate tax withheld at source on dividends, interest, royalties, and services.
Rental Income Tax Calculator
Calculate tax on rental income after allowable expenses and depreciation.
Property Tax Calculator
Estimate annual property tax from assessed home value, local mill/tax rate, assessment ratio, and homestead exemptions.
Capital Gains Tax Calculator
Estimate CGT on asset sales for US, UK, Australia, and more.
Betting Tax Calculator
Calculate tax on gambling winnings by jurisdiction. Includes US, UK, Australia, and more.
Turnover Tax Calculator
Simplified turnover-based tax for SMBs (South Africa, Philippines, Rwanda, and custom).
Cryptocurrency Tax Calculator
Calculate crypto capital gains tax using FIFO, LIFO, HIFO, or Average Cost. Covers US, UK, Australia, Canada and more.
Loans & Credit
Auto Loan Calculator
Calculate car loan payments including sales tax, trade-in, and full amortization.
Loan Amortization Calculator
Generate a full amortization schedule with optional extra payments to pay off early.
Lease vs Buy Calculator
Compare total cost of leasing versus buying a vehicle or asset over the full term.
Credit Card Payoff Calculator
Find how long to pay off your balance and how much interest you will pay.
Shipping & Commerce
Shipping Rates Calculator
Estimate shipping costs by package weight, dimensions (dimensional weight), and carrier.
Car Rent Cost Calculator
Calculate total car rental cost including daily rate, insurance, extras, mileage, and fuel.
Commission Calculator
Calculate sales commission using flat rate, tiered brackets, or split between multiple reps.
Insurance & Protection
Savings & Retirement
Utilities & Bills
Economics
GDP Calculator
Calculate Gross Domestic Product using the Expenditure Method (C + I + G + net exports).
Inflation Calculator
See how the buying power of money changes over time using the Consumer Price Index (CPI).
GDP Per Capita Calculator
Measure economic output per person and compare living standards across countries.
Health & Fitness
(29 tools)Core Health Metrics
BMI Calculator
Calculate your Body Mass Index (BMI) and health category.
BMR Calculator
Calculate your Basal Metabolic Rate and daily calorie needs.
Age Calculator
Calculate exact age in years, months, and days.
Calorie Calculator
Calculate daily calorie needs based on activity level.
Ideal Weight Calculator
Find your ideal body weight using multiple formulas.
Water Intake Calculator
Calculate daily water intake recommendations.
Daily Life & Wellness
Sleep Quality Calculator
Find the best bedtime or wake-up time based on 90-min sleep cycles.
Pregnancy Due Date Calculator
Calculate your estimated due date, trimester, and milestones.
Period Calculator
Predict your next 6 periods, fertile windows, and ovulation dates.
Ovulation Tracker
Estimate your fertile window and ovulation day for family planning.
Blood Alcohol (BAC) Calculator
Estimate blood alcohol concentration by weight, gender, and drinks.
Step to Distance Calculator
Convert daily steps into km or miles based on your stride length.
Smoke Cost Calculator
Calculate how much smoking costs you daily, monthly, and yearly — and what you could save by quitting.
Cardio & Workout
Target Heart Rate Calculator
Find your heart rate zones for fat burn, cardio, and peak training.
Calories Burned Calculator
Estimate calories burned for any exercise using MET values.
Pace Calculator
Calculate running pace, finish time, or distance with race projections.
VO2 Max Calculator
Estimate your cardiovascular fitness and VO2 max score.
Heart Rate Recovery Calculator
Measure how fast your heart recovers after exercise.
Wilks Calculator
Compare powerlifting strength across bodyweights using Wilks score.
Rest Timer Calculator
Find optimal rest periods between sets with a built-in timer.
Nutrition & Calories
TDEE Calculator
Calculate your Total Daily Energy Expenditure by activity level.
Calorie Deficit / Surplus Calculator
Find your daily calorie target to lose, maintain, or gain weight.
Macro Calculator
Calculate ideal protein, carbs, and fat intake for your goal.
Nutrition Calculator
Calculate your personalised daily nutritional requirements — calories, protein, carbs, fat, fibre, and water.
Body Composition
Engineering
(3 tools)Business
(5 tools)ROI Calculator
Calculate Return on Investment (ROI) percentage.
Profit Margin Calculator
Calculate gross, net, and operating profit margins.
Break-Even Calculator
Find the break-even point for your business or product.
Discount Calculator
Calculate sale price after discount or find discount percentage.
Markup Calculator
Calculate selling price from cost with desired markup.
Math & Education
(16 tools)Binary ⇄ Decimal Converter
Convert between binary, octal, decimal, and hexadecimal with a place-value breakdown.
Hex to RGB Converter
Convert hex color codes to RGB/HSL, preview the swatch, and check text contrast.
Fraction to Decimal Converter
Convert fractions to decimals and decimals back to simplified fractions, step by step.
Decimal to Percent Converter
Convert decimals to percentages and percentages back to decimals with clear rules.
Minutes to Decimal Converter
Convert minutes and hours into decimal hours for payroll, billing, and timesheets.
Roman Numerals Converter
Convert numbers to Roman numerals and back, with a symbol-by-symbol breakdown.
Factor Calculator
Find all factors, prime factorization, GCF, and LCM of any whole number.
Root Calculator
Calculate square roots, cube roots, nth roots, and simplify radical expressions.
Geometry Calculator
Calculate area, perimeter, volume, and surface area for common 2D and 3D shapes.
Factorial Calculator
Calculate factorials (n!) instantly with a step-by-step product chain and quick reference table.
Random Number Generator
Generate random numbers within a custom range — integers or decimals, single or multiple, unique or repeating.
Exponent Calculator
Calculate powers, negative and fractional exponents, and scientific notation with full step-by-step breakdowns.
Time Addition and Subtraction Calculator
Add or subtract hours, minutes, and seconds across multiple time values, with day rollover handling.
Hypotenuse Calculator
Find the hypotenuse of a right triangle from its two legs using the Pythagorean theorem.
Right Triangle Side and Angle Calculator
Solve any right triangle for missing sides and angles from any two known values.
Radius of a Circle Calculator
Calculate the radius of a circle from its diameter, circumference, or area — with reverse calculations too.