Free Online Calculators
60 free tools. All processing happens in your browser. No signup. No tracking.
⭐ Most Popular
BMI Calculator
Free online BMI calculator with metric and imperial units. Get your BMI score, WHO classif
Mortgage Calculator
Free online mortgage calculator. Calculate monthly home loan payments including P&I, prope
Compound Interest Calculator
Free online compound interest calculator. Calculate investment growth with monthly contrib
Age Calculator
Free online age calculator. Find your exact age in years, months, and days. Get total mont
Percentage Calculator
Free online percentage calculator with three modes: find what percent of a number, calcula
Tip Calculator
Free online tip calculator with preset percentages and bill splitting. Calculate tip amoun
Loan Calculator
Free online loan calculator. Calculate monthly payments, total payment, and total interest
Scientific Calculator
Use our free online scientific calculator with trigonometry, logarithms, exponents, and mo
❤️ Health & Body
BMR Calculator
Calculate your Basal Metabolic Rate (BMR) for free. Uses Mifflin-St Jeor equation. See dai
Body Fat Calculator
Calculate your body fat percentage for free using the US Navy circumference method. Enter
Calorie Calculator
Calculate your daily calorie needs with our free TDEE calculator. Get maintenance, weight
Macro Calculator
Calculate your daily macronutrient needs for free. Get personalized protein, carbs, and fa
TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) for free. Uses Mifflin-St Jeor BMR wi
Water Intake Calculator
Calculate your daily water intake needs for free. Get a personalized hydration target base
Ovulation Calculator
Find your fertile window and estimated ovulation date for free. Track your cycle to identi
Pregnancy Due Date Calculator
Calculate your estimated due date and current pregnancy week for free. Uses Naegele's rule
💰 Finance
Auto Loan Calculator
Free online auto loan calculator. Calculate monthly car payments, total interest, and tota
Investment Return Calculator
Free online investment return calculator. Project your portfolio growth with monthly contr
Retirement Calculator
Free online retirement calculator. Estimate your retirement nest egg, monthly income using
Savings Calculator
Free online savings calculator. Find out how long it will take to reach your savings goal
Credit Card Payoff Calculator
Free online credit card payoff calculator. Find out when your debt will be paid off or wha
Debt Snowball Calculator
Free online debt snowball calculator. Compare snowball (smallest balance first) vs avalanc
Tax Bracket Calculator
Free online US tax bracket calculator. Calculate your federal income tax by bracket, margi
ROI Calculator
Calculate ROI, annualized return, net gain/loss, payback period. Year-by-year growth proje
Break-Even Calculator
Free online break-even calculator. Find your break-even point in units and revenue, calcul
Profit Margin Calculator
Calculate profit margin, gross profit, markup %. Set target margin, find optimal selling p
Markup Calculator
Calculate selling price from cost and markup %. Find markup from cost and price. Markup vs
Business Valuation Calculator
Estimate business value using revenue multiples, PE ratio, asset-based valuation. Industry
🔢 Math & Statistics
Fraction Calculator
Perform fraction arithmetic online for free. Add, subtract, multiply, and divide fractions
Ratio Calculator
Simplify ratios to lowest terms and solve proportions with cross-multiplication. Step-by-s
Probability Calculator
Calculate nCr combinations and nPr permutations. Shows formula, factorial expansion, plain
Prime Number Calculator
Check if a number is prime. Prime factorization with step-by-step. List primes in a range
Fibonacci Calculator
Generate Fibonacci sequence, find nth Fibonacci number (supports BigInt), check if a numbe
Quadratic Formula Calculator
Solve quadratic equations with step-by-step solutions. Shows discriminant, real or complex
Pythagorean Theorem Calculator
Solve any right triangle using a² + b² = c². Enter two sides to find the third. Shows form
Slope Calculator
Find slope, y-intercept, line equation, midpoint, distance between two points. Interactive
Mean Median Mode Calculator
Calculate mean, median, mode, range, sum, min, and max for any dataset. Sorted data view.
Statistics Calculator
Compute descriptive statistics: mean, median, mode, std dev, variance, quartiles, range. E
Random Number Generator
Generate cryptographically secure random numbers for free. Choose integer or decimal, set
🏠 Home & Construction
Square Footage Calculator
Calculate the square footage or square meters of rooms and properties for free. Add multip
Flooring Calculator
Estimate flooring material. Hardwood, tile, carpet, vinyl. Square footage, boxes, wastage
Paint Calculator
Calculate paint needed for any room. Walls, ceiling, doors, windows, multiple coats. Gallo
Roofing Calculator
Calculate roofing materials with pitch factor. Squares, shingle bundles, underlayment, rid
Concrete Calculator
Calculate concrete for slabs, footings, columns. Cubic yards/meters, bag counts, ready-mix
Fence Calculator
Estimate fencing materials. Posts, rails, pickets, concrete bags, gates. Privacy, picket,
Mulch Calculator
Estimate mulch, soil, gravel for landscaping. Rectangle, circle, irregular shapes. Cubic y
Volume Calculator
Calculate volume of 3D shapes: cube, sphere, cylinder, cone, rectangular prism. Instant wi
Area Calculator
Calculate area of common shapes: rectangle, triangle, circle, trapezoid, parallelogram. In
📅 Time & Date
Date Difference Calculator
Calculate the exact number of days, weeks, months, and years between any two dates for fre
Day of the Week Calculator
Find out what day of the week any date falls on for free. Uses Zeller's algorithm and work
Time Duration Calculator
Calculate the time duration between two times in hours and minutes for free. Handles overn
Fuel Cost Calculator
Free online fuel cost calculator. Estimate trip fuel cost for any distance. Supports miles
Discount Calculator
Free online discount calculator with two modes: calculate by percentage off or by fixed sa
💼 Salary & Career
Salary Calculator
Free online salary calculator. Convert hourly to annual salary or annual to hourly. See mo
Hourly Rate Calculator
Free online hourly rate calculator. Convert annual salary to hourly rate or hourly wage to
Rent Affordability Calculator
Free online rent affordability calculator. Determine how much rent you can afford based on
Net Worth Calculator
Free online net worth calculator. Calculate your total assets, liabilities, and net worth.
GPA Calculator
Calculate your GPA on a 4.0 scale for free. Add unlimited courses with credit hours and le
Grade Calculator
Calculate the score you need on your final exam to reach your target grade. Free final gra
APR Calculator
Free online APR calculator. Calculate the true annual percentage rate including originatio