Math & Calculators
57 toolsFree browser-based calculators and math tools. Percentage, loan, BMI, tip calculators, and more. Instant results with no server round-trips.
Age Calculator — Years, Months & Days
Free age calculator. Calculate exact age in years, months, days, total hours. Zodiac sign, day of week born, days until next birthday — 100% client-side. 100% serverless.
Amortization Calculator — Free Loan Schedule Tool
Free amortization calculator with full payment schedule, principal vs interest chart, and CSV export. Calculate monthly payments for any loan — 100% client-side. 100% serverless.
Aspect Ratio Calculator — Visual
Free, private, serverless aspect ratio calculator with visual preview. Calculate aspect ratios from pixel dimensions, use common presets (16:9, 4:3, 1:1, 9:16), resize with locked ratio, and view pixel count and megapixel stats. With visual proportion preview. No data leaves your browser — 100% client-side.
BMI Calculator — Body Mass Index
Free, private BMI calculator. Calculate your Body Mass Index with metric or imperial units. Visual BMI scale, category classification, healthy weight range — 100% client-side. 100% serverless.
Bill Splitter — Free Tip & Tax Calculator
Free bill splitter calculator. Split restaurant bills with tip presets, tax, and per-person breakdown. 100% client-side. 100% serverless.
Body Fat Calculator — Free US Navy Method Tool
Free body fat percentage calculator using the US Navy method. Enter height, waist, neck, hip measurements. Category classification included. 100% client-side. 100% serverless.
Break-Even Calculator — Free Business Analysis Tool
Free break-even calculator with contribution margin analysis and profit/loss checker. Find how many units you need to sell — 100% client-side. 100% serverless.
Calorie Calculator — Free TDEE & BMR Calculator
Free calorie calculator. Find your TDEE, BMR, and daily calories for weight loss, maintenance, or gain. Macro breakdown included. 100% client-side. 100% serverless.
Chart Maker — Bar, Line, Pie & More
Free, private, serverless chart maker. Create bar, line, pie, doughnut, radar, and polar charts in seconds. 6 color themes, PNG/SVG export, and copy to clipboard. 100% runs in your browser.
Circle Calculator — Area, Circumference, Arc & Sector
Free circle calculator for area, circumference, diameter, arc length, and sector area — 100% client-side. 100% serverless.
Compound Interest Calculator — Free Investment Growth Tool
Free compound interest calculator with monthly contributions, chart, and year-by-year breakdown. 5 compounding frequencies. 100% client-side. 100% serverless.
Date Add/Subtract Calculator — Add Days, Weeks, Months
Free date calculator. Add or subtract days, weeks, months, or years from any date — 100% client-side. 100% serverless.
Date Difference Calculator — Free Days Between Dates Tool
Free date difference calculator. Find days, weeks, months, years, hours, and business days between any two dates. Add/subtract days from a date. 100% serverless.
Discount Calculator
Free, private, serverless discount calculator. Calculate sale prices with any discount percentage. Supports multiple currencies (USD, EUR, GBP, JPY, INR, AED, SAR). Bulk discount comparison table to see savings at different percentages. No data leaves your browser — 100% client-side.
Electricity Cost Calculator — Free kWh Energy Bill Tool
Free electricity cost calculator. Add devices with wattage and usage hours to estimate daily, monthly, yearly costs and CO₂ emissions. 100% client-side. 100% serverless.
Equation Solver — Free Linear, Quadratic & Cubic Solver
Free equation solver for linear, quadratic, and cubic equations. Find real and complex roots with discriminant analysis — 100% client-side. 100% serverless.
Excel Formula Helper — VLOOKUP, SUMIFS, INDEX-MATCH & 30+ Formulas
Free, private, serverless Excel formula helper. Search 30+ formulas with syntax, examples, and tips: VLOOKUP, XLOOKUP, INDEX-MATCH, SUMIFS, COUNTIFS, IFS, IF, PMT, DATEDIF, TEXTJOIN, and more. Copy formulas instantly with one click. Runs 100% in your browser — no data leaves your device.
Exponent Calculator — Power & Root Calculator
Free exponent calculator. Calculate xⁿ, x², x³, √x, 1/x, and log(x) — 100% client-side. 100% serverless.
Factorial Calculator — Free n! Calculator with BigInt
Free factorial calculator supporting n! up to 1000!, double factorial n!!, subfactorial !n, and trailing zeros — 100% client-side. 100% serverless.
Fibonacci Sequence Generator — Free BigInt Calculator
Free Fibonacci sequence generator with BigInt precision up to 500 terms. See golden ratio convergence — 100% client-side. 100% serverless.
Fraction Calculator — Free Add, Subtract, Multiply, Divide
Free fraction calculator. Add, subtract, multiply, divide fractions with auto-simplification and mixed number display. 100% client-side. 100% serverless.
Fuel Cost Calculator — Free Trip Gas Cost Estimator
Free fuel cost calculator. Estimate gas cost for any trip with distance, consumption rate, fuel price. Supports km/miles. 100% client-side. 100% serverless.
GCD & LCM Calculator — Greatest Common Divisor & Least Common Multiple
Free GCD and LCM calculator with Euclidean algorithm steps. Calculate for multiple numbers at once — 100% client-side. 100% serverless.
GPA Calculator — Free Grade Point Average Tool
Free GPA calculator. Add courses with credits and grades (A+ to F) to calculate your grade point average. 100% client-side. 100% serverless.
Heart Rate Zone Calculator — Free Karvonen Training Zones
Free heart rate zone calculator using Karvonen method. Find your 5 training zones with max HR and resting HR. 100% client-side. 100% serverless.
Ideal Weight Calculator — Free Multiple Formula Tool
Free ideal weight calculator using 4 formulas (Devine, Robinson, Miller, Hamwi) with BMI-based healthy range. 100% client-side. 100% serverless.
Inflation Calculator — Free Purchasing Power Tool
Free inflation calculator showing how purchasing power changes over time. Compare values across years with customizable inflation rate — 100% client-side. 100% serverless.
Leap Year Checker — Is It a Leap Year?
Free leap year checker. Find out if any year is a leap year, with next/previous leap years — 100% client-side. 100% serverless.
Loan/EMI Calculator
Free, private, serverless loan and EMI calculator. Calculate monthly payments, total interest, and total payment for any loan. Visual principal vs interest chart. Full amortization schedule with monthly breakdown. Supports multiple currencies (USD, EUR, GBP, JPY, INR, AED). No data leaves your browser — 100% client-side.
Logarithm Calculator — Free Log Calculator Any Base
Free logarithm calculator with custom base, natural log (ln), log₁₀, and log₂ — 100% client-side. 100% serverless.
Markup Calculator — Free Markup & Margin Tool
Free markup and margin calculator. Convert cost to price, calculate profit margins, and compare markup vs margin — 100% client-side. 100% serverless.
Matrix Calculator — Free Online Matrix Operations
Free matrix calculator supporting 2×2 and 3×3 operations: addition, subtraction, multiplication, determinant, inverse, and transpose — 100% client-side. 100% serverless.
Measurement Converter — 8 Categories, 50+ Units
Free measurement converter. Convert length, weight, temperature, volume, area, speed, time, data — 50+ units. Real-time results — 100% client-side. 100% serverless.
Mortgage Calculator — Free Home Loan Payment Tool
Free mortgage calculator with amortization schedule, property tax, insurance. Calculate monthly payments — 100% client-side. 100% serverless.
Number Base Converter
Free, private, serverless number base converter. Convert between binary, octal, decimal, hexadecimal, and custom bases (2-36) instantly. Supports bulk conversion, shows bit and byte counts. 100% client-side — no data leaves your browser.
Ohm's Law Calculator — Free V/I/R/P Electrical Tool
Free Ohm's Law calculator. Enter any 2 of Voltage, Current, Resistance, Power to calculate the other 2. 100% client-side. 100% serverless.
Paint Calculator — Free Wall Area & Gallons Estimator
Free paint calculator. Add rooms with dimensions, doors, windows to estimate wall area, gallons needed, and cost. 100% client-side. 100% serverless.
Percentage Calculator
Free, private, serverless percentage calculator with 5 modes: X% of Y, X is what % of Y, percentage change, increase/decrease by %, and tip calculator. Real-time results as you type. 100% client-side — no data leaves your browser.
Permutation & Combination Calculator — Free nPr nCr Tool
Free permutation and combination calculator. Calculate P(n,r), C(n,r), with repetition, and factorial. Supports large numbers. 100% client-side. 100% serverless.
Prime Number Checker — Free Primality & Factorization Tool
Free prime number checker with primality test, range finder, and prime factorization — 100% client-side. 100% serverless.
Probability Calculator — Free Odds & Chance Tool
Free probability calculator. Calculate single event probability, multiple events (AND/OR), coin flips, dice rolls. 100% client-side. 100% serverless.
Profit Margin Calculator — Revenue & Markup
Free profit margin calculator. Calculate gross profit, margin %, markup %, net profit from cost, price, quantity, and expenses — 100% client-side. 100% serverless.
Pythagorean Theorem Calculator — a² + b² = c²
Free Pythagorean theorem calculator. Find missing sides, area, perimeter, and angles — 100% client-side. 100% serverless.
Quadratic Formula Calculator — Solve ax² + bx + c = 0
Free quadratic formula calculator. Find roots, discriminant, and vertex of any quadratic equation — 100% client-side. 100% serverless.
ROI Calculator — Return on Investment
Free ROI calculator. Calculate return on investment, annualized ROI, and profit/loss from investment and return amounts — 100% client-side. 100% serverless.
Retirement Calculator — Free Savings Projector
Free retirement calculator with savings projection, 4% rule income, inflation adjustment, and growth chart. Plan your 401k/IRA — 100% client-side. 100% serverless.
Salary Calculator — Free Paycheck Estimator
Free salary calculator with tax breakdown, gross-to-net conversion, and multiple pay frequencies. Estimate your take-home pay — 100% client-side. 100% serverless.
Savings Goal Calculator — Free Monthly Savings Planner
Free savings goal calculator. Find how long to reach your savings target with monthly contributions and interest. 100% client-side. 100% serverless.
Scientific Calculator — Trig, Log & More
Free scientific calculator. Trigonometry (sin/cos/tan), logarithms, square root, powers, π, e, DEG/RAD — 100% client-side with keyboard support. 100% serverless.
Square Root Calculator — Nth Root & Bulk Root Finder
Free, private, serverless square root calculator with bulk support. Calculate √x, ∛x, nth roots, perfect number checks, and advanced math — 100% client-side.
Standard Deviation Calculator — Free Statistics Tool
Free standard deviation calculator with mean, median, mode, variance, and population/sample std dev — 100% client-side. 100% serverless.
Statistics Calculator
Free, private, serverless statistics calculator. Compute mean, median, mode, variance, standard deviation, quartiles, percentiles, skewness, kurtosis, geometric mean, harmonic mean, and coefficient of variation. Paste your data set and get instant results with grouped descriptive statistics — no data leaves your browser.
Subnet Calculator — Free CIDR/IP Networking Tool
Free subnet calculator. Enter IP and CIDR to get network, broadcast, host range, subnet mask, wildcard, IP class. 100% client-side. 100% serverless.
Tax Calculator — Free Income Tax Estimator
Free federal income tax calculator with 2024 US brackets, bracket breakdown, and filing status options. Estimate your tax liability — 100% client-side. 100% serverless.
Tip Calculator — Bill Splitter
Free tip calculator. Calculate tip amount, total, and per-person split. Quick presets for 10-25%, slider control — 100% client-side. 100% serverless.
Triangle Calculator — Sides, Angles, Area & Perimeter
Free triangle calculator to find sides, angles, area, and perimeter using SSS and SAS. Classifies triangle type — 100% client-side. 100% serverless.
Unit Converter — All Categories
Free, private, serverless unit converter covering 8 categories: Length, Weight, Temperature, Area, Volume, Speed, Data, and Time. Convert between hundreds of unit pairs instantly. Includes swap, all-conversions view, and real-time updates. No data leaves your browser — 100% client-side.
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