Mortgage
Estimate your monthly mortgage payment with property tax, insurance, PMI, and HOA folded in. Built for the US 30-year and 15-year fixed.
66 Fast,Lite, accurate /+ calculators.
For the everyday math that runs life — money, school, health and home — plus tools for designers, developers and writers.
Financial Calculators (16 tools)
Mortgages, loans, debt, retirement and investing
Refinance
See your refinance break-even point and total interest saved over the new loan term.
Car Loan
Estimate monthly auto loan payments, total interest paid, and how down payment changes the math.
Personal Loan
Monthly payment, total interest, and full amortization schedule for any personal loan amount and term.
Credit Card Payoff
See how long it will take to clear your card and how much interest you will pay along the way.
401(k)
Project your 401(k) balance at retirement with contributions, employer match, and realistic market returns.
Roth IRA
Project tax-free Roth IRA growth based on contributions, expected returns, and years to retirement.
Debt-to-Income
Calculate your DTI ratio — the number lenders use to decide whether to approve a mortgage or loan.
Compound Interest
See how money grows over time with compounding. Adjust contributions, rate, and frequency.
Retirement
How much you need to retire — based on your spending, expected returns, Social Security, and timeline.
College Savings
Plan for college costs with inflation-adjusted projections. Built around 529 plan assumptions.
Student Loan Payoff
Compare payoff strategies — avalanche vs snowball — and find your real interest cost.
Loan & EMI
Monthly payment, total interest, and amortization schedule for any loan worldwide.
SIP Calculator
Calculate SIP returns, total corpus, and wealth gained for any monthly investment and return rate.
ROI
Calculate return on investment, annualized ROI, net profit, and payback period.
Salary & Take-Home Pay
Calculate US net paycheck after federal, FICA, and state tax. Supports salary and hourly.
Education Calculators (13 tools)
Tools for students: GPA, grades, test scores and attendance
GPA
Calculate your semester GPA on a 4.0 scale with letter grades and credit hours.
Weighted GPA
Calculate weighted GPA on the 5.0 scale that gives extra points for AP and Honors classes.
Final Grade
What you need on the final exam to hit your target grade in the course.
Class Rank
Estimate your class rank percentile from your GPA and class size.
SAT Score
Convert raw SAT scores to scaled scores and compare against national percentile benchmarks.
ACT Score
Convert ACT raw scores to scaled and composite scores with national percentile comparisons.
Grade
Calculate your overall course grade from individual assignments, quizzes, and exams.
Study Hours
How many hours of study you need based on credit hours and course difficulty.
Percentage
Find what % one number is of another, % change, and % difference. Four modes.
Attendance
Track attendance %, find how many classes you can miss or must attend to hit your target.
IELTS to TOEFL
Convert IELTS Academic band scores to TOEFL iBT scores using the official ETS concordance table.
ACT Composite Score
Calculate ACT composite from section scores with percentile rank, benchmarks, and superscore calculator.
GMAT Score
Calculate GMAT total score from Verbal and Quantitative scaled scores with business school ranges.
Health Calculators (8 tools)
Body composition, calories, macros and pregnancy
BMI
Body Mass Index with CDC categories and healthy weight range for your height in feet/inches and pounds.
BMR
Calculate Basal Metabolic Rate and TDEE using Mifflin-St Jeor. Imperial and metric.
Calorie / TDEE
Daily calorie needs using the Mifflin-St Jeor equation, adjusted for activity level and goal.
Body Fat
Estimate body fat percentage using the U.S. Navy method or BMI-based approximation.
Due Date
Pregnancy due date and full timeline of milestones based on last menstrual period.
Ovulation
Estimate your ovulation date, fertile window, and next three predicted periods from your cycle.
Macro
Daily calorie target plus protein, carb, and fat grams for a balanced, low-carb, or high-protein split.
Ideal Weight
Estimated ideal body weight from four medical formulas, plus your CDC healthy BMI range.
Everyday Calculators (7 tools)
Dates, time zones, currency, units and shopping maths
Age
Calculate exact age in years, months, weeks, days, and hours between any two dates.
Time Zone
Convert time between any two US or world time zones. Daylight saving handled automatically.
Currency Converter
Convert US dollars to any world currency with live exchange rates. Supports 25+ currencies.
Unit Converter
Convert length, weight, temperature, volume, area, speed, and data between US and metric units.
Tip
Calculate tip amount, total bill, and per-person split for any group size.
Discount
Percent off, stacked discounts, and sales tax — see your sale price and total savings instantly.
Date
Days between two dates, or add and subtract days from a date to find the result and day of week.
Home & Construction Calculators (9 tools)
Materials and quantities for your next project
Square Footage
Rooms, walls, decks, or lots. Square feet, yards, meters, and acres with waste factor and cost.
Paint
Gallons for a room, with door and window deductions, multiple coats, ceiling, and primer.
Concrete
Cubic yards and bag counts for slabs, footings, and columns. Tells you when ready-mix wins.
Flooring
Boxes needed with waste factor, leftover square footage, and what you actually pay.
Tile
Tile count, boxes, and grout for any size. Joint width, thickness, sanded vs unsanded.
Mulch
Cubic yards and bags for mulch, topsoil, or compost — with bags vs bulk cost comparison.
Gravel
Tons and cubic yards for crushed stone, pea gravel, river rock, sand, or DG.
Roofing
Squares, bundles, and underlayment from footprint and pitch, with the pitch multiplier applied.
Drywall
Sheets in 4×8, 4×10, or 4×12, plus joint compound, tape, and screws.
Design Tools (4 tools)
Tools for designers: color, contrast and layout maths
Color Contrast Checker
Check text and background colors against WCAG AA and AAA, and get the nearest passing shade.
Hex to RGB
Convert hex color codes to RGB, HSL, HSB with live preview and WCAG contrast.
PX to REM
Convert pixels to rem and back at any root font size, with copy-ready CSS.
Aspect Ratio
Find the ratio of any dimensions and resize images or video without distortion.
Developer Tools (7 tools)
Tools for developers: encode, format, generate and convert
Binary to Decimal
Convert between binary, decimal, hex, and octal instantly.
Unix Timestamp
Convert Unix timestamps to dates and back. Supports seconds, ms, and time zones.
Password Generator
Generate strong, cryptographically random passwords with custom length and character sets.
JSON Formatter
Beautify, minify, and validate JSON instantly, with clear error messages for syntax problems.
QR Code Generator
QR codes for links, WiFi, vCards, locations and social profiles, with custom shapes. PNG or SVG.
UUID Generator
Generate random v4 UUIDs in bulk, with uppercase, no-hyphens, and braces formatting options.
Base64 Encoder / Decoder
Convert text to Base64 or decode it back, with full Unicode support and URL-safe encoding.
Writing Tools (2 tools)
Tools for writers: word counts, reading time and text case
Word & Character Counter
Count words, characters, sentences, and reading time. Live social media limits.
Case Converter
Convert text to Title Case, sentence case, UPPERCASE, camelCase, snake_case and more.