Crunch Quick everyday math
Discount Calculator
Final price, what you save, and the total with tax — before you reach the register.
Tip Calculator
Fair tip, per-person split, rounded totals. Dinner math, done.
Unit Price Calculator
Which pack is really cheaper? Price per ounce, pound or litre, side by side.
Sales Tax Calculator
Add tax to any price, or back it out of a total.
GPA Calculator
Turn letter grades and credits into your GPA in one pass.
Word Counter
Words, characters and reading time for essays, posts and applications.
Password Generator
Strong random passwords made on your device — nothing leaves the browser.
Percentage Calculator
Six modes in one: percent of, as a %, increase, decrease, change and difference.
Fraction Calculator
Add, subtract, multiply and divide fractions with every step shown free.
Scientific Calculator
Trig, logs, powers, factorials, memory keys and a history tape.
Currency Converter
Live exchange rates for 30+ currencies, with swap and quick amounts.
Standard Deviation Calculator
Paste data or upload a CSV: mean, median, mode and standard deviation.
Random Number Generator
Random numbers (unique, sorted, decimals), coin flips and dice rolls.
Final Grade Calculator
The final-exam score you need for the grade you want — plus a what-if mode.
Body, dates & time
BMI Calculator
Body mass index from height and weight, imperial or metric.
Age Calculator
Your exact age, total days lived, and the countdown to your next birthday.
Time Duration Calculator
Hours and minutes between two times — shifts, trips, study sessions.
Date Calculator
Days between dates, add or subtract any span, and count business days.
Pregnancy Due Date Calculator
Due date from last period, conception or ultrasound — with trimester milestones.
Calorie Calculator
Daily calories for your goal, with protein, carb and fat targets.
BMR Calculator
BMR three ways — Mifflin, Harris-Benedict and Katch-McArdle — plus TDEE.
Ovulation Calculator
Fertile window and ovulation day, with a 3-cycle calendar.
Money in a hurry
Hourly to Salary Converter
What an hourly wage really pays per year — and the reverse.
Salary Raise Calculator
A raise in real terms: new salary and the per-paycheck difference.
Debt Payoff Calculator
Pick a payment and see your debt-free date and interest saved.
Credit Card Payoff Calculator
Months to clear a card balance and what the interest really costs.
Savings Goal Calculator
The monthly deposit that actually reaches your goal on time.
Compound Interest Calculator
Watch regular deposits snowball year after year.
Loan Calculator
Solve for the payment, the amount, the term or the rate on any loan.
Amortization Calculator
Every payment on a loan, month by month, with extra-payment impact.
Paycheck Calculator
Gross-to-net take-home for weekly, biweekly, semi-monthly and monthly pay.
Retirement Calculator
Year-by-year savings projection with employer match and a goal check.
Home & DIY
Paint Coverage Calculator
Gallons needed for the room, the coats and the ceiling — no second trip.
Deck Material Estimator
Boards, screws and concrete for the deck you are planning.
Moving Cost Estimator
Movers vs a DIY truck: a realistic all-in estimate.
Concrete Calculator
Cubic yards, bag counts and cost for slabs, footings, tubes, steps and curbs.
Square Footage Calculator
Area for four shapes, a rooms list and cost-per-sq-ft totals.
Work & small business
Freelance Hourly Rate Calculator
Work backwards from the income you want to the rate you must charge.
Invoice Generator
A clean, printable invoice in about a minute.
Quarterly Tax Estimator
Quarterly estimated tax for the self-employed, without the dread.
Mileage Deduction Calculator
Turn driven miles into an estimated IRS deduction.
Break-Even Calculator
Exactly how many units cover your costs.
ROI Calculator
Return on investment, plus the annualized figure.
Big purchases & property
Mortgage Payment Calculator
Monthly payment, total interest and payoff schedule for any home loan.
Car Loan Calculator
Auto payments and the true total cost of the car.
Refinance Calculator
Refi savings and the month you break even on closing costs.
Home Affordability Calculator
The most house your income can honestly carry.
Business Loan Calculator
Payments and amortization for a business loan.
Cap Rate Calculator
A rental property’s return from rent and expenses.
Cash-on-Cash Return Calculator
What your actual cash in earns each year.
Rental Property Analyzer
The full deal: cash flow, cap rate and cash-on-cash together.
Mortgage Payoff Calculator
Your debt-free date — and how extra payments pull it closer.
Rent vs Buy Calculator
Rent or buy? Total costs compared over your stay, with a break-even year.
Why Crunch Numbers?
Most calculator sites bury a simple question under forty fields and a wall of ads. Crunch Numbers is built the other way: the answer first, the explanation underneath, and every tool running entirely in your browser — nothing you type is sent anywhere. Quick when you are in a hurry, complete when you are not.