Free Online Calculators
Every calculation, made easy — fast, accurate tools for money, health and everyday life. No signup, no clutter, just answers backed by cited formulas from trusted sources.
Why BreezyCalc
Built to be the fastest, clearest calculator you'll use today.
Instant, no signup
Every calculator runs the moment you type — no account, no email capture, no waiting. Just the number you came for.
Formulas you can check
Each tool cites its source, whether that's the standard amortization formula, IRS/gov.uk tax bands, or the Mifflin-St Jeor equation used by dietitians.
US & UK aware
Finance tools understand both dollars and pounds, and the take-home pay calculator auto-detects your region so you never have to pick a country.
Nothing stored
Calculations happen entirely in your browser. We don't save what you type, and we never ask for personal or financial account details.
Works everywhere
Clean, responsive design that works as well on a phone in a store aisle as it does on a desktop planning a mortgage.
Guides, not just numbers
Every calculator links to an in-depth guide on our blog explaining the "why" behind the number, not just the result.
How it works
Three steps, zero friction.
Pick a calculator
Browse by category below or search by name — mortgage, BMI, tip and more.
Enter your numbers
Fill in a few simple fields. No jargon, no unnecessary questions.
Get your answer
See results instantly, often with a visual breakdown so the number actually makes sense.
Finance calculators
Plan your money with confidence — mortgages, salaries, loans and savings. These tools use the same formulas banks and payroll systems rely on.
Mortgage calculator
Monthly payment, total interest and full amortization.
Take-home pay
US & UK salary after tax, per month and per week.
Loan calculator
Car and personal loan payments with interest breakdown.
Compound interest
See how your savings grow over time with compounding.
Retirement calculator
Project your 401(k) and IRA savings growth to retirement.
Investment calculator
Project your portfolio growth with compound returns.
Budget calculator
Split your income with the 50/30/20 budget rule.
Hourly to salary
Convert your hourly wage to annual, monthly and weekly pay.
Overtime calculator
Calculate overtime pay at time-and-a-half or double time.
VAT calculator
Add or remove UK VAT at 20% from any price.
Sales tax calculator
Calculate total price after US state sales tax.
Stamp duty calculator
Calculate UK Stamp Duty Land Tax for 2026/27.
Roth IRA calculator
Project tax-free growth on your Roth IRA contributions.
Capital gains tax calculator
Estimate short-term and long-term capital gains tax.
College cost calculator
Project 4-year college cost and your savings gap.
Health calculators
Understand your body using formulas cited by health bodies like WHO, CDC, NHS and ACOG rather than guesswork.
BMI calculator
Body mass index with healthy weight range guide.
Calorie calculator
Daily calories to maintain, lose or gain weight.
Due date calculator
Estimate your pregnancy due date week by week.
Macro calculator
Daily protein, carbs and fat targets for your goals.
Ideal weight calculator
Healthy weight range for your height, men and women.
Body fat calculator
Estimate body fat percentage using the US Navy method.
Sleep calculator
Find the best bedtime or wake-up time by sleep cycle.
Ovulation calculator
Estimate your fertile window and next period date.
Conception calculator
Estimate your likely conception date.
Pregnancy weight gain
Healthy weight gain range based on your BMI.
Everyday calculators
Quick answers for daily life — splitting a bill, checking a discount, or working out someone's exact age.
Percentage calculator
Percentages, increases, decreases and differences.
Age calculator
Exact age in years, months and days from birth date.
Tip calculator
Tip amount and split the bill between friends.
GPA calculator
Calculate your cumulative GPA from grades and credits.
Discount calculator
Calculate sale price and savings after a discount.
Fuel cost calculator
Estimate fuel cost for any road trip.
Date calculator
Days between two dates, or add/subtract days.
Time calculator
Time duration between two times, or add/subtract time.
Grade calculator
Weighted final grade from category scores.
Currency converter
Convert between currencies using reference rates.
Shipping calculator
Estimate shipping cost from weight and size.
Electricity cost calculator
Estimate appliance running cost from wattage.
Probability calculator
Single-event and combined event probability.
Unit conversion calculator
Convert length, weight and temperature units.
Why is BreezyCalc free?
BreezyCalc is supported by advertising, not subscriptions or your personal data. We don't require an account, we don't sell your information, and we never lock results behind a paywall.
Ads let us keep every calculator free, fast and available to anyone who needs a quick, reliable answer — that's the whole business model, and we think it's a fair trade.
Frequently asked questions
Common questions about using BreezyCalc.