47 free tools
Free Online Calculators for Finance, Health, Math, Conversions & More
Every calculator is free, easy to use, and gives instant results — computed right in your browser with the formula, a worked example, and a clear breakdown on every page.
- 47
- Free calculators
- 4
- Categories
- 100%
- Mobile friendly
- 0
- Sign-ups required
Handpicked
Featured calculators
The tools our visitors reach for first — accurate, fast, and documented.
Mortgage Calculator
Monthly payment, interest, and total loan cost.
Open calculatorCompound Interest Calculator
Watch compounding grow a balance over time.
Open calculatorBMI Calculator
Body mass index with category and healthy range.
Open calculatorPercentage Calculator
Percent of, percent change, and “what percent”.
Open calculatorScientific Calculator
Full expression keypad with functions.
Open calculatorCurrency Converter
Major world currencies, illustrative rates.
Open calculatorBrowse by topic
Calculator categories
Four focused collections, each built for depth — pick a lane or search across everything.
Financial Calculators
Plan loans, mortgages, savings, investments, and retirement with accurate payment, interest, and growth calculations.
15 calculatorsHealth & Fitness Calculators
Estimate BMI, body fat, calories, macros, pregnancy dates, and training heart-rate zones with clear, informational results.
11 calculatorsMath Calculators
Solve percentages, fractions, ratios, statistics, exponents, roots, and geometry problems step by step.
11 calculatorsConversion Calculators
Convert length, weight, temperature, area, volume, speed, time, energy, currency, and data storage between common units.
10 calculatorsMost used
Popular calculators
The calculators our visitors open most often.
Mortgage Calculator
Open calculatorLoan Calculator
Open calculatorCompound Interest Calculator
Open calculatorRetirement Calculator
Open calculatorCredit Card Payoff Calculator
Open calculatorBMI Calculator
Open calculatorCalorie Calculator
Open calculatorPregnancy Calculator
Open calculatorPercentage Calculator
Open calculatorFraction Calculator
Open calculatorLength Converter
Open calculatorWeight Converter
Open calculatorTemperature Converter
Open calculatorFresh off the bench
Recently added
New tools ship regularly — here are the latest six.
Scientific Calculator
Full expression keypad with functions.
Open calculatorCurrency Converter
Major world currencies, illustrative rates.
Open calculatorPercentage Calculator
Percent of, percent change, and “what percent”.
Open calculatorCompound Interest Calculator
Watch compounding grow a balance over time.
Open calculatorLength Converter
Meters, feet, inches, miles, and more.
Open calculatorBMI Calculator
Body mass index with category and healthy range.
Open calculatorLearn the math
Guides & articles
Short, practical reads that explain the formulas behind the numbers.
Financial guide3 min read
How Mortgage Payments Work: A Worked Example
Follow one payment from interest to principal, compare loan terms fairly, and understand what this calculator leaves out.
Health guide3 min read
Calories, Resting Energy, and Macros: Reading an Estimate
Understand the assumptions behind resting-energy and activity estimates, follow the arithmetic, and see why a result is not a personal eating plan.
Math guide3 min read
Percentages in Everyday Life: Six Worked Examples
Calculate a discount, compare changes, reverse an increase, and distinguish percentage points from relative percentages.
Good to know
Frequently asked questions
Are the calculators on Ghreeb Calculator really free?
Yes. Every calculator on Ghreeb Calculator is completely free to use, with no account, sign-up, or download required. Calculations run instantly in your browser.
How accurate are the results?
Each tool uses standard, published formulas — for example the amortization formula for loans and the Mifflin-St Jeor equation for calorie estimates. Results are estimates intended for planning and education; for financial, medical, or legal decisions, confirm figures with a qualified professional.
Is my data stored or sent anywhere?
No. All calculations happen locally in your browser. The numbers you enter are never transmitted to a server or saved by us.
Do the calculators work on phones and tablets?
Yes. Every calculator is fully responsive and touch-friendly, so you can calculate on any device — phone, tablet, or desktop.
Does the Currency Converter use live exchange rates?
No. The Currency Converter uses fixed illustrative rates that are updated periodically, not live market data. Always check your bank or a live rate provider before making real transactions.
Can I suggest a new calculator?
Absolutely. We add new tools regularly — visit the Contact page and tell us which calculator you would like to see next.
Stop guessing. Start calculating.
47 free tools across finance, health, math, and conversion — every one instant, documented, and sign-up free.
Browse all calculators