Free online calculators, with the formula shown
From BMI and loan payments to grams-to-tola and hectare-to-bigha: get an instant answer, then see how it was worked out. Nothing to install and no account needed.
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Find the right calculator, fast
7 collections, 224 calculators in total. Each category page lists every tool in it.
Health Calculators
BMI, calories, sleep, fitness and body measurements.
Explore 51 toolsFinance Calculators
Loans, tax, savings, retirement and investment returns.
Explore 83 toolsEveryday Tools
Dates, costs, home projects, text tools and daily maths.
Explore 23 toolsMath Calculators
Percentages, fractions, grades, GPA and algebra.
Explore 23 toolsBusiness Calculators
Break-even, margins, ROI, pricing and valuation.
Explore 12 toolsConversion Calculators
Area, land, temperature, weight and unit converters.
Explore 8 toolsSocial Media Calculators
Creator earnings, engagement rates and per-post pricing.
ExploreAll calculators
The complete A–Z list of every tool and page on the site.
View listPopular calculators
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Gram to Tola Converter: Free Gold Weight Calculator (2026)
Convert gram to tola for gold instantly. 10 g = 0.8574 tola, 50 g = 4.2868 tola, 100 g = 8.5735 tol…
Conversion -
Case Converter – Small to Capital & Capital to Small (Free Online)
Free case converter: small letters to CAPITAL and capital to small in one click, plus Title Case, S…
Everyday Tools -
Hectare to Bigha Calculator
Use our free Hectare to Bigha Calculator to instantly convert land area. Know how many Bigha in 1 H…
Conversion -
Final Grade Calculator — What Score Do I Need to Pass? (2026)
Free final grade calculator: enter your current grade, target grade and exam weight to see the exac…
Math -
Text Repeater – Repeat Text 10, 100, 1000 Times Online (Free)
Free text repeater: repeat any word, sentence or emoji 10, 100 or 1000 times instantly with new lin…
Everyday Tools -
Ethanol Dilution Calculator – Mix Ethanol to Any Concentration
Use our free Ethanol Dilution Calculator to find the exact amount of ethanol and water needed to re…
Math -
Electric Heater Running Cost Calculator (UK & US 2026) – Cost Per Hour
Free electric heater running cost calculator. Find out exactly what your space heater or fan heater…
Everyday Tools -
Celsius to Fahrenheit | °C to °F
Celsius to Fahrenheit calculator 2026: convert any temperature instantly with the exact formula, fr…
Conversion -
Percentage Calculator
Use our free Percentage Calculator to easily find basic percentages, percentage changes, and what p…
Math -
Square Footage Calculator
Free Square Footage Calculator to quickly calculate room, house, or flooring area in square feet. E…
Conversion
Newly added
The latest calculators published on CalculatorSphere.
- Compost C:N Ratio Calculator – Balance Browns and Greens (2026)Everyday Tools · Added Aug 4, 2026
- KDP Royalty Calculator – Kindle Ebook and Paperback Royalties (2026)Business · Added Aug 4, 2026
- Print-on-Demand Profit Calculator – True Margin After All Fees (2026)Business · Added Aug 4, 2026
- Patreon Earnings Calculator – Estimate Your Real Net Payout (2026)Business · Added Aug 4, 2026
- Yarn Calculator – How Much Yarn Do I Need? (Knitting & Crochet)Everyday Tools · Added Aug 4, 2026
- Backyard Chicken Feed Calculator – Cost and Amount Needed (2026)Everyday Tools · Added Aug 4, 2026
- Soap Making Lye Calculator – NaOH and Water Amounts (2026)Everyday Tools · Added Aug 4, 2026
- Candle Making Cost Calculator – Price Your Candles Right (2026)Everyday Tools · Added Aug 4, 2026
Simple tools you can check
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Calculators run in your browser, so the answer appears straight away, without page reloads.
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The figures you type into a calculator are not sent to our servers. Our privacy policy covers the analytics and ads the site uses.
Formula and worked example
Most pages explain the formula behind the result with a worked example, so you can follow the maths.
Works on any screen
Layouts adapt to phones, tablets and desktops. Nothing to download or install.
Frequently asked questions
Everything you need to know about using CalculatorSphere.
Are all calculators on CalculatorSphere free to use?
Yes. All 224 calculators on CalculatorSphere are free to use, with no sign-up, no premium tier and no paywall. The site is supported by advertising.
Do I need to create an account or sign up?
No. You can use every calculator straight away without creating an account, logging in or giving us your email address.
How accurate are the calculators?
Each calculator uses the standard formula for its topic, and most pages explain that formula with a worked example so you can check the maths yourself. Results are estimates for planning and education, so confirm important figures with a qualified professional.
Is my personal data stored or tracked?
The calculators run in your browser, so the numbers you type into them are not sent to our servers or stored by us. Like most free websites, CalculatorSphere uses analytics and advertising services that set cookies; our Privacy Policy explains what they collect. A few language tools (such as the Hinglish translator and Hindi typing tool) send the text you enter to a third-party translation service in order to work.
Which are the most popular calculators on the site?
Some of our most-used tools are the Gram to Tola Converter: Free Gold Weight Calculator (2026), Case Converter – Small to Capital & Capital to Small (Free Online), Hectare to Bigha Calculator, Final Grade Calculator — What Score Do I Need to Pass? (2026), Text Repeater – Repeat Text 10, 100, 1000 Times Online (Free). You can find more in the Popular calculators section on this page.
Do the calculators work on mobile phones and tablets?
Yes. The site and its calculators are built to work on phones, tablets and desktop browsers. There is no app to download.
What categories of calculators are available?
CalculatorSphere currently has 7 categories: Health (24), Finance (51), Everyday Tools (83), Math (23), Business (23), Conversion (12), Social Media (8).
How often are new calculators added?
We add new calculators over time. The most recent additions are the Compost C:N Ratio Calculator – Balance Browns and Greens (2026), KDP Royalty Calculator – Kindle Ebook and Paperback Royalties (2026), Print-on-Demand Profit Calculator – True Margin After All Fees (2026). The Newly added section on this page always shows the latest ones.
Can I suggest a calculator that is not yet on the site?
Yes. Send your idea through our Contact page and tell us what you would like to calculate.
Are the finance calculators suitable for professional financial advice?
No. Our finance tools are designed for personal planning and education. They give estimates based on standard formulas, but they do not replace advice from a licensed financial adviser for major decisions.
Understand the maths, not just the number.
Plain-English guides and worked examples for loans, tax, health metrics, home projects and conversions.