Free Online Calculators
Accurate, fast, and free calculator tools for finance, health, education, and everyday math — no signups, no popups, no ads blocking your results.
Welcome to the BSM Sites calculator library. Every calculator on this page is built from scratch using industry-standard formulas, verified against trusted sources, and tested on mobile, tablet, and desktop. Whether you’re planning a home purchase, comparing loan offers, tracking your health metrics, or solving a math problem — you’ll find a clean, fast, and accurate tool here.
Unlike most calculator websites, we don’t bury results under banner ads, force you to register, or hide premium features behind paywalls. Every tool is fully free to use, works instantly, and shows you the formula behind the calculation so you understand the result — not just the number.
Finance Calculators
Finance Calculators
Plan smarter with calculators built for real financial decisions — mortgages, loans, investments, and savings. All calculations include detailed breakdowns and downloadable schedules where applicable.
Mortgage Calculator
Estimate your monthly home loan payment with a full amortization breakdown. Supports U.S. 30-year and 15-year fixed loans plus custom terms.
Mortgage Payment Calculator
Calculate your exact monthly mortgage payment, principal, interest, property taxes, and insurance with a full amortization schedule.
Loan EMI Calculator
Calculate the monthly EMI on any loan, personal, car, education, or business. Enter your amount, rate, and term to see your payment instantly. Supports 20+ currencies worldwide.
Compound Interest Calculator
Calculate compound interest on savings, investments, and loans. See how your money grows over time with daily, monthly, or yearly compounding. Supports 150+ currencies worldwide.
Debt Payoff Calculator
Pay off credit cards, loans & debt faster. Compare Avalanche vs Snowball strategies, see your debt-free date, and find out exactly how much interest you'll save.
Retirement Calculator
Find out exactly how much you need to retire comfortably. Calculate your retirement savings goal, monthly contribution needed, and projected nest egg.
Paycheck Calculator
Calculate your exact take-home pay after taxes in seconds. Supports salary & hourly workers, all pay frequencies, pre-tax deductions
Percentage Calculator
Calculate any percentage instantly. Find what is X% of Y, X is what percent of Y, percentage increase, decrease, difference, or change
Tip Calculator
Calculate tips instantly, split the bill between any number of people, and choose from 25+ currencies. Perfect for restaurants, taxis, delivery, hotels, and salons — worldwide.
Health & Fitness Calculators
Track your health metrics with calculators using formulas from peer-reviewed medical and fitness research. Note: these tools provide general estimates and should not replace medical advice.
BMI Calculator
Calculate your Body Mass Index (BMI) instantly in metric or imperial units. Free, accurate, and worldwide
Calorie Calculator
Calculate your daily calorie needs, BMR, TDEE and macros for weight loss, maintenance or muscle gain.
TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) and BMR instantly. Find your exact maintenance, weight loss, and weight gain calorie targets
Pregnancy Due Date Calculator
Estimate your baby's due date, current pregnancy week, trimester, and key milestones. Calculate by last menstrual period (LMP), conception date, ultrasound, or IVF transfer date. Works worldwide.
Ovulation Calculator
Predict your ovulation day, fertile window, and next period in seconds. See a color-coded calendar of your most fertile days over the next 6 cycles.
Education Calculators
Advanced education calculators to simplify academic calculations like GPA, percentages, grades, and study planning.
Get accurate results instantly to track performance, improve scores, and stay on top of your academic goals.
GPA Calculator
Calculate your Grade Point Average (GPA) for high school, college, or university. Supports 4.0, 4.3, 5.0, 10.0 (CGPA India), and percentage grading scales used worldwide.
Game Calculators
Specialized calculators for popular games. Built and verified by players, updated when game mechanics change.
Palworld Breeding Calculator
Select two Pals to instantly predict their offspring — including all possible passives and traits. Plan your perfect breeding chain.
Everyday Tools
Smart everyday tools to simplify daily calculations, conversions, and quick problem-solving with speed and accuracy.
From unit converters to practical utilities, get instant results designed for convenience and efficiency.
Age Calculator
Find your exact age from your date of birth in years, months, weeks, days, hours, minutes, and seconds.
Every calculator shows the exact formula it uses. Mortgage calculations follow industry-standard amortization formulas. Health calculators use peer-reviewed research equations. Tax calculators use current published rates.
You shouldn’t need an account to calculate a percentage. Every tool works instantly the moment the page loads.
Real responsive design, not a desktop site squeezed onto a phone screen. Tested on iPhone, Android, iPad, and desktop browsers.
Every calculator includes the formula, examples of how the calculation works, and answers to common questions about the topic.
We don’t store your inputs. We don’t track what you calculate. Your data stays in your browser.
BSM Sites is a WordPress development agency. We build these tools to showcase what custom WordPress development looks like — and we keep them maintained because we use them in client work too.
We build custom calculator tools, quote generators, and interactive widgets as part of our WordPress development services — the same way we build the free ones on this page. If you need a custom tool for your website, tell us what you need and we’ll send a fixed-price quote within 48 hours.
BSM Sites maintains one of the most accessible free online calculator libraries on the web. Every tool is built using industry-standard formulas, tested across devices, and updated regularly. Our finance calculators (mortgage, loan EMI, compound interest, retirement) help with real financial decisions. Our health calculators (BMI, TDEE, calorie tracking) use peer-reviewed research formulas. Our education calculators (GPA, grade calculator) support both U.S. and international grading systems. And our specialty calculators (Palworld breeding, gaming tools) serve communities the big calculator sites ignore.
The library is built and maintained by BSM Sites, a WordPress development agency that creates custom calculator tools and interactive widgets for client websites. Every calculator on this page is also a working example of what we can build for your business. If you need a custom calculator, quote tool, or interactive widget for your site, get in touch — most projects are quoted within 48 hours.