Free Online Calculator: What You Can Calculate
This free online calculator runs five calculators in one page: basic arithmetic, a scientific calculator, a unit converter, a loan payment calculator and a BMI calculator. Everything runs in your browser, so nothing is uploaded and no signup is needed. Type an expression such as 12 x (3 + 4) and the answer appears immediately; switch to Scientific for sin, cos, tan, log, sqrt, powers, pi and e; switch to Units to convert between metric and imperial; switch to Loan for the monthly payment, total payment and total interest in USD; switch to BMI for body mass index with the standard health ranges.
| Calculator | What it calculates | Example |
|---|---|---|
| Basic | Addition, subtraction, multiplication, division, percentages and sign change | 1,250 x 0.08 = 100 |
| Scientific | Trigonometry, logarithms, roots, powers, pi and e | sin(30) = 0.5 |
| Unit Converter | Length, weight, temperature, area, volume, speed, time and data storage | 12 km = 7.46 mi |
| Loan | Monthly payment, total payment and total interest, in USD | 300,000 USD at 6.5% for 30 years = 1,896.20 USD a month |
| BMI | Body mass index and its health range, metric or imperial | 70 kg at 1.75 m = 22.9 |
How to Use the Free Online Calculator
Unlike basic phone calculators, this tool solves real-world problems developers, students, and professionals face daily. Whether you need quick arithmetic or complex financial calculations, our calculator provides instant, accurate results without installing software or creating an account.
Calculator Features
Basic Calculator: Four fundamental operations for quick everyday math. The interface mirrors standard physical calculators so you feel at home immediately.
Scientific Calculator: Includes trigonometric functions (sin, cos, tan), logarithms (log), square root (sqrt), and constants (pi, e). Essential for students, engineers, and anyone working with advanced mathematics.
Unit Converter: Convert between different units without looking up conversion formulas. Supports length, weight, temperature, area, volume, speed, time, and data storage.
Area of a Shape: Need the area of a circle, triangle, rectangle, or sector? Use our dedicated Area Calculator for every shape, plus L-shaped rooms, wall area with door and window subtraction, and paint and wallpaper estimates.
Loan Calculator: Before taking a loan, know your exact monthly payment. Enter the loan amount, interest rate, and term to see the total interest paid and complete payment breakdown.
BMI Calculator: Calculate your Body Mass Index using standard metric or imperial measurements. Understand whether you're underweight, normal weight, overweight, or obese.
Who Uses This Calculator?
Developers: Verify arithmetic in code, convert units for international projects, calculate data storage requirements.
Students: Check homework, work through science problems with scientific functions, understand body mass index for health classes.
Home Buyers: Calculate actual loan costs before committing to a mortgage. Compare different loan offers by interest rate and term.
Professionals: Quick calculations during meetings without switching to spreadsheet software.
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