Fast, accurate calculators for finance, business, health, education, engineering, dates, units, and everyday math.
Basic Calculator
Perform arithmetic calculations online — addition, subtraction, multiplication, division, and more.
Scientific Calculator
Advanced scientific calculator with powers, roots, logarithms, trigonometry, and constants.
Percentage Calculator
Calculate percentages, percent change, discounts, markups, and tips instantly.
Unit Converter
Convert length, weight, volume, temperature, area, speed, time, data, and more.
Loan Calculator
Calculate monthly loan payments, total interest, and amortization schedule.
Mortgage Calculator
Estimate monthly mortgage payments including taxes, insurance, PMI, and HOA fees.
Compound Interest Calculator
Estimate investment growth with compound interest, contributions, and year-by-year breakdown.
Paycheck Calculator
Estimate take-home pay after federal taxes, Social Security, Medicare, and deductions.
BMI Calculator
Calculate Body Mass Index (BMI) using height and weight in US or metric units.
Everyday math, unit conversions, dates, and scientific calculations.
View all Everyday calculators →Loans, mortgages, compound interest, savings, and income calculators.
ROI, break-even, margin, and business planning calculators.
Electrical, statistics, construction, and technical calculators.
Professional calculators with clear formulas, accurate results, and excellent mobile experience.
Clear Formulas
Every calculator shows the formula and explains each variable.
Instant Results
Results update as you type — no page reloads.
Mobile-Friendly
Works perfectly on any device, screen size, or orientation.
Privacy-First
Calculations run in your browser. We don't collect your data.
Professional Accuracy
Precise decimal math for financial and scientific calculations.
Free Forever
No account, no subscription, no hidden fees.
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