Every calculation you need, in one place.
Search by category, browse by topic, or jump straight to a calculation. From mortgage payments to BMI, investment returns to unit conversions.
Categories
Why Us
✓Instant results, no loading
✓Mobile-friendly responsive design
✓Professional-grade formulas
✓100% free, no account needed
Trending
Estimate your monthly mortgage payment based on home price, down payment, loan term, and interest rate. View a detailed amortization breakdown showing how each payment splits between principal and interest over the life of the loan.
Calculate your Body Mass Index (BMI) to determine if you're at a healthy weight based on your height and weight.
Plan your retirement by calculating how much you need to save based on your desired retirement age, lifestyle, and current savings.
Track your pregnancy progress week by week with trimester information and key milestone dates based on your due date.
Calculate gross profit margin, net profit margin, and markup percentage to understand your business profitability.
Estimate your federal income tax liability based on your income, filing status, deductions, and credits for the current tax year.
Convert your salary between different pay periods including annual, monthly, biweekly, weekly, daily, and hourly rates.
Calculate any percentage operation: find a percentage of a number, determine percentage change, or solve for the whole from a part.
12 categories · 255+ free calculators
33 calculators
25 calculators
23 calculators
18 calculators
23 calculators
18 calculators
16 calculators
22 calculators
23 calculators
16 calculators
20 calculators
18 calculators
Biggest Calculator Hub provides over 255 free online calculators across 12 categories including finance, health, math, conversions, and more. Every calculator delivers instant, accurate results with clear explanations.
Whether you're planning a mortgage, tracking fitness goals, converting units, or calculating business metrics — Biggest Calculator Hub has the right tool. All calculators are mobile-friendly, require no sign-up, and work instantly in your browser.