Free Online Calculators
Fast, accurate, and easy-to-use calculators for everyday math. No signup required — just calculate.
Pregnancy Calculator
Calculate your due date, current pregnancy week, trimester, and important milestones throughout your journey.
Age Calculator
Calculate your exact age in years, months, days, hours, and minutes. Find out how many days until your next birthday.
Tip Calculator
Calculate the tip amount and total bill. Split the bill between multiple people with custom tip percentages.
Date Calculator
Calculate the number of days between two dates. Add or subtract days from any date to find a new date.
Percentage Calculator
Calculate percentages easily. Find what percent one number is of another, increase/decrease by percentage, and more.
Tariff Calculator
Calculate US import tariffs, duties, and total landed costs. Estimate how tariffs affect the price of imported goods.
Mortgage Calculator
Calculate monthly mortgage payments, total interest, and view amortization schedules. Includes property tax, insurance, and PMI.
Tax Calculator
Estimate your federal income tax, FICA taxes, state tax, effective rate, and take-home pay with 2025 tax brackets.
Why Use Calcify?
Lightning Fast
Instant results as you type. No waiting, no page reloads.
Accurate Results
Precise calculations you can trust for important decisions.
Works Everywhere
Mobile-friendly design. Use on any device, anywhere.
About Calcify
Calcify is a free collection of online calculators designed for everyday use. Whether you're calculating a pregnancy due date, splitting a dinner bill, figuring out your age in days, or estimating mortgage payments — Calcify gives you instant, accurate results without any sign-up or software installation.
All calculations run directly in your browser. No personal data is collected, no information is sent to any server. Just open the calculator you need, enter your numbers, and get your answer. It's that simple.
Each calculator is built with real-world use cases in mind. The tax calculator uses current 2025 federal brackets and all 50 state rates. The tariff calculator reflects the latest Section 232 rates. The mortgage calculator includes property tax and insurance estimates. Accuracy matters when real money is involved.
Frequently Asked Questions
Are the calculators accurate?
Yes. Our calculators use current, verified data sources. Tax brackets are based on IRS 2025 figures, tariff rates come from the Tax Foundation, and all mathematical formulas follow standard financial and scientific methods.
Is Calcify really free?
Completely free. No premium plans, no feature restrictions, no account required. Every calculator is available to everyone, always.
Do you store my data?
No. All calculations happen in your browser. Nothing is sent to any server — your inputs and results stay entirely on your device.