Make confident
financial decisions
with precision tools
A premium library of 32+ interactive calculators and in-depth guides covering mortgages, business loans, insurance, taxes, immigration, and personal finance—engineered for accuracy and clarity.
Browse by financial category
Eight specialized domains, each with carefully crafted calculators and educational guides.
Real Estate
Mortgage, home value, refinance, and rental property calculators to help you make confident property decisions.
Business
Loan affordability, profit margin, break-even, valuation, and cash flow tools built for small business owners.
Personal Finance
Loan EMI, retirement, savings, compound interest, and net worth calculators for smarter money management.
Insurance
Life, auto, health, and disability insurance calculators to right-size your coverage with confidence.
Immigration
Visa and citizenship eligibility pre-screeners to help you understand your options before you apply.
Tax
Income tax, sales tax, and capital gains calculators to estimate liabilities and plan ahead.
Health
BMI, BMR, TDEE, and macro calculators to support informed health and fitness decisions.
Investment
Investment return, dividend yield, and compound growth calculators for portfolio planning.
Most popular calculators
Start with the tools thousands of users reach for first.
Home Worth Estimator
Get a data-driven estimate of your home's current market value based on location, size, condition, and recent comparables.
Mortgage Pre-Qualifier
Find out how much house you can afford based on your income, debts, down payment, and current interest rates.
Small Business Loan Affordability Calculator
Determine how much business loan you can afford based on your revenue, expenses, and cash flow.
Visa Eligibility Pre-Screener
Quickly check which US visa categories you may be eligible for based on your profile.
Life Insurance Needs Calculator
Calculate how much life insurance coverage your family would need to maintain their lifestyle.
Compound Interest Calculator
See how compound interest grows your money over time with regular contributions.
Built for clarity,
engineered for trust
Every calculator on 1gb.icu follows a single principle: give you a transparent, accurate, and genuinely useful answer—without upsells, signup walls, or hidden assumptions.
Transparent methodology
Every formula and assumption is documented in plain English. No black boxes—see exactly how each number is calculated and why.
No signup, no paywall
Every calculator and every guide is 100% free. No account required, no email gate, no premium tier. Just open and use.
Real educational depth
Each tool comes with detailed explainers, real-world examples, glossary terms, and a full FAQ. You leave understanding the topic, not just the number.
Mobile-first, lightning fast
Our calculators run entirely in your browser—no servers, no waiting. They work offline once loaded and feel instant on any device.
Learn before you calculate
Deep-dive guides that explain the why behind every number.
How to Estimate Your Home's Worth in 2024
A complete walkthrough of the methods, data sources, and pitfalls involved in estimating your home's current market value.
Mortgage Pre-Qualification vs Pre-Approval: What's the Difference?
These two mortgage terms are often confused but mean very different things for your homebuying power.
When Does Refinancing Your Mortgage Make Sense?
Refinancing can save you thousands—or cost you. Here's how to run the numbers and decide.
Renting vs Buying a Home: A Complete Financial Breakdown
Beyond the "rent is throwing money away" cliché—a real financial comparison with all the variables.
Understanding Rental Property ROI: A Beginner's Guide
Cap rate, cash-on-cash return, IRR—demystifying the metrics that real estate investors live by.
How Much Business Loan Can You Afford?
DSCR, debt-to-income, and cash flow—how lenders decide what your business can borrow.
How we build every calculator
A consistent, transparent process you can verify for yourself.
Research the standard
We start with the official formula—whether it's IRS tax brackets, Fannie Mae DTI rules, or the Mifflin-St Jeor equation for BMR. No reinventing the wheel.
Build transparently
Every input, assumption, and intermediate step is shown to you. The formula is documented in plain English alongside the result.
Explain the result
Numbers without context mislead. Every calculator includes a "How it works" section, a worked example, a glossary, and answers to common questions.