Start with free calculators. Go Pro to save projects, compare scenarios, import data, and generate professional reports.
Explore by Industry
CalcVault's mission is to provide free, accurate, and bilingual financial tools for Vietnamese and global SMB owners. Whether you are running a local cafe, a retail store, a freelance business, a construction firm, or an e-commerce operation, CalcVault is built for you.
Our calculation philosophy is simple: verified formulas from authoritative sources, and no guesswork. We believe that small business owners need reliable tools to make critical decisions. That's why our verification process involves sourcing data and formulas directly from authoritative bodies such as the IRS, CFPB, CDC, WHO, NIST, and the Ministry of Finance Vietnam.
We pride ourselves on our bilingual quality. Both English and Vietnamese versions of our calculators are maintained in parallel, ensuring that all our users receive the same high-quality experience and accurate results, regardless of the language they prefer.
Why trust a free tool? CalcVault operates on an ad-supported model that funds expert formula maintenance and ensures our editorial independence from advertisers. This means we can keep our core tools free while maintaining the highest standards of accuracy and reliability.
Expert guides to help you make better financial decisions.
Annual Percentage Rate (APR) includes fees that interest rates hide. This guide explains how to calculate APR, why it matters, and how to compare loan offers correctly.
From pre-approval to closing costs, a complete beginner's guide to understanding how mortgages work and what affects your monthly payment.
A complete guide to compound interest — the formula, the frequency effect, real examples, and how to use it to grow savings or evaluate loan costs.
BMI is widely used but widely misunderstood. This guide explains what BMI actually measures, its documented limitations, and when to supplement it with other assessments.
Find the right tool for your specific business needs.
Everyday tools for health, finances, and life.
Our most popular tools used by thousands of business owners.
Calculate your Body Mass Index (BMI) using metric (kg/cm) or imperial (lb/in) units. BMI categories: Underweight < 18.5, Normal 18.5–24.9, Overweight 25–29.9, Obese ≥ 30.
Apply the 50/30/20 budget rule to your monthly income. Split your salary into needs (50%), wants (30%), and savings or debt repayment (20%). Based on a typical Vietnamese monthly income of ~15,000,000 VND.
Calculate the annual business license tax (môn bài) for enterprises, cooperatives, and household businesses in Vietnam.
Estimate the total construction cost of a building project based on area, cost per square meter, and additional expenses.
Calculate your ideal hourly or project rate as a freelancer. Factor in expenses, taxes, and desired income to set competitive rates.
Calculate the fuel cost for any trip or monthly driving in Vietnam. Enter your distance, fuel consumption, and current petrol price to get instant results.
Sourced from IRS, CFPB, CDC, WHO, NIST, Vietnamese Ministry of Finance
Independent peer review before publishing, corrections policy in place
Every calculator links to primary sources
Calculators updated when regulations change
July 18, 2026
Annual Percentage Rate (APR) includes fees that interest rates hide. This guide explains how to calculate APR, why it matters, and how to compare loan offers correctly.
July 18, 2026
From pre-approval to closing costs, a complete beginner's guide to understanding how mortgages work and what affects your monthly payment.
July 18, 2026
A complete guide to compound interest — the formula, the frequency effect, real examples, and how to use it to grow savings or evaluate loan costs.
July 18, 2026
BMI is widely used but widely misunderstood. This guide explains what BMI actually measures, its documented limitations, and when to supplement it with other assessments.
Access all essential calculators for free. Pro unlocks unlimited history, workspaces, scenario comparison, advanced reports, and AI recommendations.
Optimized for Vietnam and global markets with bilingual support and regional financial standards.
Free users can export limited watermarked reports. Pro users get unlimited professional PDF reports without watermark.
Free calculators for quick estimates. Pro tools for running the numbers like a business.
Save unlimited calculations into organized workspaces and projects.
Compare pricing, cost, margin, and cash flow scenarios side by side.
Export unlimited PDF reports without watermark.
Import CSV/Excel data for faster analysis.
Get AI recommendations based on your calculation results.
7-day free trial, cancel anytime.
Join thousands of SMB owners who use CalcVault to make smarter financial decisions every day.