Calculators
Free instant calculators for GPA, BMI, age, compound interest, and percentages. No signup. No tracking.
Percentage Calculator
Calculate percentages instantly
Quickly find percentages, percent of values, and percent change
GPA Calculator
Track your academic performance
Calculate cumulative GPA based on credits and grades. Supports 4.0 scale.
Age Calculator
Find your exact age in years, months, and days
Calculate exact age in years, months, days and total days. Shows birth day and days until birthday.
BMI Calculator
Calculate your body mass index
Calculate BMI using height and weight. Supports metric and imperial units with category display.
Compound Interest Calculator
Calculate investment growth over time
Calculate compound interest with annual, quarterly, monthly or daily compounding.
Scientific Calculator
Advanced calculations with trigonometric functions
Advanced math with sin, cos, tan, log, ln, square root. Supports degrees and radians.
Fraction Calculator
Add, subtract, multiply, and divide fractions
Add, subtract, multiply, and simplify fractions
Random Number Generator
Generate random numbers within a range
Triangle Calculator
Calculate area, perimeter, and angles
Standard Deviation
Calculate statistical measures for a dataset
Unit Converter
Convert between different units of measurement
Subnet Calculator
Calculate network details from IP and subnet mask
Time & Date Calculator
Add or subtract time from dates
Inflation Calculator
Calculate future value accounting for inflation
Integration Calculator
Calculate numeric integration (area under curve)
Loan Calculator
Calculate monthly payments and total interest
Tip Calculator
Calculate tip and split the bill
Discount Calculator
Calculate sale prices and savings
Profit Margin
Calculate profit margin and markup
Speed Calculator
Calculate distance, speed, or time
Number Base Converter
Convert between binary, hex, decimal, octal
BMR Calculator
Basal Metabolic Rate - calories burned at rest
Tank Volume
Calculate volume of cylindrical tank
Concrete Calculator
Calculate concrete needed for slabs
Paint Calculator
Calculate paint needed for walls
Password Generator
Generate secure random passwords
UUID Generator
Generate unique identifiers
Date Duration
Calculate days between two dates
Tile Calculator
Calculate tiles needed for floor/wall
Toolzo Calculators: Free Online Math Tools
Comprehensive collection of free calculators for math, finance, health, and everyday use — all running locally in your browser
Toolzo provides a comprehensive suite of free calculators covering everything from basic math to advanced financial planning. Whether you need to calculate your GPA, check your BMI, compute compound interest, or convert between units, our tools deliver instant results with no server communication — your data never leaves your device.
Our calculator collection includes Percentage Calculator, GPA Calculator, Age Calculator, BMI Calculator, Compound Interest Calculator, Scientific Calculator, Loan Calculator, Inflation Calculator, Unit Converter, Fraction Calculator, Subnet Calculator, Standard Deviation, Speed Calculator, BMR Calculator, and many more. Each calculator uses standard mathematical formulas and runs client-side for privacy.
All calculators are free, require no registration, and include privacy-friendly analytics. We believe essential calculations should be accessible to everyone without hidden costs or data collection.
How to Use Toolzo Calculators
Get started in three simple steps
Choose a Calculator
Select from the dock or scroll to the calculator you need. Each tool has a clear description of what it does.
Enter Your Values
Input your numbers in the provided fields. Most calculators support common units and formats for convenience.
Get Instant Results
Results update instantly as you type or after clicking Calculate. All computation happens in your browser — nothing is sent online.
Related Calculators
Explore more tools for all your calculation needs
Why Toolzo Calculators Are Different
Our calculators run entirely in your browser with no server communication. Your calculations are never sent to any server, ensuring complete privacy. Whether you're calculating your GPA, checking your BMI, or planning investments, your data stays on your device.
All calculators are free with no signup required. We believe essential calculations should be accessible to everyone. No subscriptions, no ads, privacy-friendly analytics. Just open the page and calculate instantly. The GPA calculator even saves your courses locally so you can return and continue where you left off.
Frequently Asked Questions
Find answers to common questions about our calculators
Yes, our calculators use standard mathematical formulas and algorithms to ensure accurate results. However, always double-check important calculations as we're not responsible for any errors in critical applications.
No, we don't store or track any of your calculations. All data stays in your browser and is never sent to any server. Your privacy is fully protected.
Yes! The GPA calculator has a Save button that stores your courses and grades locally in your browser. You can return later and your data will still be there (as long as you don't clear your browser cache).
BMI categories are: Underweight (below 18.5), Normal (18.5-24.9), Overweight (25-29.9), and Obese (30 and above). Note that BMI doesn't account for muscle mass, bone density, or overall body composition.
We use the standard compound interest formula: A = P(1 + r/n)^(nt), where P is principal, r is annual rate, n is compounding frequency per year, and t is time in years. You can choose from various compounding frequencies including daily, monthly, quarterly, semi-annually, and annually.
No account required! All our calculators are free to use with no signup. Just open the page and start calculating immediately.