Calculators
11 free calculators for everyday math, dates, finance, and freelancing. All instant, all in your browser.
Percentage Calculator
5 percentage calculations in one tool
Age Calculator
Exact age + birthday facts
Date Calculator
Date differences & add/subtract
Time Calculator
Add, subtract, multiply, divide times
Compound Interest Calculator
Investment growth over time
Profit Margin Calculator
Margin & markup
Freelance Rate Calculator
Find your ideal hourly rate
Hourly to Salary Calculator
Hourly ↔ yearly
Fiverr Fee Calculator
20% fee calculator
Upwork Fee Calculator
10% fee calculator
Password Generator
Strong random passwords
Everyday calculators
- Percentage: Tips, discounts, tax, growth rates
- Age: Exact age in years, months, days, and hours
- Date: Days between dates, add/subtract time periods
- Time: Total up work hours, calculate durations
Business & finance
- Compound Interest: See investment growth over decades
- Profit Margin: Calculate margin and markup from cost & price
- Freelance Rate: Work out your ideal hourly rate
- Hourly to Salary: Convert between hourly, weekly, monthly, yearly
- Fiverr/Upwork Fees: See what you keep after platform fees
Privacy
All calculations run locally in your browser. Nothing is uploaded or stored.
Frequently Asked Questions
Are these calculators free?
Yes, all free. No signup, no limits.
Is my data uploaded?
No. All calculations happen in your browser. Nothing is sent to a server.
Are the results accurate?
Yes. All formulas follow standard financial and mathematical conventions. Results are estimates where noted (e.g., compound interest assumes constant rates).
Can I use these for business?
Yes. Profit margin, freelance rate, and Fiverr/Upwork fee calculators are designed for freelancers and small businesses.
What about taxes?
Results are gross amounts. For net take-home, subtract your local taxes. The Freelance Rate Calculator lets you input your tax rate for accurate net values.