About CalcCircuit
Last updated: 2026-08-27
CalcCircuit is a free utility platform offering 250+ calculators, converters, and productivity tools across 8 categories. We help people make faster, better-informed decisions about money, health, work, energy, and math — without sending a single piece of personal data to our servers.
Our mission
We believe useful, accurate tools should be free, fast, and private. Every calculator on CalcCircuit runs in your browser. Your numbers never leave your device. No login, no tracking pixels on the calculator page, no friction.
We make money through unobtrusive, clearly-labelled advertising (Google AdSense) and optional affiliate links in editorial content. If you'd like to support us without seeing ads, consider creating a free account — accounts get an ad-light experience and cloud sync of saved calculations.
By the numbers
What we offer
Work Tools
Salary, hourly wage, overtime, PTO, freelance rates, commission, and tip calculators.
Finance
Compound interest, mortgage, loan, retirement, FIRE, savings, and tax calculators.
Energy
Electricity cost, EV charging, solar ROI, heat pump, and appliance energy calculators.
Health & Fitness
BMI, BMR, calorie, macro, body fat, heart rate zone, and water intake calculators.
Math
Percentage, fraction, ratio, average, standard deviation, GPA, and margin calculators.
Converters
Length, weight, temperature, area, volume, speed, pressure, data, and currency converters.
AI Productivity
Prompt generator, resume summary, LinkedIn headline, cover letter, and email subject generators.
Generators
Password, UUID, QR code, lorem ipsum, color palette, dice roll, and coin flip generators.
Editorial standards
- Every calculator lists the formulas it uses so you can verify the result.
- We cite authoritative sources (e.g. IRS, BLS, ACSM, WHO) where applicable.
- Calculations are tested against known reference values before publication.
- Editorial content is written or reviewed by people with subject-matter expertise.
- We mark sponsored placements and never let sponsors influence the result of a calculation.
Accessibility
We aim for WCAG 2.1 AA. Every calculator works with keyboard navigation, screen readers, high-contrast mode, and reduced-motion preferences. If you find an accessibility issue, please tell us — we fix them quickly.
Privacy first
All calculations happen directly in your browser. We do not collect or store your personal financial or health data. We use a consent banner so you can choose whether to allow analytics and personalized ads. Read the full details in our Privacy Policy.
Contact
For anything else, see the Contact page. We respond within two business days.