About CalculatorJar
Free, accurate calculators to help you make better decisions about money, health, and everyday life.
Meet the Team
Our Mission
Complex calculations shouldn't require a finance degree or hours of spreadsheet work. CalculatorJar was founded on a simple idea: everyone deserves access to the same analytical tools that professionals use—without the complexity.
What started as a few basic calculators has grown into a library of 167+ tools covering finance, health, construction, math, and everyday life. Each one is researched, tested for accuracy, and designed to be genuinely useful.
Why CalculatorJar?
Lightning Fast
All calculations happen instantly in your browser. No waiting for servers or page reloads.
Verified Accuracy
Industry-standard formulas from authoritative sources. Each calculator is tested before publishing.
Privacy First
Your data stays in your browser. We never store or transmit your personal calculations.
Our Approach
Research-Based Formulas
Every formula is sourced from authoritative references—IRS publications for taxes, CDC guidelines for health, and building codes for construction.
Tested Before Publishing
Each calculator is tested against known values and edge cases. We verify results match real-world examples before going live.
Regular Updates
Tax rates change, regulations update. We continuously review and update our calculators to ensure they reflect current standards.
Our Sources
We rely on authoritative sources for our formulas and reference data:
Finance & Tax
- • IRS Publications & Tax Tables
- • Federal Reserve Economic Data
- • Bureau of Labor Statistics
- • SEC Filings & Guidelines
Health & Medical
- • CDC Guidelines
- • NIH Research Publications
- • WHO Standards
- • Peer-Reviewed Medical Journals
Construction
- • International Building Code (IBC)
- • National Electric Code (NEC)
- • ASHRAE Standards
- • Manufacturer Specifications
Legal
- • State Bar Associations
- • Court Fee Schedules
- • Government Legal Resources
- • Official Settlement Guidelines
Quick Stats
Have a Calculator Request?
Join our Reddit community to request new calculators, report bugs, or suggest improvements. We actively read and respond to all posts!