About SD.gy

Free Online Calculators

SD.gy provides free, fast, and privacy-focused calculator tools that work directly in your browser. No uploads, no servers - just instant calculations.

Our Tools

Calculator - Basic arithmetic calculator
Percentage Calculator - Calculate percentages, discounts, and changes
Unit Converter - Convert length, weight, and temperature
Date Calculator - Calculate D-day and date differences
Age Calculator - Calculate exact age from birthdate
BMI Calculator - Calculate Body Mass Index
Tip Calculator - Calculate tips and split bills
Loan Calculator - Calculate monthly loan payments

Privacy First

All calculations happen entirely in your browser. Your data never leaves your device and is never uploaded to any server. We take your privacy seriously.

Contact

For questions or feedback, please contact us at hello@sd.gy