About Calculatly — Free Everyday Online Calculators

Number problems show up constantly: a percentile on a growth chart, a mortgage payment, a tip split four ways. You shouldn't need a spreadsheet, a paid app, or a login to get a straight answer.

• Free to use — every calculator on the site stays open
• Runs in your browser — your inputs stay on your device
• Plain language — results you can actually read and use
• Tested before we ship — each tool is checked against known examples

We organize tools into six categories: Math & Numbers, Finance & Money, Health & Body, Date & Time, Conversions & Units, and Everyday Tools. Some categories are fully live; others are growing one calculator at a time.

Browse the full shelf on the home page.

The product is the tools. We pay the bills with unobtrusive advertising and the occasional affiliate link when we recommend a related product or service. We never gate answers behind a paywall or subscription.

Advertising and analytics are described in our Privacy Policy.

Calculatly is built for everyday informational use. Results are estimates based on standard formulas and published reference data. For medical, financial, tax, or legal decisions, always consult a qualified professional. See our Terms of Service for the full disclaimer.

Have a calculator we should build, a bug to report, or feedback on an existing tool? We'd like to hear from you. Visit our Contact page or email hello@calculatly.com.