Why we built it
Almost every payroll and billing system stores working time as decimal hours, yet almost every human writes time as hours and minutes. That mismatch creates a small, constant friction: employees decoding paycheck stubs, freelancers formatting invoices, supervisors totaling paper timecards. Each of those tasks comes down to the same divide-by-60 conversion, done under time pressure, where mistakes cost money.
We built the smallest set of tools that removes that friction completely. A bidirectional converter for single values, a minutes chart for the awkward values, a full conversion chart for lookups, and a weekly time card with a gross-pay estimate. No accounts, no tracking, no walls between you and the number you came for.
How it works
Every calculation runs locally in your browser. The converters use plain arithmetic — minutes divided by 60 in one direction, the fractional part multiplied by 60 in the other — carried to four decimal places, which is finer than any payroll rounding rule. The time card calculator adds seven daily values and multiplies by the hourly rate you enter; the rate is remembered only in your own browser's local storage.
The site is a lightweight static site, which is why it loads fast even on a patchy mobile connection. It works on any modern phone, tablet or desktop browser, and it keeps working after the page has loaded because nothing depends on a server round-trip.
What we are not
DecimalTime is not a payroll provider, an accounting service, or a source of legal or tax advice. The gross-pay figure from the time card calculator is an estimate at your straight hourly rate; overtime premiums, taxes, deductions and local labor-law rules are intentionally out of scope. For pay decisions, trust your payroll system and, where it matters, a professional.
If a number on this site ever disagrees with your payroll provider, the provider wins — our job is to help you understand the difference, not to replace the system of record. Feedback and corrections are always welcome; the tools exist to be useful.