WorkweekMath is a free set of calculators for hourly work and pay: time cards, overtime, pay conversions, business days and time conversions. We built it so that hourly workers, small-business owners and HR teams can check their numbers quickly and see how each result was calculated.
Who we are
WorkweekMath.com is built and operated by Sunteco Joint Stock Company, a cloud computing and software company founded in 2021. Sunteco runs a cloud platform with more than 40 services, including virtual machines, object storage, Kubernetes, databases and a CDN, and serves businesses in a range of industries.
Sunteco’s operations hold these certifications:
- ISO/IEC 27001 (information security management)
- ISO 9001 (quality management)
- PCI DSS (payment card data security)
The engineers who build Sunteco’s cloud infrastructure also build and maintain WorkweekMath. We apply the same standards of testing, security and reliability to a time card calculator that we apply to production cloud systems.
Why we built WorkweekMath
Every week, millions of Americans add up hours by hand, convert minutes to decimals for payroll, or try to work out whether their overtime was paid correctly. Most free calculators online fall into one of two groups. Some are outdated and don’t account for state rules. Others are sign-up forms for time-tracking software, with a calculator attached.
We wanted to offer something else:
- Free, with no account required. Every calculator works without signing up.
- Transparent. Each tool shows the formula and a worked example using your own numbers.
- State-aware. Overtime and break rules differ from state to state, and our tools reflect the differences we have verified.
- Private by design. Calculations run in your browser (see “Your privacy” below).
How we build and check our calculators
- We start from primary sources. Federal rules come from the U.S. Department of Labor (Fair Labor Standards Act) and the IRS. State rules come from each state’s labor department and statutes. We do not rely on other calculator sites.
- We keep calculations separate from the interface. Every rule is coded in a dedicated calculation engine and covered by automated tests. The tests include edge cases such as overnight shifts, split shifts, time rounding, and daily and weekly overtime applying in the same week.
- We cite our sources on the page. Pages with legal or tax information list their official sources and show a “Last reviewed” date.
- We only publish verified rules. If we have not yet confirmed a state rule, we say so and link to the official source instead of guessing.
- We review on a schedule. We re-check state data at least once a year, and again whenever laws change (for example, minimum wage changes that take effect on January 1).
Editorial team and review
An Nguyen, HR manager “SHRM-CP, 10 years in US payroll administration”, reviews our labor-law and pay content. [One or two sentences on relevant experience.] LinkedIn
The Sunteco engineering team builds and tests the calculators.
Your privacy
Our calculators run in your web browser. The hours, pay rates and dates you enter are not sent to our servers or stored by us. Shareable links contain your inputs in the URL, so only share a link with people you want to see those inputs. For details on analytics and advertising cookies, see our Privacy Policy.
Independence and how we make money
WorkweekMath is free because it shows advertising. Some of our software comparison pages contain affiliate links: if you sign up for a product through one of these links, we may earn a commission at no extra cost to you. These links are always marked.
Advertisers and affiliate partners have no influence over our calculations, rankings or reviews. We do not accept payment to change results.
Important: WorkweekMath provides general information and estimates. It is not legal, tax or payroll advice, and it is not a substitute for your employer’s official payroll records. For questions about your specific situation, contact your state labor department, the U.S. Department of Labor Wage and Hour Division, or a qualified professional.
Corrections
If you find a calculation error or an out-of-date rule, please tell us at [contact@workweekmath.com]. Include the page URL and the source that shows the correct rule. We review every report and aim to fix confirmed errors within [5 business days], then update the page’s “Last reviewed” date.
Contact
WorkweekMath.com, a product of Sunteco Joint Stock Company
3rd Floor, Lotus Building, No. 2 Duy Tan, Cau Giay District, Hanoi, Vietnam
Business registration no. 0109727097
Email: [contact@workweekmath.com]
Company: sunteco.io · LinkedIn