About Calcr
Calcr provides free calculators with visible rules and worked examples, plus a small collection of browser games for a break.
Updated
Practical calculations, with the rules visible
Calcr helps you finish common numerical tasks: evaluate an expression, work with fractions and percentages, estimate a weighted grade, or compare dates and clock times. Calculators are free to use. Visitors do not need an account, subscription or payment card.
Each tool pairs the interactive calculation with formulas, worked examples and limits. When a convention can affect the answer, such as inclusive date counting or a leap-day anniversary, the documentation states it. The methodology page collects those choices.
A small space to play
Browse the games directory to open a short browser game, or use Code Mode as an optional shortcut with public codes. It does not change ordinary calculator expressions or claim to bypass another website's controls.
Funding and independence
Calcr provides its calculators and games without subscriptions or paid unlocks. Optional Google Analytics helps us understand page and tool use only after you choose Allow analytics. Advertising remains off. Calculators and games work when you reject analytics. You can change your choice through Privacy settings in the footer; see the privacy policy and cookie policy.
Calcr is an independent website. It does not claim to be another calculator service, a school, a certification body or an official source of academic records.
Corrections and contact
Calcr is operated by Calcr Team. For questions or corrections, email support@calcr.app. The contact page explains which details help reproduce a calculation issue.