ODE clarifies the use of calculators for testing on their website with the following statement:
"Calculators are important instructional tools that are allowable – but not required – for students in grades 6-12 to use while taking state tests. Students in grades 3-5 are only permitted to use a calculator if they qualify for a calculator as an accommodation. For students taking the computer-based tests, a calculator will be provided in the technology platform for the test. Students may use handheld calculators for either the computer-based or paper-based test formats and schools may permit them to bring their own handheld devices for test purposes." You will find more information on the use of calculators on the test on their Mathematics-Calculator Guidance site.
The Ohio Online Testing permit using Desmos as the online calculator.
Basic Online Calculator with 10-digit keypad and 4 functions to add, subtract, multiply and divide numbers. Includes basic handheld calculator functions for square, square root, percent, sign change, Pi and memory. (ES, MS, HS)