In the future, we will able to embed a Jotform form to enable simple addition, subtraction, division and multiplication calculations to be performed on an RDS page. The user can be taken to an appropriate output page based on the result of the calculation.
We are writing a standard operating procedure with quality assurance and governance requirements for publishing these tools on RDS.
Note that simple calculations which contain only a few variables and use basic functions available on a simple calculator (+, -, ×, ÷) generally are not categorised as medical devices - see MHRA guidance. If you want to use more complex calculations, please contact the RDS team to discuss your requirements. Information on medical device definition and Medical Device Regulations is available in the RDS standard operating procedure Implementing the Medical Device Regulations.
Creating a calculation
- After logging in to your account, from my workspace, click ‘Create’ and select ‘Form’.
- Choose 'Start from scratch' and 'Classic form'.
- Add a number field, which will allow the user to input a numerical value to the form.
- Navigate to the Build tab, Form Elements, then ‘BASIC’.
- Scroll down to the ‘BASIC ELEMENTS’ section, then click ‘Number’ to add a new number field to the form.
- Number fields will allow the user to input a numerical value to the form.

- Add a calculation question, which will output the answer of a mathematical operation.
- Navigate to the Build tab, Form Elements, then 'WIDGETS’.
- Click ‘Form Calculation’ to add a calculation question and open the Form Calculation Widget panel on the right of the screen.
- You can open Form Calculation Widget panel again later by clicking on the calculation question then clicking ‘Widget Settings’.

- Enter an equation into the Form Calculation Widget panel.
- Clicking ‘ADD FIELD’ allows you to choose a number input question. The value typed in the box will be added to the equation.
- Combine number fields with constants or numerical operators to create an equation.
Example calculations
You can combine the two number fields with a numerical operator to create a formula, e.g. [Number1]+[Number2], [Number1]*[Number2].
