Thanks for testing out the Kalculator. I wasn’t able to recreate the bug you describe — you should be able to input unit costs for values less than $1 increments. However, if you enter $0.50, it will remove the trailing zero and save as $0.5. I’ll change this in the next iteration, so that these numbers properly display as currency.
Please give it another try and let me know if the inputs are still not allowing you to add increments in cents. Again, thanks for sharing your feedback!