No, I am not an Airbus pilot. I am an engineer who understands takeoff performance very well and have access to enough A320neo data to know that this is not a calculator I would ever consider using. As an example, first read what Flex thrust is and understand what Flex temps would be valid for the A320neo with Leap 1A-26 engines here FBW A32NX Autothrust/Levers - #32 by AwarePlot117729.
Then use this calculator for determining takeoff performance for an A320-251N from KSEA 16L, Conf 1+F, no bleeds, FWD CG, dry, no wind, 29.92 in Hg (1013.25 hpa), 15 C temp. This calculator returns a Flex temp of 25 C, which is not a valid Flex temp for the Leap 1A-26 engines nor for any engine I know of for any jet transport. Also, having a VR to V2 split of 111 knots to 143 knots is ludicrous for this takeoff. Step up the weight in 1000 kg increments and watch the Flex temp first go up, then back down. At 64 T, it tells you that TOGA is needed, when in reality you would still be able to use a Flex temp of nearly 70 C.