My function does not work, how can i make it work? – Blancer.com Tutorials and projects

I am learning Js, and when trying to make a system that: 1. Take the user speed> 2. Compare with the speed allowed on road 3. > ask the user if he was within speed or not. however, when I perform absolutely nothing happens, I have reviewed it thousands of times, looked for syntax errors and still does not run. You can help me?

<!DOCTYPE html>
<html lang="pt-br">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Sist. De Multas</title>
</head>
<body>

    <h1>DETRAN</h1>
    
    
Velocidade de tráfego: <input type="number" name="txtvel" id="txtvel"> Km/h>

    <input type="button" value="Verificar" name="button">

    <div id="res">
        Resultado da verificação:
    </div>

    <script>
   
        function calcular(){
        var calcular = valor.addEventListener('click', calcular)
        var txtv = document.getElementById(txtvel)
        var conversor = Number(txtv.value)
        res.innerHTML = <p>`Sua Velocidade é de ${conversor}`</p>
            if(conversor > 60){
                res.innerHTML = <p>`Multa pendente no sitema por excesso de velocidade ${conversor}Km/h`</p>
            }else{
                res.innerHTML = 'Sem multa pendente'
            }
        }
    </script>

</body>
</html>