Pixel to Percent TypeScript/Javascript

pixelToPercent.tsx

export const pixelToPercent = (pixelNumber: number, containerSize: number) => {
    const percent = 100 / containerSize * pixelNumber;

    if (percent > 100) {
        return 100;
    } else if (percent < 0) {
        return 0;
    }

    return Math.round((percent + Number.EPSILON) * 100) / 100;
};

pixelToPercent(150, 600); // 25
pixelToPercent(200, 600); // 33.333333
pixelToPercent(800, 600); // 100
pixelToPercent(-20, 600); // 0