Калькулятор

<div class="content-container form-container form-2">
		<div class="container">
			<form name="form" onsubmit="return false;" method="post">
				<div class="form-row">
					<div class="sub-title-2">Параметры помещения</div>
					<div class="field-container"><label for="field-1">Ширина помещения (м)</label><input type="text" onchange="form_perimetr()" required="" name="mywidth" onkeyup="return proverka(this);" placeholder="3.3" id="field-1"></div>
					<div class="field-container"><label for="field-2">Длина помещения (м)</label><input type="text" onchange="form_perimetr()" required="" name="mylength" onkeyup="return proverka(this);" placeholder="5" id="field-2"></div>
					<div class="field-container"><label for="field-3">Периметр помещения (м)</label><input type="text" name="perimetr" value="" id="field-3"></div>
					<div class="field-container"><label for="field-4">Высота потолков (м)</label><input type="text" onkeyup="return proverka(this);" required="" name="pheight" placeholder="2.7" id="field-4"></div>
				</div>
				<div class="form-row">
					<div class="sub-title-2">Двери окна</div>
					<div class="field-container"><label for="field-5">Количество дверей (шт)</label><input type="text" onkeyup="return proverka(this);" required="" name="dorcol" placeholder="1" id="field-5"></div>
					<div class="field-container"><label for="field-6">Высота двери (см)</label><input type="text" onkeyup="return proverka(this);" required="" name="dorpheight" placeholder="190" id="field-6"></div>
					<div class="field-container"><label for="field-7">Ширина двери (см)</label><input type="text" onkeyup="return proverka(this);" required="" name="dorwidth" placeholder="70" id="field-7"></div>
<br>
					<div class="field-container"><label for="field-8">Количество окон (шт)</label><input type="text" onkeyup="return proverka(this);" required="" name="wincol" placeholder="1" id="field-8"></div>
					<div class="field-container"><label for="field-9">Высота окна (см)</label><input type="text" onkeyup="return proverka(this);" required="" name="winpheight" placeholder="120" id="field-9"></div>
					<div class="field-container"><label for="field-10">Ширина окна (см)</label><input type="text" onkeyup="return proverka(this);" required="" name="winwidth" placeholder="100" id="field-10"></div>
				</div>
				<div class="form-row">
					<div class="sub-title-2">Параметры обоев</div>
					<div class="field-container"><label for="field-11">Длина рулона (м)</label><input type="text" onkeyup="return proverka(this);" required="" name="llehgt" placeholder="10" id="field-11"></div>
					<div class="field-container"><label for="field-12">Ширина обоев (м)</label><input type="text" onkeyup="return proverka(this);" required="" name="wwidth" placeholder="53" id="field-12"></div>
					<div class="field-container"><label for="field-13">Раппорт рисунка (см)</label><input type="text" name="rapport" required="" placeholder="1" id="field-13"></div>
					<div class="field-container empty "></div>
					<div class="field-container checkbox "><label for="field-14"><div class="box"><input type="checkbox" name="sdvig" value="" id="field-14"></div> Сдвинутый рисунок</label></div>
					<div class="field-container clear"><label>Запас на выравнивание (см)</label>
						<select name="zapas">
							<option value="0">0 см</option>
							<option value="5">5 см</option>
							<option value="10">10 см</option>
							<option value="15">15 см</option>
						</select>
					</div>
				</div>
				<div class="form-row">
					<div class="field-container"><input type="submit" onclick="form_result()" value="Вычислить"></div>
					<div class="field-container"><span class="key">Количество обоев:</span> <span class="value"><span id="result">0</span> п.м.</span></div>
					<div class="field-container"><span class="key">Количество рулонов:</span> <span class="value"><span id="result2">0</span> шт</span></div>
				</div>
			</form>
		</div>
	</div>