Error message
Deprecated function: Creation of dynamic property Drupal\tablefield\TableValue::$value is deprecated in Drupal\Core\TypedData\TypedData->setValue() (line 102 of core/lib/Drupal/Core/TypedData/TypedData.php).
Drupal\Core\TypedData\TypedData->setValue(NULL, ) (Line: 87) Drupal\Core\TypedData\Plugin\DataType\Map->setValue(Array, ) (Line: 125) Drupal\Core\Field\FieldItemBase->setValue(Array, ) (Line: 206) Drupal\tablefield\Plugin\Field\FieldType\TablefieldItem->setValue(Array, ) (Line: 208) Drupal\Core\TypedData\TypedDataManager->getPropertyInstance(Object, 0, Array) (Line: 91) Drupal\Core\Field\FieldTypePluginManager->createFieldItem(Object, 0, Array) (Line: 41) Drupal\Core\Field\FieldItemList->createItem(0, Array) (Line: 69) Drupal\Core\TypedData\Plugin\DataType\ItemList->setValue(Array, ) (Line: 107) Drupal\Core\Field\FieldItemList->setValue(Array, ) (Line: 208) Drupal\Core\TypedData\TypedDataManager->getPropertyInstance(Object, 'field_calc_table', Array) (Line: 83) Drupal\Core\Field\FieldTypePluginManager->createFieldItemList(Object, 'field_calc_table', Array) (Line: 633) Drupal\Core\Entity\ContentEntityBase->getTranslatedField('field_calc_table', 'x-default') (Line: 597) Drupal\Core\Entity\ContentEntityBase->get('field_calc_table') (Line: 325) Drupal\Core\Entity\EntityViewBuilder->buildComponents(Array, Array, Array, 'default') (Line: 281) Drupal\Core\Entity\EntityViewBuilder->buildMultiple(Array) (Line: 18) Drupal\paragraphs\ParagraphViewBuilder->buildMultiple(Array) (Line: 238) Drupal\Core\Entity\EntityViewBuilder->build(Array) call_user_func_array(Array, Array) (Line: 111) Drupal\Core\Render\Renderer->doTrustedCallback(Array, Array, 'Render #pre_render callbacks must be methods of a class that implements \Drupal\Core\Security\TrustedCallbackInterface or be an anonymous function. The callback was %s. See https://www.drupal.org/node/2966725', 'exception', 'Drupal\Core\Render\Element\RenderCallbackInterface') (Line: 859) Drupal\Core\Render\Renderer->doCallback('#pre_render', Array, Array) (Line: 421) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 240) Drupal\Core\Render\Renderer->render(Array) (Line: 475) Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 68) __TwigTemplate_291debf4453c7ba2e34da4fa4cd83699->doDisplay(Array, Array) (Line: 394) Twig\Template->displayWithErrorHandling(Array, Array) (Line: 367) Twig\Template->display(Array) (Line: 379) Twig\Template->render(Array) (Line: 38) Twig\TemplateWrapper->render(Array) (Line: 39) twig_render_template('themes/techprosolutions/templates/field/field.html.twig', Array) (Line: 348) Drupal\Core\Theme\ThemeManager->render('field', Array) (Line: 480) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 240) Drupal\Core\Render\Renderer->render(Array) (Line: 475) Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 111) __TwigTemplate_ff95cc8dbd011c21d5f5e7f83f8118b4->doDisplay(Array, Array) (Line: 394) Twig\Template->displayWithErrorHandling(Array, Array) (Line: 367) Twig\Template->display(Array) (Line: 379) Twig\Template->render(Array) (Line: 38) Twig\TemplateWrapper->render(Array) (Line: 39) twig_render_template('modules/custom/easytax_calculators/templates/ecp-calculator-page.html.twig', Array) (Line: 348) Drupal\Core\Theme\ThemeManager->render('ecp_calculator_page', Array) (Line: 480) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 240) Drupal\Core\Render\Renderer->render(Array, ) (Line: 238) Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 627) Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 231) Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object, Object) (Line: 128) Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90) Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object) call_user_func(Array, Object, 'kernel.view', Object) (Line: 111) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.view') (Line: 186) Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 76) Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58) Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48) Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 28) Drupal\Core\StackMiddleware\ContentLength->handle(Object, 1, 1) (Line: 32) Drupal\big_pipe\StackMiddleware\ContentLength->handle(Object, 1, 1) (Line: 191) Drupal\page_cache\StackMiddleware\PageCache->fetch(Object, 1, 1) (Line: 128) Drupal\page_cache\StackMiddleware\PageCache->lookup(Object, 1, 1) (Line: 82) Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 36) Drupal\Core\StackMiddleware\AjaxPageState->handle(Object, 1, 1) (Line: 51) Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object, 1, 1) (Line: 704) Drupal\Core\DrupalKernel->handle(Object) (Line: 21)Deprecated function: Creation of dynamic property Drupal\tablefield\Plugin\Field\FieldFormatter\TablefieldFormatter::$ModuleHandler is deprecated in Drupal\tablefield\Plugin\Field\FieldFormatter\TablefieldFormatter->__construct() (line 57 of modules/contrib/tablefield/src/Plugin/Field/FieldFormatter/TablefieldFormatter.php).
Drupal\tablefield\Plugin\Field\FieldFormatter\TablefieldFormatter->__construct('tablefield', Array, Object, Array, 'hidden', 'default', Array, Object, Object) (Line: 64) Drupal\tablefield\Plugin\Field\FieldFormatter\TablefieldFormatter::create(Object, Array, 'tablefield', Array) (Line: 64) Drupal\Core\Field\FormatterPluginManager->createInstance('tablefield', Array) (Line: 126) Drupal\Core\Field\FormatterPluginManager->getInstance(Array) (Line: 205) Drupal\Core\Entity\Entity\EntityViewDisplay->getRenderer('field_calc_table') (Line: 241) Drupal\Core\Entity\Entity\EntityViewDisplay->buildMultiple(Array) (Line: 339) Drupal\Core\Entity\EntityViewBuilder->buildComponents(Array, Array, Array, 'default') (Line: 281) Drupal\Core\Entity\EntityViewBuilder->buildMultiple(Array) (Line: 18) Drupal\paragraphs\ParagraphViewBuilder->buildMultiple(Array) (Line: 238) Drupal\Core\Entity\EntityViewBuilder->build(Array) call_user_func_array(Array, Array) (Line: 111) Drupal\Core\Render\Renderer->doTrustedCallback(Array, Array, 'Render #pre_render callbacks must be methods of a class that implements \Drupal\Core\Security\TrustedCallbackInterface or be an anonymous function. The callback was %s. See https://www.drupal.org/node/2966725', 'exception', 'Drupal\Core\Render\Element\RenderCallbackInterface') (Line: 859) Drupal\Core\Render\Renderer->doCallback('#pre_render', Array, Array) (Line: 421) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 240) Drupal\Core\Render\Renderer->render(Array) (Line: 475) Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 68) __TwigTemplate_291debf4453c7ba2e34da4fa4cd83699->doDisplay(Array, Array) (Line: 394) Twig\Template->displayWithErrorHandling(Array, Array) (Line: 367) Twig\Template->display(Array) (Line: 379) Twig\Template->render(Array) (Line: 38) Twig\TemplateWrapper->render(Array) (Line: 39) twig_render_template('themes/techprosolutions/templates/field/field.html.twig', Array) (Line: 348) Drupal\Core\Theme\ThemeManager->render('field', Array) (Line: 480) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 240) Drupal\Core\Render\Renderer->render(Array) (Line: 475) Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 111) __TwigTemplate_ff95cc8dbd011c21d5f5e7f83f8118b4->doDisplay(Array, Array) (Line: 394) Twig\Template->displayWithErrorHandling(Array, Array) (Line: 367) Twig\Template->display(Array) (Line: 379) Twig\Template->render(Array) (Line: 38) Twig\TemplateWrapper->render(Array) (Line: 39) twig_render_template('modules/custom/easytax_calculators/templates/ecp-calculator-page.html.twig', Array) (Line: 348) Drupal\Core\Theme\ThemeManager->render('ecp_calculator_page', Array) (Line: 480) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 240) Drupal\Core\Render\Renderer->render(Array, ) (Line: 238) Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 627) Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 231) Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object, Object) (Line: 128) Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90) Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object) call_user_func(Array, Object, 'kernel.view', Object) (Line: 111) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.view') (Line: 186) Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 76) Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58) Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48) Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 28) Drupal\Core\StackMiddleware\ContentLength->handle(Object, 1, 1) (Line: 32) Drupal\big_pipe\StackMiddleware\ContentLength->handle(Object, 1, 1) (Line: 191) Drupal\page_cache\StackMiddleware\PageCache->fetch(Object, 1, 1) (Line: 128) Drupal\page_cache\StackMiddleware\PageCache->lookup(Object, 1, 1) (Line: 82) Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 36) Drupal\Core\StackMiddleware\AjaxPageState->handle(Object, 1, 1) (Line: 51) Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object, 1, 1) (Line: 704) Drupal\Core\DrupalKernel->handle(Object) (Line: 21)Warning: Undefined array key "caption" in Drupal\tablefield\Plugin\Field\FieldFormatter\TablefieldFormatter->viewElements() (line 150 of modules/contrib/tablefield/src/Plugin/Field/FieldFormatter/TablefieldFormatter.php).
Drupal\tablefield\Plugin\Field\FieldFormatter\TablefieldFormatter->viewElements(Object, 'en') (Line: 91) Drupal\Core\Field\FormatterBase->view(Object, 'en') (Line: 268) Drupal\Core\Entity\Entity\EntityViewDisplay->buildMultiple(Array) (Line: 339) Drupal\Core\Entity\EntityViewBuilder->buildComponents(Array, Array, Array, 'default') (Line: 281) Drupal\Core\Entity\EntityViewBuilder->buildMultiple(Array) (Line: 18) Drupal\paragraphs\ParagraphViewBuilder->buildMultiple(Array) (Line: 238) Drupal\Core\Entity\EntityViewBuilder->build(Array) call_user_func_array(Array, Array) (Line: 111) Drupal\Core\Render\Renderer->doTrustedCallback(Array, Array, 'Render #pre_render callbacks must be methods of a class that implements \Drupal\Core\Security\TrustedCallbackInterface or be an anonymous function. The callback was %s. See https://www.drupal.org/node/2966725', 'exception', 'Drupal\Core\Render\Element\RenderCallbackInterface') (Line: 859) Drupal\Core\Render\Renderer->doCallback('#pre_render', Array, Array) (Line: 421) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 240) Drupal\Core\Render\Renderer->render(Array) (Line: 475) Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 68) __TwigTemplate_291debf4453c7ba2e34da4fa4cd83699->doDisplay(Array, Array) (Line: 394) Twig\Template->displayWithErrorHandling(Array, Array) (Line: 367) Twig\Template->display(Array) (Line: 379) Twig\Template->render(Array) (Line: 38) Twig\TemplateWrapper->render(Array) (Line: 39) twig_render_template('themes/techprosolutions/templates/field/field.html.twig', Array) (Line: 348) Drupal\Core\Theme\ThemeManager->render('field', Array) (Line: 480) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 240) Drupal\Core\Render\Renderer->render(Array) (Line: 475) Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 111) __TwigTemplate_ff95cc8dbd011c21d5f5e7f83f8118b4->doDisplay(Array, Array) (Line: 394) Twig\Template->displayWithErrorHandling(Array, Array) (Line: 367) Twig\Template->display(Array) (Line: 379) Twig\Template->render(Array) (Line: 38) Twig\TemplateWrapper->render(Array) (Line: 39) twig_render_template('modules/custom/easytax_calculators/templates/ecp-calculator-page.html.twig', Array) (Line: 348) Drupal\Core\Theme\ThemeManager->render('ecp_calculator_page', Array) (Line: 480) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 240) Drupal\Core\Render\Renderer->render(Array, ) (Line: 238) Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 627) Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 231) Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object, Object) (Line: 128) Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90) Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object) call_user_func(Array, Object, 'kernel.view', Object) (Line: 111) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.view') (Line: 186) Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 76) Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58) Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48) Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 28) Drupal\Core\StackMiddleware\ContentLength->handle(Object, 1, 1) (Line: 32) Drupal\big_pipe\StackMiddleware\ContentLength->handle(Object, 1, 1) (Line: 191) Drupal\page_cache\StackMiddleware\PageCache->fetch(Object, 1, 1) (Line: 128) Drupal\page_cache\StackMiddleware\PageCache->lookup(Object, 1, 1) (Line: 82) Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 36) Drupal\Core\StackMiddleware\AjaxPageState->handle(Object, 1, 1) (Line: 51) Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object, 1, 1) (Line: 704) Drupal\Core\DrupalKernel->handle(Object) (Line: 21)
Discount Calculator
Stack up to two successive discounts on a price and see the final price, how much you save and the true combined discount.
What does a stacked discount really save you?
A single discount is easy: 20% off ₹2,000 saves ₹400. Stacked offers are where shoppers get misled — "20% off + extra 10%" is not 30% off, because the second offer applies to an already-reduced price. The extra 10% works on ₹1,600, not on ₹2,000, so the combined saving is smaller than the two numbers added together.
This calculator takes the original price and up to two successive discounts and returns the final price, the rupees you save and the true combined discount — the effective percentage the deal is actually worth.
The successive discount formula
Final price = P × (1 − d₁ ÷ 100) × (1 − d₂ ÷ 100)
- P — the original price
- d₁ — the first discount, in percent
- d₂ — the extra discount, applied after the first
- Effective discount = (1 − final price ÷ P) × 100 — the single percentage the stack is really worth
Because the factors multiply, the effective discount is always less than d₁ + d₂ whenever both are above zero.
How to use this calculator
- Enter the original price — the tag or MRP figure before any offer.
- Set the discount percentage — the main offer.
- Set the extra discount if the deal stacks a second offer on top (coupon, card offer, "extra % off"); leave it at 0 otherwise.
You get the final price you will pay, the amount you save and the effective combined discount to compare deals like-for-like.
A worked example
₹2,000 with 20% off plus an extra 10%:
- After the first offer: ₹2,000 − 20% = ₹1,600
- After the extra 10% (on ₹1,600): final price ₹1,440
- You save ₹560 — an effective discount of 28%, not 30%
With only the single 20% offer, the same item costs ₹1,600 and saves ₹400 — exactly 20%.
What stacked offers really add up to
| Offer stack | Looks like | Actually is |
|---|---|---|
| 10% + 10% | 20% | 19% |
| 20% + 10% | 30% | 28% |
| 30% + 20% | 50% | 44% |
| 40% + 25% | 65% | 55% |
| 50% + 50% | 100% | 75% |
The gap between the headline and the effective discount widens as the percentages grow — two half-price offers stacked still leave you paying a quarter of the price.
Because the second discount applies to the already-reduced price. On ₹2,000, the extra 10% acts on ₹1,600 and saves only ₹160 — so the stack saves ₹560 (28%), not ₹600 (30%).
No. The factors multiply, and multiplication doesn't care about order: 20% then 10% gives the same final price as 10% then 20%.
GST is charged on the transaction value — the price after a discount that is recorded on the invoice. Post-sale discounts can reduce GST only under specific conditions agreed in advance. On a discounted tag price, you pay GST on what you actually pay the seller.
No. The calculator clamps at free: discounts of 100% or more make the final price ₹0 and the effective discount exactly 100% — a seller cannot pay you to take the item.
The inputs are percentages. For a flat ₹300 off a ₹2,000 item, convert first: 300 ÷ 2000 = 15%, then enter 15. For a percent offer followed by a flat coupon, apply the percent here and subtract the coupon from the final price.