Free Online Discount Calculator for Sale Price, Savings & Tax
Discount calculator that instantly computes your discounted price, total savings, and an optional tax-inclusive total. Use it for shopping, invoices, and pricing decisions—just enter the original price and either % off or a flat discount. Results stay on screen and can be copied or printed.
Calculate Your Discount, Savings, and Final Price
1) Choose mode
2) Tax and display options
Result
Original price
—
Discount
—
Price after discount
—
Tax/GST amount
—
Total after tax
—
You save
—
What you’ll get
A clear breakdown of discount amount, final price after discount, and an optional tax-inclusive total. This makes it easy to compare offers like “25% off” vs “₹500 off”, sanity-check invoice totals, and share results with a team or customer.
Safe default: Tax/GST is calculated on the discounted price. If your billing rules differ, use this as a quick estimate and confirm with your receipt or invoice.
How to Use This Discount Calculator
Choose a calculation mode
Select Percent Off, Flat Discount, or Find Original Price based on what you know.
Enter your price details
Type the original price (or final price in Find Original mode) and fill in the discount value.
Add optional tax and formatting
Optionally set a tax/GST rate, choose currency, and pick Indian or international number formatting.
Click Calculate
Press Calculate (or hit Enter) to instantly see discount amount, final price, and total after tax.
Copy or print your result
Use Copy Result for sharing, or print the results for offline records or invoices.
Key Features of Discount Calculator
Percent or Flat Discount Modes
Calculate % off, fixed amount off, or back-calculate the original price from a discounted price.
Optional Tax / GST After Discount
Add a tax/GST rate to estimate the tax amount and a total after tax on the discounted price.
Indian & International Number Formatting
Switch between Indian (12,34,567) and international (1,234,567) formatting for easier reading and sharing.
Copy & Print Friendly Results
Copy a clean text summary or print the result area for quick records, quotes, or checks.
Privacy-Safe, Offline Calculations
Runs entirely in your browser with no uploads, no accounts, and no stored inputs by default.
Mobile-First, Accessible UI
Big touch targets, keyboard support, and inline validation errors designed for fast use on any device.
Formula Used / How This Tool Works
Percent Off:
Discount = Original × (Discount% ÷ 100)
Discounted Price = Original − Discount Flat Discount:
Discounted Price = Original − DiscountAmount
Effective Discount% = (DiscountAmount ÷ Original) × 100 Find Original Price:
Original = FinalBeforeTax ÷ (1 − Discount% ÷ 100)
Discount = Original − FinalBeforeTax Optional Tax/GST (estimate):
Tax = Discounted Price × (Tax% ÷ 100)
Total After Tax = Discounted Price + TaxOriginal price
The starting price before any discount is applied. This is the base used to compute savings for percent-off and flat discounts.
Discount value
Either a percentage (like 20%) or a fixed amount (like ₹500). The tool converts between them when possible to show an effective rate.
Discounted price
The price after subtracting the discount from the original. This is often the subtotal before taxes and extra fees in many checkouts.
Tax/GST (optional)
If you enter a tax/GST rate, the tool estimates tax on the discounted price and shows a total after tax for quick comparisons.
Rounding
You can choose standard rounding, round-down, or round-up to better match how invoices or billing systems might round values.
Example in simple terms: if an item costs ₹2,499 and it’s 20% off, the discount is ₹2,499 × 0.20 = ₹499.80, so the discounted price becomes ₹1,999.20 before tax. If you add 18% GST as an estimate, the tax would be ₹1,999.20 × 0.18 = ₹359.86, giving a total after tax of ₹2,359.06 (rounded).
Assumptions: Tax/GST is applied after the discount and calculated on the discounted price. This is a safe default for estimation, but real invoices may apply different rules or rounding.
Practical Examples
Online shopping in Mumbai (percent discount)
Input: Original ₹2,499, Discount 20%, Tax 0%
Result: Discount ₹499.80, Price after discount ₹1,999.20
Use Case: Quickly compare a “20% off” deal with other offers before checkout.
Electronics offer in Bengaluru (flat discount + GST estimate)
Input: Original ₹75,000, Discount ₹7,500, Tax 18%
Result: Effective discount 10.00%, Price after discount ₹67,500.00, Tax ₹12,150.00, Total after tax ₹79,650.00
Use Case: Validate a quote and see how much GST changes the final payable amount.
Retail sale in the US (percent discount + sales tax estimate)
Input: Original $120, Discount 35%, Tax 8.25%
Result: Discount $42.00, Price after discount $78.00, Tax $6.44, Total after tax $84.44
Use Case: Estimate the checkout total when tax is added at the end.
Back-calculate original price (find original mode)
Input: Final price ₹999 (before tax), Discount 25%, Tax 0%
Result: Original price ₹1,332.00, Discount ₹333.00
Use Case: Understand the “was” price behind a discounted tag to compare across stores.
What Is Discount Calculator?
A discount calculator is a simple tool that helps you convert common sale offers into clear numbers: how much you save and what you actually pay. Instead of doing mental math (or guessing), you can enter a price and either a percent discount or a flat amount off to get an instant breakdown.
This tool is useful for shoppers comparing deals, small business owners creating quick quotes, and teams validating invoice totals. It also includes an optional tax/GST estimate so you can compare “pre-tax” vs “after-tax” totals when that matters for budgeting.
For best results, use the same rounding and tax approach your store or billing system uses. If your receipt rounds each line item or applies multiple promotions, the final total can differ slightly—even if the discount math itself is correct.
Sources & Methodology
This calculator uses standard percentage discount math taught in basic commerce and accounting: percent-off discounts are computed from the original price, flat discounts are subtracted directly, and optional tax/GST is estimated on the discounted price as a safe default. Rounding options are provided to help match typical invoice rounding behavior.
Frequently Asked Questions
Yes. This Discount Calculator is 100% free to use with no signup, no paywall, and no usage limits. You can calculate sale price, savings, and an optional tax-inclusive total as many times as you like.
Yes. Everything runs locally in your browser. Your inputs are processed on your device and are not sent to any server. By default, this page does not store your values in localStorage, cookies, or any database.
For standard discounts, the results are mathematically exact based on the inputs you provide (percent-off or flat amount-off). Small differences can happen if a store applies rounding rules, stacks multiple discounts, or calculates tax on a different base. Always verify totals against the final invoice or receipt when money is on the line.
This tool focuses on a single discount at a time. If you have stacked discounts, apply them one after another: first calculate the price after the first discount, then use that result as the new original price for the second discount. This matches how most sequential discounts work in real checkout systems.
A percent discount reduces the price by a percentage of the original price (for example, 15% off). A flat discount subtracts a fixed amount (for example, ₹500 off). This calculator supports both, and it also shows the “effective percent” when you enter a flat discount.
Not always. The tax/GST field here is an optional estimate that assumes tax is applied after discount on the discounted price. In real billing, tax rules can vary by country, state, product category, and whether prices are tax-inclusive. Use this as a quick check, then confirm with your invoice format.
Common reasons include rounding at line-item level, taxes applied before discount instead of after, multiple promotions (coupons + cart discounts), shipping/handling fees, or minimum purchase conditions. If your store shows per-item rounding, try matching those steps manually and compare the subtotal and tax lines.
Yes. Indian formatting is the default (en-IN). You can switch to international formatting (1,234,567) using the number format option. Currency symbols and separators will update in the results to make copying and sharing clearer.