If 1kg costs ₹80, then 500g costs ₹40.
That is the quick answer. But what if the quantity is not exactly half? What if you want 350g, or 750g, or 1.2kg? This guide gives you the formula, real examples for common Indian grocery items, and a free tool that calculates any quantity instantly.
The Direct Answer First
| You want | Price (if 1kg = ₹80) |
|---|---|
| 100g | ₹8 |
| 250g | ₹20 |
| 500g | ₹40 |
| 750g | ₹60 |
| 1kg | ₹80 |
| 1.5kg | ₹120 |
| 2kg | ₹160 |
For any quantity not in this table, read on for the formula.
The Simple Formula
Price = (Quantity you want in grams × Price per kg) ÷ 1000
That is it. Let us apply it:
500g when 1kg = ₹80: Price = (500 × 80) ÷ 1000 = 40,000 ÷ 1000 = ₹40
350g when 1kg = ₹80: Price = (350 × 80) ÷ 1000 = 28,000 ÷ 1000 = ₹28
750g when 1kg = ₹80: Price = (750 × 80) ÷ 1000 = 60,000 ÷ 1000 = ₹60
1.2kg when 1kg = ₹80: Price = (1200 × 80) ÷ 1000 = 96,000 ÷ 1000 = ₹96
Why This Question Comes Up So Often
In Indian markets and kirana stores, almost everything is priced per kilogram — sugar, rice, dal, atta, vegetables, spices, sweets. But buyers rarely buy exactly 1kg. They buy what their budget allows or what the recipe needs.
Common real situations:
- You have ₹50 in your pocket and want to know how much sugar you can get
- The recipe needs 400g of rice but you want to know the cost
- The shopkeeper quotes ₹80 per kg and you want to quickly verify the price for 500g
- You are comparing two stalls — one charges ₹80 per kg, another ₹75 — and want to see the difference for your quantity
In all these situations, this one formula solves everything.
Real Examples with Common Indian Grocery Items
Sugar — ₹80 per kg (hypothetical example for this guide)
| Quantity | Price |
|---|---|
| 250g | ₹20 |
| 500g | ₹40 |
| 750g | ₹60 |
| 1kg | ₹80 |
Rice — ₹80 per kg
| Quantity | Price |
|---|---|
| 500g | ₹40 |
| 1kg | ₹80 |
| 2kg | ₹160 |
| 5kg | ₹400 |
Atta (Wheat Flour) — ₹80 per kg (premium variety)
| Quantity | Price |
|---|---|
| 500g | ₹40 |
| 1kg | ₹80 |
| 2kg | ₹160 |
| 5kg | ₹400 |
Moong Dal — ₹80 per kg (approximate)
| Quantity | Price |
|---|---|
| 200g | ₹16 |
| 250g | ₹20 |
| 500g | ₹40 |
| 750g | ₹60 |
The Reverse Calculation — How Much Will I Get for ₹X?
Sometimes you do not know the quantity you want — you know how much money you have.
Formula: Quantity = (Money you have × 1000) ÷ Price per kg
Example: You have ₹50, rice is ₹80 per kg. How much rice? Quantity = (50 × 1000) ÷ 80 = 50,000 ÷ 80 = 625 grams
Example: You have ₹30, atta is ₹80 per kg. How much atta? Quantity = (30 × 1000) ÷ 80 = 30,000 ÷ 80 = 375 grams
Example: You have ₹100, dal is ₹80 per kg. How much dal? Quantity = (100 × 1000) ÷ 80 = 100,000 ÷ 80 = 1,250 grams = 1.25 kg
The Concept Behind This — Rule of Three
This calculation is based on the Rule of Three — one of the most practical math concepts used in everyday life, especially in markets.
The idea is simple: if you know one price-quantity pair, you can find the price or quantity for any other amount — because price and quantity are directly proportional.
If 1kg = ₹80, then:
- Double the quantity = double the price
- Half the quantity = half the price
- Any fraction of the quantity = the same fraction of the price
This proportional relationship is the foundation of all market price calculations in India.
Quick Reference — Price Table for 1kg = ₹80
Here is a complete reference table you can screenshot and save on your phone:
| Quantity | Price |
|---|---|
| 50g | ₹4 |
| 100g | ₹8 |
| 150g | ₹12 |
| 200g | ₹16 |
| 250g | ₹20 |
| 300g | ₹24 |
| 350g | ₹28 |
| 400g | ₹32 |
| 450g | ₹36 |
| 500g | ₹40 |
| 600g | ₹48 |
| 700g | ₹56 |
| 750g | ₹60 |
| 800g | ₹64 |
| 900g | ₹72 |
| 1000g (1kg) | ₹80 |
| 1.5kg | ₹120 |
| 2kg | ₹160 |
How to Calculate for Any Price Per kg — Not Just ₹80
The same formula works for any rate. Just replace 80 with your actual price per kg.
Formula: Price = (Quantity in grams × Price per kg) ÷ 1000
Examples:
If 1kg sugar = ₹44, how much for 500g? Price = (500 × 44) ÷ 1000 = ₹22
If 1kg rice = ₹96, how much for 750g? Price = (750 × 96) ÷ 1000 = ₹72
If 1kg dal = ₹110, how much for 250g? Price = (250 × 110) ÷ 1000 = ₹27.50
If 1kg tomatoes = ₹60, how much for 1.5kg? Price = (1500 × 60) ÷ 1000 = ₹90
When Prices Are Not Per kg — Other Units
Some items in Indian markets are priced per litre (oil, milk, ghee) or per 100g (dry fruits, spices, saffron).
For items priced per litre: Replace 1000 with 1000 (since 1 litre = 1000 ml)
Formula: Price = (Quantity in ml × Price per litre) ÷ 1000
Example: Mustard oil ₹160 per litre, you want 500ml: Price = (500 × 160) ÷ 1000 = ₹80
For items priced per 100g: Divide the per-100g price by 100 to get per gram price, then multiply by your quantity.
Example: Cashews ₹120 per 100g, you want 250g: Price per gram = 120 ÷ 100 = ₹1.20 Price for 250g = 250 × 1.20 = ₹300
Skip the Math — Use RateCalc
If you find yourself doing this calculation regularly — at the market, at your kirana store, or when comparing prices — there is a free tool built exactly for this.
RateCalc.in is a free proportional calculator for Indian buyers and shopkeepers. You enter:
- Known price (₹80)
- Known quantity (1kg)
- New quantity (500g)
And it instantly shows you ₹40 — with the full formula shown step by step.
It also works in reverse — enter your budget (₹50) and it tells you exactly how many grams you can buy.
RateCalc works offline, needs no app download, and is free forever.
Tips for Buyers at Indian Markets
Always do a quick check. If 1kg is ₹80, then 500g should be exactly ₹40. If the shopkeeper charges ₹45 for 500g, politely ask for clarification.
Use round numbers to estimate first. ₹80 per kg means ₹8 per 100g. So 500g = 5 × ₹8 = ₹40. This mental shortcut works for quick verification.
Watch for price inflation on small quantities. Some vendors charge slightly more per gram for smaller quantities because they know buyers won’t check. The formula protects you.
Compare per kg rates before comparing small quantity prices. Two vendors may charge differently for 500g, but when converted to per kg, one may be cheaper.
Tips for Shopkeepers
Know your per gram rate. If you sell at ₹80 per kg, your rate is ₹0.08 per gram. Keeping this in mind helps you quickly estimate even without a calculator.
Use consistent pricing. Always calculate from the per kg rate. Do not vary the price based on the customer or gut feeling — it creates disputes and damages trust.
Update your calculator when wholesale prices change. If your supplier increases the rate from ₹80 to ₹88 per kg, recalculate all your selling prices immediately. A small per kg increase has a compounding effect across hundreds of transactions.
Frequently Asked Questions
Q: If 1kg is ₹80, how much is 500g? A: ₹40. Exactly half, since 500g is half of 1kg.
Q: What if I want an odd quantity like 375g? A: Use the formula: (375 × 80) ÷ 1000 = ₹30. Or use RateCalc.in for instant results.
Q: Does this formula work for vegetables and fruits too? A: Yes. Any item priced per kg uses the same formula — vegetables, fruits, grains, dal, spices, meat, or anything else.
Q: How do I calculate if the price is per 500g, not per kg? A: Double the per-500g price to get the per kg rate, then use the formula. Or enter the known pair (500g = ₹X) directly into RateCalc.
Q: Is there an app for this calculation? A: RateCalc.in works like an app on your phone without needing a Play Store download. Open it in Chrome and add to your home screen.
Conclusion
If 1kg is ₹80, then 500g costs ₹40 — exactly half. For any other quantity, the formula is:
Price = (Quantity in grams × ₹80) ÷ 1000
This works for sugar, rice, dal, atta, vegetables, spices, or anything sold by weight. And the reverse formula — Quantity = (Your budget × 1000) ÷ ₹80 — tells you how much you can buy for any amount of money.
For daily calculations without the math, try RateCalc.in — free, instant, works offline, built for Indian markets.