What is RateCalc?

RateCalc is a free proportional calculator (Rule of Three) that instantly calculates unknown prices or quantities. Perfect for kirana store owners, vegetable vendors, grain traders, housewives, and anyone who shops at a market or mandi.

No mental math. No guessing. Just enter two values and get the exact answer instantly.

The Two Problems RateCalc Solves

Problem 1 — I know the price, what quantity do I get?

Example: 800g of chocolate = ₹350. You have ₹134.
Formula: Unknown Qty = (134 × 800) ÷ 350 = 305.7 grams

Problem 2 — I know the quantity, what price do I pay?

Example: 1kg sugar = ₹40. You want 75g.
Formula: Unknown Price = (75 × 40) ÷ 1000 = ₹3

Real Market Examples

Product	Known Pair	Question	Answer
🍫 Chocolate	800g = ₹350	I have ₹134	305.7g
🧂 Sugar	1kg = ₹40	I want 75g	₹3
🥛 Milk	1L = ₹60	I have ₹25	416ml
⛽ Petrol	1L = ₹105	I want 2.5L	₹262.50
🧵 Fabric	1m = ₹200	I have ₹80	0.4m

How to Use RateCalc in 4 Steps

Step 1: Choose your mode — Find Quantity or Find Price.

Step 2: Enter the Known Price and Known Quantity in Panel 1.

Step 3: Enter your new price or new quantity in Panel 2.

Step 4: Click Calculate Answer — get exact result with formula shown.

Units Supported

g, kg, ml, L, pcs, oz, lb, m, cm, ft. Auto-converts: 1500g shows as 1.5kg automatically.

Currencies Supported

₹ INR, $ USD, € EUR, £ GBP, AED, ¥ JPY, ৳ BDT, ₦ NGN, ₱ PHP, Kr SEK.