Percentage, fractions, area, LCM/HCF and other core math tools for students, teachers and professionals.
Area calculations come up everywhere — flooring estimates, painting walls, garden plots, fabric for tailoring and school geometry. The InstantTool area calculator handles the four most common shapes (rectangle, square, circle, triangle) with the right formula auto-applied based on your selection.
An average summarizes a list of numbers into a single representative value. The most common is the arithmetic mean (sum ÷ count), but median (middle value) and mode (most common value) are equally important — especially when the data has outliers. The InstantTool average calculator gives all three.
Currency conversions are essential for Indian travelers, freelancers earning in USD/EUR/GBP and online shoppers buying from international stores. The InstantTool currency converter gives quick reference conversions between INR and major world currencies. For exact transactional rates, always check your bank or remittance provider.
A discount calculator helps you see the actual price you'll pay after a percentage discount and the rupees you save. With Indian e-commerce festivals like Big Billion Days and Great Indian Sale, double-checking the discount math protects you from inflated MRPs and 'fake discount' tricks.
Fractions are essential in cooking, construction, sewing and school math. Manual fraction arithmetic — finding common denominators and simplifying — is error-prone. The InstantTool fraction calculator handles all four operations on any two fractions and reduces the result to lowest terms.
LCM and HCF (also called GCD) are fundamental concepts in arithmetic. LCM is the smallest number divisible by all inputs; HCF is the largest number that divides all inputs evenly. They show up in school math, number theory, simplifying fractions and scheduling problems.
Length is the most-converted unit in everyday life — from quoting room sizes (sq ft), cloth measurements (metres, inches), travel distances (km, miles) and printing (mm, inches). The InstantTool length converter supports all common metric and imperial units in one place.
A percentage expresses a number as a fraction of 100. We use percentages everywhere — exam scores, GST, discounts, tips, salary hikes and statistics. The InstantTool percentage calculator gives you three ready-made calculators on one page so you don't have to switch screens for the most common percentage problems.
Profit & Loss is the foundation of every business. Profit = Selling Price − Cost Price (when SP > CP); Loss = CP − SP (when CP > SP). Profit/Loss percentage is calculated on cost price. The InstantTool P&L calculator works for individual transactions or batched amounts — useful for retail, freelancing and side hustles.
Ratios compare two quantities — students see them in math, recipes, finance (PE ratio, debt-to-equity), construction (concrete mix) and design (aspect ratios). The InstantTool ratio calculator simplifies a ratio to its lowest terms, finds equivalent ratios and solves proportion problems with a missing term.
A scientific calculator extends a basic calculator with functions used in science, engineering and advanced math — sin, cos, tan, log, ln, sqrt, exponents (^) and constants like π and e. The InstantTool scientific calculator supports all the common functions plus parentheses for complex expressions, and works entirely in your browser with no install.
Simple Interest is the most basic interest formula — interest is calculated only on the original principal, never on accumulated interest. While most banks use compound interest, simple interest still applies to many short-term loans, hand loans and certain personal contracts. This tool computes interest and the total amount payable.
The relationship between speed, distance and time is one of the most-used physics formulas: Speed = Distance ÷ Time. Rearranging it solves any of the three when the other two are known. The InstantTool calculator handles all three modes and uses km/h as the standard unit — useful for road travel planning, train/flight timing estimates and physics homework.
A square root of a number x is a value y such that y × y = x. Square roots appear in geometry, physics, statistics (standard deviation) and finance (volatility). The InstantTool calculator computes square, cube and any nth root with high precision.
Temperature conversions are essential when reading global weather forecasts (Fahrenheit), cooking with international recipes (Fahrenheit ovens) or working in science (Kelvin). The InstantTool temperature converter handles all three units accurately and instantly.
Weight conversions are needed for cooking (grams ↔ ounces), shipping (kg ↔ lb), travel (luggage limits) and fitness (kg ↔ lb plates). The InstantTool weight converter supports all common metric and imperial units side by side.
InstantTool's math calculators calculators are built specifically for Indian users — using the correct formulas, currency formatting (₹) and local context so you get results you can act on immediately. All tools are free, work without any signup and run entirely in your browser for privacy.
Whether you're a first-time user or a finance professional, our calculators make it easy to get accurate answers in seconds. Bookmark this page or share it with family and friends.