Math Calculators
Percentage, ratio, scientific, statistics, age, date difference — every common math calculation, instantly, with worked examples and step-by-step breakdowns.
General-purpose math calculators — percentage, ratio, age, date difference, average, discount, tip — for the everyday calculations that show up in shopping, scheduling, and basic financial planning. Fast, exact, and free of the noise that comes with full-fledged calculator apps.
Math
Percentage Calculator
Calculate percentages every way: what % of a number, percentage change, increase/decrease, and reverse percentage.
Open calculatorAge Calculator
Calculate your exact age in years, months, days, hours, and minutes from your date of birth to any date.
Open calculatorDiscount Calculator
Calculate the final price after a percentage discount, or find the discount percentage given two prices.
Open calculatorDate Difference
Calculate the exact number of years, months, weeks, days, hours, and business days between two dates — for age, tenure, deadlines, and project planning.
Open calculatorAverage (Mean) Calculator
Calculate the mean, median, mode, sum, and count from a list of numbers. Just paste or type your values.
Open calculatorRatio Calculator
Simplify ratios, scale them up or down, or solve for a missing value in a proportion (A:B = C:D) — handy for recipes, mixing, finance, and design work.
Open calculatorTip Calculator
Calculate the right tip and split the bill across people. Choose tip percentage and number of diners.
Open calculatorWhat's here
Percentage calculator (X is what % of Y, X% of Y, percent change), ratio (simplify, scale, compare), discount (final price after percentage off), tip (split bill across diners), average (mean, median, mode of a list).
Date and age — exact age in years/months/days, date difference, future/past date offset. Useful for school admission age (a separate calculator with India-specific cutoff dates), retirement countdown, and other life-event planning.
When to use these
Most everyday math calculations are simple but error-prone — humans are bad at percentage arithmetic, especially when retail discounts compound or change reference points. The calculator does the math reliably; you focus on understanding the result.
All calculators here run in the browser, no signup required. Bookmark the most-used ones (percentage, age) for instant access from your phone.
Frequently asked questions
How do I calculate a discount?
Discounted price = original price × (100 − discount %) / 100. Example: 30% off ₹2,500 = ₹2,500 × 70 / 100 = ₹1,750. The discount calculator handles compound discounts (10% + further 5%), GST add-on, and final-price-to-original-price reverse calculation.
How is age calculated exactly?
Age = current date minus birth date, expressed as completed years, then remaining months, then remaining days. The age calculator uses calendar arithmetic (not 365-day approximations), so leap years, varying month lengths, and end-of-month edge cases are handled correctly.
What's the difference between mean, median, and mode?
Mean is the arithmetic average (sum ÷ count). Median is the middle value when sorted. Mode is the most frequent value. They give different answers when data is skewed — for income, the mean is pulled high by outliers, but the median better represents 'typical'. The average calculator computes all three.
How is the school admission age calculated?
Indian schools typically have an age cutoff date (usually April 1 or June 1 depending on state board), and require the child to be a minimum age (usually 5+ for Class 1) on that date. The school admission age calculator handles state-specific cutoffs and tells you the exact age at admission.
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