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59 calculators · 9 categories

NumberOne
Calc

Every calculation you need, in one place. Type your numbers, get the answer and the working — nothing reloads, nothing is stored on our side.

Today's tape

EMI on ₹5,00,000 for 5 years at 9.5%

₹ 10,501 / month

EMI BMI Percentage GST Scientific

Finance

Loans, EMIs, investments, tax and everyday money maths.

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EMI Calculator Monthly instalment, total interest and total repayment for any loan.
Loan Calculator Full cost of borrowing, including processing fee and net disbursal.
Mortgage Calculator Home loan payment including property tax and insurance escrow.
SIP Calculator Future value of a monthly investment plan, with optional annual step-up.
Compound Interest Growth of a deposit with any compounding frequency and regular top-ups.
Simple Interest Interest and maturity value on a flat, non-compounding rate.
Investment Return Total return, annualised CAGR and growth multiple of any investment.
GST Calculator Add or remove GST and see the CGST/SGST split.
Salary Calculator Turn annual CTC into monthly in-hand pay after standard deductions.
Discount Calculator Sale price after a percentage off, a flat coupon and tax.
Tip Calculator Tip amount, total bill and each person's share.
Currency Calculator Convert currencies with an editable rate and a fee allowance.

Health

Body measurements, energy needs and daily targets.

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BMI Calculator Body mass index, category and the healthy weight range for your height.
BMR Calculator Calories your body burns at rest, plus daily expenditure by activity.
Calorie Calculator Daily calorie target for your goal, with a macro breakdown.
Age Calculator Exact age in years, months and days, plus your next birthday.
Ideal Weight Calculator Ideal body weight from four formulas, plus your healthy BMI range.
Water Intake Calculator Daily water target from weight, exercise and climate.

Math

Percentages, fractions, ratios, statistics and a scientific keypad.

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Percentage Calculator Percent of a number, one number as a percent of another, and percent change.
Fraction Calculator Add, subtract, multiply or divide fractions with simplified output.
Ratio Calculator Simplify a ratio and divide a total in that proportion.
Average Calculator Mean, median, mode, range and standard deviation of any list.
Scientific Calculator Full keypad with trigonometry, logs, powers, roots and memory.
Random Number Generator Random whole numbers in any range, unique or repeating.

Date & Time

Ages, gaps between dates, durations and countdowns.

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Age Calculator Exact age in years, months and days, plus your next birthday.
Date Difference Gap between two dates in years, months, days and more.
Days Between Dates Total days between dates, split into weekdays and weekends.
Time Difference Duration between two times, minus breaks, in decimal hours too.
Countdown Calculator Live countdown of days, hours, minutes and seconds to any moment.
Working Days Calculator Business days between dates, with week-offs and holidays.

Conversion

Convert length, weight, temperature, data and seven more unit families.

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Length Converter Millimetres to miles across nine length units.
Weight Converter Grams to stones across seven mass units.
Temperature Converter Celsius, Fahrenheit and Kelvin in any direction.
Area Converter Square feet, square metres, acres, hectares and more.
Volume Converter Litres, gallons, cups and cubic measures.
Speed Converter km/h, mph, m/s, ft/s and knots.
Data Storage Converter Bits to petabytes, decimal and binary units both.
Time Converter Milliseconds to years across eight time units.
Energy Converter Joules, calories, kWh, BTU and foot-pounds.
Pressure Converter PSI, bar, pascal, atmosphere, mmHg and torr.

Daily Life

Fuel, electricity, shared bills and kitchen measures.

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GST Calculator Add or remove GST and see the CGST/SGST split.
Fuel Cost Calculator Cost of a trip in fuel, plus litres used and cost per km.
Electricity Bill Calculator Units consumed and running cost for any appliance.
Split Bill Calculator Divide a bill with tip, tax and an optional extra share.
Cooking Unit Converter Cups, spoons, grams and ounces, by ingredient density.

Education

GPA, grades, marks and attendance for school and college.

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GPA Calculator Combine a previous CGPA with a new semester GPA, weighted by credits.
CGPA to Percentage Calculator Convert a CGPA out of 10 to an equivalent percentage.
Percentage to CGPA Calculator Convert a percentage score to an equivalent CGPA out of 10.
Marks Percentage Calculator Percentage and an indicative grade from marks obtained and total marks.
Final Grade Calculator The score you need on a final exam to hit your target overall grade.
Attendance Calculator How many classes you can still miss, or must attend, to hit a target percentage.

Home & DIY

Paint, tiles, concrete and flooring for a renovation project.

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Paint Calculator Litres of paint needed for a room, by dimensions and coats.
Tile Calculator Number of tiles needed for a floor, with a wastage allowance.
Concrete Calculator Concrete volume for a slab, plus an estimated bag count.
Wallpaper Calculator Rolls of wallpaper needed for a room, with a pattern-match allowance.
Flooring Cost Calculator Total flooring material cost from room size and price per square metre.

Sports & Fitness

Running pace, calories burned, lifting and heart rate targets.

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Running Pace Calculator Pace per km, pace per mile and average speed from distance and time.
Calories Burned Calculator Estimated calories burned for common activities, by weight and duration.
One Rep Max Calculator Estimated one-rep max from a lifted weight and rep count, plus a training load table.
Target Heart Rate Calculator Moderate and vigorous heart rate training zones from age and resting heart rate.
Steps to Distance & Calories Distance walked and estimated calories burned from a step count.

Built to be quick

Answers without reloading

Every calculation runs in your browser, so results appear as fast as you can type. Nothing you enter is sent anywhere.

The working, not just the number

Each page shows the formula, a worked example and a breakdown, so you can check the result rather than trust it blindly.

Yours to keep handy

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