Solve everyday math and track health with |
Basic math for everyday use
Formula: Standard algebraic arithmetic operations (+, -, ×, /)
Explanation: Executes basic arithmetic sequencing.
Example: 5 * 4 + 3 = 23
Calculate your Body Mass Index
Formula: BMI = weight (kg) / [height (m)]²
Explanation: Calculates body mass index based on weight in kilograms and height in meters.
Example: 70kg / (1.75m)² = 22.86 (Normal weight)
Monthly payment with clear totals
Formula: EMI = P × r × (1 + r)^n / ((1 + r)^n - 1)
Explanation: P = Principal loan amount, r = Monthly interest rate (annual rate / 12 / 100), n = Loan tenure in months.
Example: 100,000 at 10% interest for 12 months = 8,791.59 monthly EMI.
Return on investment and net profit
Formula: ROI = (Final Value - Investment - Costs) / Investment * 100
Explanation: Measures the percentage gain or loss compared with the original amount invested.
Example: 10,000 invested, 12,500 final value, 500 costs = 20.00% ROI and 2,000 net profit.
Split bill, tip amount, and per-person share
Formula: Tip = Bill * Tip% | Each Pays = (Bill + Tip) / People
Explanation: Adds a selected gratuity percentage to the bill and splits the total evenly.
Example: 100 bill, 18% tip, 4 people = 18 tip, 118 total, 29.50 each.
Track your daily food intake
Formula: Total kcal = (Carbohydrates × 4) + (Protein × 4) + (Fat × 9)
Explanation: Calculates calories from grams of carbohydrates, protein, and fat.
Example: roti (100g) = 45g carbs, 9g protein, 1.5g fat = 229.5 kcal
Generate direct chat links
Formula: Water (Liters) = Weight (kg) × 0.033 × Activity Multiplier
Explanation: Computes optimal daily water requirements based on body mass and exercise rate (Light: 1.0, Moderate: 1.2, High: 1.5).
Example: 70kg with moderate activity = 70 × 0.033 × 1.2 = 2.77 Liters/day
Create QR codes for links or text
Formula: 2D Matrix Barcode Encoding Pattern
Explanation: Encodes character strings into structural patterns of black and white squares for visual reading.
Example: https://calculatorsallinone.com/ -> QR pattern
Create secure passwords
Formula: Pseudo-Random Selection: S = Random(Pool^Length)
Explanation: Selects characters uniformly from pools of lowercase, uppercase, numbers, and symbols.
Example: Length 12 with symbols -> k9$aB8#mZ!2Q
Convert common units
Formula: Target Value = Source Value × Conversion Factor
Explanation: Converts dimensions by multiplying a source unit value by its standard conversion ratio.
Example: 10 Meters to Feet = 10 × 3.28084 = 32.81 Feet
Base metabolic rate
Formula: Male: 10×W + 6.25×H - 5×A + 5 | Female: 10×W + 6.25×H - 5×A - 161
Explanation: Mifflin-St Jeor equation. W = Weight in kg, H = Height in cm, A = Age in years.
Example: Male, 30 years old, 70kg, 175cm = 1,643 kcal/day
Daily hydration needs
Formula: Water (Liters) = Weight (kg) × 0.033 × Activity Multiplier
Explanation: Computes optimal daily water requirements based on body mass and exercise rate (Light: 1.0, Moderate: 1.2, High: 1.5).
Example: 70kg with moderate activity = 70 × 0.033 × 1.2 = 2.77 Liters/day
Healthy weight range
Formula: Male: 50.0 + 2.3×((Height_cm / 2.54) - 60) | Female: 45.5 + 2.3×((Height_cm / 2.54) - 60)
Inches: Select Inches to use the entered height directly as Height_in.
Explanation: Devine Formula. Calculates standard ideal body weight from centimeters or inches based on height over 5 feet (60 in / 152.4 cm).
Example: Male of height 175cm (~69 in) = 50.0 + 2.3 × 9 = 70.7 kg
Daily protein needs
Formula: Protein (g) = Weight (kg) × Daily Ratio (g/kg)
Explanation: Determines daily protein needs (Sedentary: 0.8, Active: 1.2, Build Muscle: 1.6, Heavy Lifting: 2.0).
Example: 70kg active individual = 70 × 1.2 = 84 grams of protein/day
Estimate body fat percentage
Formula: Male: 495 / (1.0324 - 0.19077×log10(waist-neck) + 0.15456×log10(height)) - 450
Explanation: US Navy Circumference method. Uses log-scale measurements of waist, neck, and height (and hips for females).
Example: Male of height 175cm, neck 38cm, waist 88cm = 17.5% body fat
Estimate due date from LMP and cycle length
Formula: Due Date = LMP + 280 days + (Cycle Length - 28)
Explanation: Uses Naegele's rule with a cycle-length adjustment. It is an estimate, not medical advice.
Example: LMP 2026-01-01 with a 28-day cycle gives an estimated due date of 2026-10-08.
Systematic Investment Plan
Formula: Maturity = P × [ (1 + i)^n - 1 ] × (1 + i) / i
Explanation: P = Monthly investment, i = Monthly interest rate (annual / 12 / 100), n = Number of payments.
Example: 5,000 monthly for 10 years at 12% returns = 11,61,695 maturity value.
Fixed & Savings Deposit
Formula: Maturity = P × (1 + r / n)^(n × t)
Explanation: P = Principal amount, r = Annual rate, n = Compounding frequency per year (quarterly = 4), t = Time in years.
Example: 100,000 for 5 years at 7% interest compounded quarterly = 141,478 maturity.
Recurring Deposit
Formula: M = P × ((1 + r/n)^(n*t) - 1) / (1 - (1 + r/n)^(-1/3)) (approx)
Explanation: Computes maturity value of monthly recurring deposits compounding quarterly.
Example: 5,000 monthly for 24 months at 6.5% interest = 128,411 maturity.
Add or Remove GST
Formula: Add GST: Total = Base × (1 + rate/100) | Remove: Base = Total / (1 + rate/100)
Explanation: Computes goods and services tax either added to a price or extracted from an inclusive price.
Example: Base: 1,000 with 18% GST -> tax amount: 180, total: 1,180
Estimate in-hand salary
Formula: In-Hand Salary = Gross Salary - PF Deduction - Income Tax
Explanation: Estimates monthly take-home salary. PF is 12% of basic salary. Income Tax is based on basic slab estimates.
Example: Annual CTC of 1,200,000 (Basic 50%) -> monthly in-hand approx 83,000.
Calculate payable leave
Formula: Encashment = (Basic + DA) / 30 × Leave Days
Explanation: Calculates earned leave encashment value using monthly basic salary and number of accumulated leaves.
Example: Basic salary 60,000, 15 earned leaves = 30,000
Live exchange rates
Formula: Converted Value = Amount × Exchange Rate
Explanation: Multiplies your input value by the live currency exchange rate supplied by the API.
Example: 100 USD to EUR at rate 0.92 = 92.00 EUR
Calculate exact age
Formula: Age = Current Date - Date of Birth
Explanation: Calculates years, months, and days elapsed since your date of birth.
Example: DOB: 1998-05-20, Current: 2026-05-23 = 28 Yrs, 0 Mos, 3 Days
Days between two dates
Formula: Days = (End Date - Start Date) / (1000 × 60 × 60 × 24)
Explanation: Calculates total number of calendar days between two dates.
Example: 2026-05-01 to 2026-05-15 = 14 Days
Add/Subtract Time
Formula: Total Minutes = (Hours_1 × 60 + Mins_1) ± (Hours_2 × 60 + Mins_2)
Explanation: Adds or subtracts hours and minutes, displaying the total in standard time format.
Example: 2h 30m + 1h 45m = 4h 15m
Find percentage
Formula: Age = Current Date - Date of Birth
Explanation: Calculates years, months, and days elapsed since your date of birth.
Example: DOB: 1998-05-20, Current: 2026-05-23 = 28 Yrs, 0 Mos, 3 Days
Add, subtract, multiply, and divide fractions
Formula: a/b + c/d = (ad + bc) / bd; multiplication and division follow numerator/denominator rules.
Explanation: Computes the operation, reduces the result to simplest terms, and also shows the decimal value.
Example: 1/2 + 1/4 = 3/4 = 0.75.
Solve ax^2 + bx + c = 0
Formula: x = (-b +/- sqrt(b^2 - 4ac)) / 2a
Explanation: Finds real or complex roots using the discriminant of a quadratic equation.
Example: 1x^2 - 5x + 6 = 0 gives roots 2 and 3.
Calculate your grade point average
Formula: CGPA = ∑(Subject Credits × Grade Points) / ∑Subject Credits
Explanation: Calculates weighted Grade Point Average based on class credit weights and grades achieved.
Example: 3 Credits (Grade 9) + 4 Credits (Grade 8) = GPA 8.43
Plan your classes smartly
Formula: Required = (Target × Total - 100 × Attended) / (100 - Target)
Explanation: Calculates how many consecutive classes you must attend to achieve your target percentage.
Example: Attended: 30/40, Target: 75% -> Current is 75%, you need 0 more classes.
Analyze your text in real-time
Formula: Words = count(whitespaces), Chars = count(all letters)
Explanation: Analyzes text length by scanning whitespace delimiters for words and absolute string lengths for characters.
Example: 'Hello world' = 2 words, 11 characters
Format text instantly
Formula: String case conversions (toUpperCase, toLowerCase, etc.)
Explanation: Converts text between lower, upper, title, and camelCase formats dynamically.
Example: 'hello world' -> UPPER -> 'HELLO WORLD'
Secure string conversion
Formula: Base64 Binary-to-Text Encoding (RFC 4648)
Explanation: Converts strings to radix-64 ASCII representation or decodes them back to standard UTF-8 text.
Example: 'hello' -> Encode -> 'aGVsbG8='
Convert decimal, binary, hexadecimal, and octal
Formula: Decimal value = sum(digit * base^position)
Explanation: Parses the source number in its base and formats the integer into the selected destination base.
Example: Binary 1010 converts to decimal 10 and hexadecimal A.
Network, mask, broadcast, and usable hosts
Formula: Network = IP AND Mask | Broadcast = Network OR Wildcard
Explanation: Converts IPv4 addresses to 32-bit integers, applies the CIDR mask, and derives network limits.
Example: 192.168.1.10/24 gives network 192.168.1.0 and broadcast 192.168.1.255.
Scale width and height proportionally
Formula: New Height = New Width * Original Height / Original Width
Explanation: Preserves the same width-to-height proportion while scaling one dimension from the other.
Example: 1920 x 1080 scaled to width 1280 gives height 720.
HEX to RGB & HSL
Formula: HEX / RGB / HSL Conversion Formulas
Explanation: Translates colors between hexadecimal strings, RGB integers, and HSL degrees/percentages.
Example: #FFFFFF = rgb(255, 255, 255) = hsl(0, 0%, 100%)
Track your tasks
Formula: Elapsed = Active Epoch ms - Start Epoch ms
Explanation: Displays running duration of tasks down to millisecond precision.
Example: 00:01:23.45
Find the final price
Formula: Final = Price × (1 - Discount/100) × (1 + Tax/100)
Explanation: Calculates net price by applying percentage discount and then adding tax to the discounted sum.
Example: 1,000 price, 10% discount, 5% tax = 945.00 final price
Voltage x current = watts
Formula: Power (W) = Voltage (V) × Current (A)
Explanation: Ohm's formula for active electric power. W = Watts, V = Volts, A = Amperes.
Example: 230V × 5A = 1150 W
Units/kWh x rate = bill
Formula: Bill = Units (kWh) × Rate per Unit
Explanation: Calculates base power bills based on electrical energy consumed (kWh) and utility price.
Example: 250 units x 6 per unit = 1,500
Appliance watts x hours / 1000
Formula: kWh = Watts × Hours / 1000
Explanation: Computes total energy in Kilowatt-hours consumed by an appliance rating over hours used.
Example: 2000W AC for 8 hours = 16 kWh
Convert watts usage into units
Formula: Units (kWh) = Watts × Hours_per_day × Days / 1000
Explanation: Converts appliance wattage directly to total monthly utility billing units.
Example: 500W load for 12 hours/day for 30 days = 180 units
Daily usage to required panel size
Formula: Array Size (kW) = Daily Usage (kWh) / (Sun Hours × Efficiency)
Explanation: Determines required solar panel system size. Standard system efficiency is around 80% (0.80).
Example: 15 kWh daily usage, 5 sun hours, 80% efficiency = 3.75 kW array
Battery Ah, voltage, load watts
Formula: Backup (Hours) = (Battery Ah × Battery Voltage × Efficiency) / Load Watts
Explanation: Estimates operating time of inverter systems based on battery specs and active loads.
Example: 150Ah 12V battery under 300W load at 85% efficiency = 5.1 Hours backup
For PC and server load planning
Formula: Backup (Minutes) = (Battery Ah × Battery Voltage × Efficiency / Load Watts) × 60
Explanation: Estimates computer/server runtime. Efficiency factor typically ranges around 80% (0.80).
Example: 7Ah 12V battery under 100W load at 80% efficiency = 40.3 Minutes backup
Voltage, current, resistance, power
Formula: V = I × R | P = V × I
Explanation: Calculates electrical parameters. V = Voltage, I = Current, R = Resistance, P = Power.
Example: 12V Voltage with 2A Current = 6 Ohms Resistance
Total load watts to required kVA
Formula: kVA = Load Watts / (PF × 1000) × (1 + Safety Margin/100)
Explanation: Computes recommended generator capacity in apparent power (kVA) with standard safety buffer.
Example: 5000W load, 0.8 Power Factor, 25% safety margin = 7.81 kVA
Battery capacity x electricity rate
Formula: Cost = Battery Capacity (kWh) × (Charge Needed % / 100) × Unit Rate
Explanation: Calculates electric vehicle charging price based on capacity, current charge difference, and power rates.
Example: 40 kWh battery, charging from 20% to 100% (80% needed) at 8/unit = 256
Calculate area and boundary of a circle
Formula: Area = π × r² | Circumference = 2 × π × r
Explanation: Calculates circle boundary dimensions and surface area from its radius (r).
Example: Radius 7 -> Area = 153.94, Circumference = 43.98
Calculate area from base and height
Formula: Area = 0.5 × Base × Height
Explanation: Computes the enclosed area of any standard triangle.
Example: Base 10, Height 8 -> Area = 40
Solve a² + b² = c² for hypotenuse
Formula: Hypotenuse (c) = √(a² + b²)
Explanation: Calculates the longest side of a right-angled triangle given sides A and B.
Example: Side A = 3, Side B = 4 -> Hypotenuse = 5
Cube, sphere, and cylinder volume
Formula: Cube = s^3 | Sphere = 4/3*pi*r^3 | Cylinder = pi*r^2*h
Explanation: Select the 3D shape, enter the required dimensions, and get the enclosed volume.
Example: Cylinder with radius 3 and height 5 has volume 141.37 cubic units.
Interactive breakdown of famous equations
Live plot of linear equation y = mx + b
Formula: y = mx + b (Slope-Intercept Form)
Explanation: Plots a straight line graph representing slope (m) and y-intercept (b) values.
Example: m = 2, b = 5 -> y = 2x + 5
Convert images to PNG, JPG, or WEBP in-browser
Formula: In-browser canvas compression & export
Explanation: Uses the HTML5 Canvas API to load image matrices and export them in PNG, JPEG, or WEBP.
Example: upload JPG -> download WEBP
Generate v1 or v4 unique identifiers
Formula / Standard: RFC 4122 Standard
Explanation: UUID v4 uses 122 bits of random data, yielding 5.3×1036 combinations. UUID v1 combines timestamp and MAC address.
Example: f81d4fae-7dec-11d0-a765-00a0c91e6bf6
Convert and compare time zones easily
Formula: Timetarget = Timesource + Offsettarget - Offsetsource
Explanation: Timezones are defined relative to Coordinated Universal Time (UTC). Converting time requires adjusting by the difference in offsets.
Example: 12:00 PM IST (UTC+5.5) = 6:30 AM UTC = 1:30 AM EST (UTC-5)
Estimate fuel required and total road trip cost
Formula: L/100km = 100 / km/L, US MPG = km/L x 2.35215, UK MPG = km/L x 2.82481. Trip cost = distance / efficiency x unit price.
Explanation: Converts fuel efficiency between distance-per-fuel and fuel-per-distance formats, then estimates petrol, diesel, CNG, LPG, or EV energy cost.
Example: 20 km/L for 100 km uses 5.00 L. At 100 per L, trip cost is 500.
Advanced engineering & trigonometry math
Functions: standard operators, trigonometry (radians), logs, and power curves.
Explanation: Computes complex algebraic expressions adhering strictly to order of operations (BODMAS/PEMDAS).
Example: sin(pi/2) = 1, 2^3 = 8, 5! = 120
Generate professional, exportable invoices
Formula: Subtotal = ∑(Qty × Price) | Tax = Subtotal × TaxRate | Discount = Subtotal × DiscountRate | Total = Subtotal + Tax - Discount
Explanation: Multiplies each line item quantity by its rate, aggregates the sum, applies the tax percentage, subtracts the discount percentage, and provides the final due amount.
Try searching for EMI, BMI, currency, QR, password, or electricity.
Calculator guide
Calculators All In One is a free online utility website for people who want quick, clear, and practical answers without opening spreadsheets or installing apps. The site brings finance calculators, health estimators, math helpers, electricity planning tools, geometry formulas, graphing utilities, QR tools, password tools, and text utilities into one place. Each tool is designed for fast input, instant output, and enough explanation to help you understand the result instead of simply copying a number.
Finance tools help you estimate loan EMIs, total interest, GST, SIP maturity, discounts, tax-inclusive prices, salary breakdowns, and currency conversion. Use them when comparing loan options, planning monthly budgets, estimating investment goals, or checking how much a purchase costs after tax. These calculators are useful when you want a transparent breakdown of principal, rate, time, total payable amount, and final value.
Health calculators such as BMI, BMR, calorie, protein, water intake, ideal weight, and body fat estimators provide quick wellness reference points. They are not medical advice, but they can help you start a conversation about weight, nutrition, hydration, and daily activity. The goal is to make common health numbers easier to understand while reminding users that personal context matters.
Math tools cover everyday arithmetic, percentages, age, date difference, time duration, unit conversion, CGPA, attendance, and scientific calculations. These are built for students, teachers, office workers, shop owners, and anyone who needs a reliable shortcut for routine calculations. You can use them to check homework, compare values, calculate changes, convert units, and avoid manual mistakes.
Power and electricity calculators help estimate electricity bills, appliance energy use, kWh consumption, watts to units, inverter backup, UPS runtime, solar panel requirements, generator sizing, Ohm's law, and EV charging cost. These tools are useful before buying appliances, planning backup power, checking monthly power consumption, or comparing solar and battery options for homes and small offices.
Geometry tools make shape formulas faster to use. Circle, triangle, and Pythagorean calculators help with area, circumference, side lengths, and basic measurement planning. They are useful for students, builders, designers, and DIY users who need a quick formula check while working with measurements.
The graphing and equation tools help you explore expressions visually and understand how formulas behave. They are useful for learning algebra, checking curves, explaining concepts, and turning abstract equations into visual patterns. A graph is often easier to understand than a line of numbers, especially for students and self-learners.
Daily tools include QR code generation, password generation, word count, case conversion, Base64 tools, color tools, stopwatch, UUID generation, image conversion, timezone tools, invoice generation, and mileage cost estimation. These small utilities save time during work, study, travel, content creation, and web tasks.
Every calculator on this site is built around clarity. Inputs are labeled, results are shown immediately, and many tools include formula notes, examples, and category filters so you can understand the result. The website is mobile responsive, so you can calculate from a phone while shopping, studying, traveling, or discussing a plan with someone. The tools are also grouped by purpose, which makes it easier to find a finance calculator, a health calculator, a power calculator, or a daily utility without searching the web again.
Another benefit is transparency. A number is only useful when you know what it means. That is why the site explains formulas, assumptions, and practical limits wherever possible. Finance results are estimates, health outputs are educational, and electricity tools depend on the values you enter. This honest approach helps you use the calculators confidently while still checking official sources for final decisions.
FAQ
Yes. The calculators and daily tools are free to use in your browser, and most tools do not require login or account registration.
Most calculations run in the browser. We do not ask for personal accounts for normal calculator use, and you should avoid entering sensitive private data into any public online tool.
Use finance results as planning estimates. Banks, lenders, tax departments, and investment platforms may use different fees, dates, rates, or rules.
No. Health tools such as BMI are educational screening tools. Consult a qualified health professional for diagnosis, treatment, or personal medical advice.
Popular tools include EMI, BMI, percentage, age, SIP, GST, currency conversion, password generation, QR code generation, electricity bill, and scientific calculator tools.
Yes. The website is designed for phones, tablets, laptops, and desktop screens with responsive layouts and touch-friendly inputs.
Real-world results can depend on bank rules, tax slabs, exchange-rate timing, health profile, device efficiency, and other variables. The calculators show transparent estimates based on stated inputs.
Use the Contact Us page or email support.aiagents@gmail.com with the calculator idea, formula, and example inputs you want supported.