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385 calculators
SIP Calculator
Monthly mutual-fund SIP returns
OpenLumpsum Calculator
One-time investment growth
OpenEMI Calculator
Monthly loan installment
OpenSimple Interest
Flat interest calculation
OpenCompound Interest
Power of compounding
OpenFD / RD Calculator
Fixed & recurring deposits
OpenPPF Calculator
Public provident fund
OpenCurrency Converter
FX between major currencies
OpenGST Calculator
Inclusive / exclusive GST
OpenProfit & Loss
Trading & business margins
OpenDiscount Calculator
Sale-price savings
OpenSalary Calculator
CTC to in-hand
OpenIncome Tax
Old vs new tax regime
OpenMortgage
Home loan EMI & total interest
OpenRetirement Planner
Corpus you need
OpenROI Calculator
Return on investment
OpenNPS Calculator
National pension scheme
OpenCAGR Calculator
Compound annual growth rate
OpenHRA Calculator
House rent allowance exemption
OpenGratuity
End-of-service gratuity
OpenEPF Calculator
Employee provident fund
OpenHome Loan vs Rent
Buy vs rent comparison
OpenNet Worth
Assets minus liabilities
OpenBreak-Even
Break-even point
OpenAmortization Schedule
Month-by-month loan breakup
OpenMortgage Payoff
Extra-payment savings
OpenRefinance Calculator
Break-even on refinance
OpenHouse Affordability
Max loan + max price
OpenRent Affordability
Max rent by income
OpenDown Payment
Down + LTV
OpenRent vs Buy (NPV)
Long-horizon NPV comparison
OpenAPR (with fees)
True APR including upfront fees
OpenAuto Loan
Car EMI
OpenAuto Lease
Lease monthly payment
OpenCredit Card Payoff
Months to clear + interest
OpenCredit Card Min Payment
Min-payment trap simulator
OpenDebt Snowball
Pay-off speed
OpenDebt Consolidation
Saving by consolidating
OpenDTI Ratio
Debt-to-income with verdict
OpenStudent Loan
Education EMI
OpenCollege Cost
Future cost inflated
OpenPayback Period
Years to recover investment
OpenNPV
Net present value
OpenIRR
Internal rate of return
OpenPresent Value
PV of future amount
OpenFuture Value
FV of present amount
OpenAnnuity FV
Future value of periodic payments
OpenAnnuity Payout
Monthly payout from corpus
OpenBond Pricing
Bond price from coupon + YTM
OpenMutual Fund Returns
Absolute + CAGR from NAVs
OpenInflation Calculator
Future cost / real value
OpenSales Tax
Tax + total
OpenVAT Calculator
Inclusive/exclusive VAT
OpenTip Calculator
Tip + per person
OpenCommission
Sales commission
OpenMargin / Markup
Profit, margin %, markup %
OpenDepreciation
SL / DDB / SYD methods
OpenBudget Calculator
Income/expense → savings rate
OpenPension Planner
Corpus + monthly payout
OpenOld-Age Benefit
Estimated monthly benefit
OpenEquipment Lease
Generic lease payment
OpenBusiness Loan EMI
Business loan
OpenPersonal Loan EMI
Unsecured personal loan
OpenBike / Boat Loan
Two-wheeler / boat loan
OpenSavings Goal
Monthly savings needed
OpenInterest Rate Solver
Back-solve rate from EMI
OpenTenure Solver
Back-solve tenure
OpenNSC
National Savings Certificate
OpenKVP
Kisan Vikas Patra
OpenSukanya Samriddhi
SSY 21-yr maturity
OpenAtal Pension Yojana
Pension by 60
OpenSenior Citizens Saving
SCSS quarterly payout
OpenPost Office MIS
POMIS monthly payout
OpenEPF Final Settlement
EPF at retirement
OpenNPS Withdrawal
60% lump + 40% annuity
OpenLTCG (Equity)
Long-term equity gains tax
OpenSTCG (Equity)
Short-term equity gains tax
OpenProperty Capital Gains
Indexed LTCG @20%
OpenAdvance Tax
Quarterly instalments
OpenTDS Calculator
Tax deducted at source
OpenSection 80C
Tax saver summary
OpenOld vs New Regime
Side-by-side tax compare
OpenForm 16 In-Hand
Annual + monthly take-home
OpenXIRR
Annualized IRR for irregular flows
OpenSWP
Systematic withdrawal lifespan
OpenSTP
Systematic transfer plan
OpenELSS Tax Saver
ELSS maturity + tax saved
OpenStep-up SIP
SIP with annual hike
OpenSovereign Gold Bond
SGB maturity + 2.5% interest
OpenStamp Duty
Property stamp + registration
OpenBrokerage / F&O
STT + GST + brokerage
OpenBasic Calculator
Everyday arithmetic
OpenScientific Calculator
Trig, log, exp
OpenPercentage
Percent of, increase, decrease
OpenFraction Calculator
Add / multiply fractions
OpenNumber System
Bin / oct / dec / hex
OpenPrime Checker
Is N prime? + factors
OpenGCD / LCM
Greatest common divisor / LCM
OpenStatistics
Mean, median, mode, stddev
OpenMatrix Calculator
Add / multiply / determinant
OpenQuadratic Solver
Roots of ax² + bx + c
OpenLogarithm
log_b(x) with base picker
OpenPermutation & Combination
nPr and nCr
OpenStandard Deviation
σ, variance, mean
OpenVariance
σ² of a list
OpenMean / Median / Mode
All four basics
OpenZ-Score
Standardized value
OpenConfidence Interval
CI for a mean
OpenSample Size
Survey n calculation
OpenProbability
Basic probability + odds
OpenAP / GP / Fibonacci
Sequence terms + sum
OpenPercent Error
Expected vs actual
OpenPercent Change
Old to new
OpenExponent / Power
b^e
Openn-th Root
x^(1/n)
OpenScientific Notation
Number → mantissa × 10ⁿ
OpenRounding
Round / floor / ceil
OpenHalf-Life
Decay formula
OpenPythagorean
c = √(a² + b²)
OpenRight Triangle
Sides + angles + area
OpenTriangle (general)
Heron's formula
OpenSlope & Intercept
From two points
OpenDistance (2D)
Between two points
OpenCircle
Area, circumference
OpenArea (shapes)
Multi-shape area
OpenVolume (shapes)
Multi-shape volume
OpenSurface Area (shapes)
Multi-shape surface
OpenRatio Simplifier
Reduce a:b:c by GCD
OpenProportion Solver
a/b = c/x
OpenRandom Number Generator
Range + count
OpenDice Roller
N-sided dice, multi-roll
OpenTriangle (full)
All sides + angles
OpenRight Triangle
Two legs → hyp + area
OpenEquilateral Triangle
Area + height
OpenPythagorean Theorem
c² = a² + b²
OpenCircle
Area, circ, diameter
OpenEllipse
Area + perimeter
OpenSquare
Side → area, diagonal
OpenRectangle
L×W → area, perimeter, diag
OpenParallelogram
Base × height
OpenTrapezoid
(a+b)·h / 2
OpenRegular Polygon
n sides + side length
OpenCube
Volume + surface
OpenCuboid
L × W × H
OpenSphere
4/3·π·r³
OpenCylinder
π·r²·h
OpenCone
π·r²·h/3
OpenPyramid
Base² × h / 3
OpenTorus
Donut volume + surface
OpenBMI Calculator
Body mass index
OpenBMR Calculator
Basal metabolic rate
OpenCalorie Needs
TDEE & daily calories
OpenBody Fat %
US Navy method
OpenIdeal Weight
Healthy weight range
OpenWater Intake
Daily hydration goal
OpenPregnancy Due Date
EDD & trimester
OpenMacro Splitter
P/C/F split
OpenHealthy Weight Range
BMI 18.5–25 by height
OpenLean Body Mass
Boer formula
OpenArmy/Navy Body Fat
US Navy log eqn
OpenOne Rep Max (1RM)
Epley / Brzycki / Lombardi
OpenTarget Heart Rate
Karvonen zones
OpenMax Heart Rate
220 − age
OpenCalories Burned
By activity (MET)
OpenRunning Pace
Min/km + speed
OpenPace Predictor
Riegel formula
OpenVO₂ Max
Cooper 12-min test
OpenBody Surface Area
Du Bois formula
OpenSomatotype
Ecto/meso/endo
OpenCarbohydrate Intake
g/day
OpenProtein Intake
By body weight & activity
OpenFat Intake
g/day
OpenTDEE
Total daily expenditure
OpenCalorie Goal
Cut / maintain / bulk
OpenPregnancy Weight Gain
By pre-BMI
OpenOvulation / Fertility
Fertile window
OpenPeriod Tracker
Next period date
OpenSleep Calculator
90-min cycle bedtimes
OpenBlood Alcohol
Widmark BAC
OpenGFR (kidney)
Estimated GFR + CKD stage
OpenSteps to Calories
Pedometer kcal
OpenAge Calculator
Years, months, days
OpenDate Difference
Days between two dates
OpenAdd / Subtract Days
Date arithmetic
OpenWorking Days
Business days between dates
OpenTime Zone Converter
Multiple zones
OpenTime Calculator
Add / subtract hh:mm
OpenTime Card / Timesheet
Weekly hours + OT
OpenHours Between Times
Duration
OpenDay of Week
Mon..Sun for a date
OpenDay Counter
Days between dates
OpenCountdown
Days/h/m to target
OpenStopwatch
Elapsed time formatter
OpenPomodoro Timer
Session + breaks total
OpenGestational Age
Weeks pregnant
OpenCrypto Profit
Entry → exit profit/loss
OpenStaking Yield
APY rewards projection
OpenDollar-Cost Averaging
DCA simulation
OpenStock Average
Average price calc
OpenP/E Ratio
Price-earnings ratio
OpenPosition Size
Risk-based size
OpenCrypto Tax India
30% + 1% TDS
OpenMining Profit
Hash + power → profit
OpenImpermanent Loss
LP vs hold
OpenAPY ↔ APR
Convert between APY and APR
OpenLiquidation Price
Margin trade liq
OpenLeverage / Margin
Effective leverage
OpenRisk:Reward
Trade R:R
OpenPip Value (Forex)
Per-lot pip $
OpenForex Position Size
Lots from risk
OpenStock Brokerage (India)
Full charges + net PnL
OpenStock Profit
Qty × (sell − buy)
OpenStop Loss
From account risk
OpenTake Profit
From R:R
OpenEPS / Book Value
Per-share fundamentals
OpenLength
m, ft, mi, km, in...
OpenMass / Weight
kg, lb, oz, g...
OpenTemperature
°C, °F, K
OpenArea
m², ft², acre...
OpenVolume
L, gal, m³...
OpenSpeed
km/h, mph, m/s...
OpenTime Units
sec, min, hr, day...
OpenData Storage
B, KB, MB, GB, TB
OpenEnergy
J, kWh, cal...
OpenPressure
Pa, bar, psi, atm
OpenAngle
deg / rad / grad
OpenForce
N, lbf, kgf
OpenTorque
Nm, lb·ft
OpenPower
W, kW, hp, BTU/hr
OpenFrequency
Hz, kHz, RPM
OpenFuel Economy
mpg ↔ km/L
OpenDensity
kg/m³, g/cm³, lb/ft³
OpenAcceleration
m/s², ft/s², g
OpenMagnetic Flux
Weber / Maxwell
OpenCurrent
A, mA, µA
OpenVoltage
V, mV, kV
OpenResistance
Ω, kΩ, MΩ
OpenCapacitance
F, μF, nF, pF
OpenRoman Numeral
Decimal ↔ Roman
OpenNumber to Words
12345 → words
OpenIndian Number System
Lakh / crore
OpenShoe Size
US/UK/EU/JP
OpenClothing Size
XS–XXL
OpenRing Size
mm ↔ US/UK
OpenBra Size
EU sizing
OpenConcrete (slab)
L × W × D + cement bags
OpenConcrete (column/footing)
Round or rect
OpenCement / Sand / Aggregate
Mix ratio breakdown
OpenMortar / Plaster
Wall area + thickness
OpenBrick Count
Wall l × h × t
OpenBlock Count
By block size
OpenTile Calculator
Room + waste %
OpenFlooring
Planks needed
OpenCarpet
Length + strips
OpenPaint Calculator
Coats + coverage
OpenWallpaper
Rolls needed
OpenRoofing (shingles)
Roof area
OpenRoof Pitch
Rise/run → angle
OpenDrywall
Sheets needed
OpenLumber (Board Feet)
Qty × t × w × l / 12
OpenStud Wall Framing
Studs per wall
OpenRebar
Slab grid + total length
OpenStair Calculator
Steps + tread depth
OpenMulch / Topsoil
Volume m³
OpenGravel
Volume + weight
OpenFence
Posts + panels
OpenPool Volume / Fill
Volume + litres
OpenFuel Cost
Trip cost from km + price
OpenMileage (km/L)
Distance / fuel used
OpenTrip Cost (multi-leg)
Sum of all legs
OpenHorsepower
Torque × RPM
OpenEngine Displacement
Bore, stroke, cyl → cc
OpenTire Size
205/55R16 → diameter
OpenAverage Speed
Distance / time
OpenTravel Time
Distance / speed
OpenLap Time / Race Pace
Track + total time
OpenToll Estimator
₹ by distance + class
OpenEV Charging Cost
Battery × rate / eff
OpenEV vs Petrol
Annual cost comparison
OpenForce (F = ma)
Newton's 2nd law
OpenNewton's 2nd (solver)
Solve for any of F, m, a
OpenWeight (mg)
On Earth / Moon / Mars
OpenKinetic Energy
½·m·v²
OpenPotential Energy
m·g·h
OpenWork (F·d·cos θ)
Work done
OpenPower (W/t)
Power
OpenMomentum
p = m·v
OpenImpulse
J = F·t
OpenVelocity (v = u + at)
Kinematics
OpenAcceleration
Δv / t
OpenFree Fall
Time + impact velocity
OpenProjectile Motion
Range, height, flight
OpenFriction Coefficient
μ = F/N
OpenPressure
F / A
OpenDensity
m / V
OpenBuoyancy
ρ·V·g
OpenOhm's Law
V, I, R + P
OpenElectrical Power
P = V·I
OpenResistor Network
Series / parallel
OpenCapacitor Network
Series / parallel
OpenWave Equation
λ = v/f
OpenDoppler Effect
Frequency shift
OpenPendulum Period
2π·√(L/g)
OpenHooke's Law (spring)
F = k·x
OpenMolarity
mol/L
OpenMolality
mol/kg
OpenMolar Mass
From formula
OpenMoles ↔ Mass ↔ Atoms
Convert between three
OpenMass Percent
% w/w
OpenDilution (M₁V₁=M₂V₂)
Solve for final volume
OpenpH / pOH
From [H⁺]
OpenBuffer (Henderson-H)
Buffer pH
OpenIdeal Gas (PV=nRT)
Moles from P, V, T
OpenBoyle / Charles
Gas law variants
OpenHalf-Life (radioactive)
Decay over time
OpenEmpirical Formula
From mass %
OpenAvogadro / Mole
Atoms ↔ moles
OpenDensity (chem)
m / V
OpenSolution Concentration
mg/L ↔ ppm ↔ %
OpenOhm's Law (full)
Solve for V, I, R or P
OpenResistor Color Code
4-band → resistance
OpenResistor (reverse)
Resistance → colors
OpenVoltage Drop
Wire length + gauge
OpenWire Gauge (AWG)
By current + length
OpenLED Series Resistor
Vs − Vled / I
OpenRC Time Constant
τ = R·C
OpenRL Time Constant
τ = L/R
OpenDecibel (dB)
Power or voltage ratio
OpenPower Factor
Real / apparent
OpenBattery Life
mAh ÷ mA
OpenSolar Panel Sizing
Daily load × sun-hours
OpenRecipe Scaler
Servings new/old
OpenCups ↔ Grams
By ingredient
OpenTbsp ↔ tsp ↔ ml
Volume conversions
OpenOven Temp
°C ↔ °F ↔ Gas Mark
OpenBaking Pan Conversion
Area ratio
OpenCooking Time
By meat + weight
OpenBread (yeast / sugar / water)
From flour weight
OpenCoffee Ratio
1:N brew ratio
OpenAlcohol ABV
OG / FG → ABV
OpenMacros per Recipe
Per-serving macros
OpenGPA
4.0 / 10.0 scale
OpenCGPA ↔ %
Convert CGPA to percentage
OpenExam Grade Needed
To hit target final %
OpenExam Score Predictor
With negative marking
OpenTip Calculator
Tip + total
OpenSplit Bill
Per-person with tip
OpenLove Compatibility (fun)
Name-based
OpenName Numerology
Destiny number
OpenAge in Days/Hours
Exact units
OpenZodiac Sign
From DOB
OpenChinese Zodiac
From birth year
OpenWedding Anniversary
Years + symbol
OpenRetirement Countdown
Years until retire
OpenCarbon Footprint
Tonnes CO₂/yr
OpenWater Footprint
L/day
OpenIP Subnet (CIDR)
Mask, hosts, broadcast
OpenSubnet Mask Converter
Dotted ↔ CIDR
OpenMAC Address Lookup
OUI vendor (offline)
OpenBase64 Encode/Decode
Text ↔ Base64
OpenURL Encode/Decode
Percent encoding
OpenHTML Entity
< > & encoding
OpenHash Generator
SHA-1/256/384/512
OpenUUID Generator
v4 UUIDs
OpenPassword Generator
Length + charset
OpenPassword Strength
Entropy verdict
OpenRandom String
Charset + length
OpenBandwidth / Download Time
File size ÷ speed
OpenColor Converter
HEX ↔ RGB ↔ HSL
OpenCron Expression Helper
Minutes/hours fields
OpenWind Chill
Apparent temp from wind
OpenHeat Index
Feels-like w/ humidity
OpenDew Point
Temp + humidity
OpenHumidity (RH ↔ abs)
Relative ↔ absolute
OpenUV Exposure
Time to burn
OpenSunrise / Sunset
Lat/lon → times
OpenMoon Phase
Phase + illumination
OpenCricket Run Rate
RPO
OpenCricket Required RR
Chase math
OpenCricket DLS (simplified)
Revised target
OpenCricket Stats
Strike rate, avg, economy
OpenGolf Handicap
From recent scores
OpenBowling (10-pin) Score
Frame total
OpenDarts Checkout
From remaining score
OpenFantasy Cricket Points
Runs + wickets + catches
Open