All tools A–Z
Every calculator and converter on OmniCalc, grouped by category. Calculators come first, then each unit-conversion system. Pick a tool — it computes an example the moment it loads, then you just edit the numbers.
60 Calculators86 Unit converters
Calculators
Finance
- Compound Interest CalculatorFuture value with monthly contributions, yearly growth breakdown and chart-ready data.
- Loan CalculatorMonthly payment, total interest and the full amortization schedule.
- Mortgage CalculatorMonthly payment, total interest and full cost of a home loan — with tax and insurance.
- Currency ConverterLive exchange rates for 160+ currencies, plus NBG official rates.
- Tip CalculatorTip amount, total and an even split per person for any bill.
- Discount CalculatorSale price and the amount you save from any percentage off.
- Salary CalculatorConvert one pay figure into hourly, weekly, monthly and annual pay via an annual pivot.
- Sales Tax CalculatorAdd sales tax or VAT to a price, or back it out of a tax-inclusive total.
- Simple Interest CalculatorInterest earned and final balance with I = P × r × t — no compounding.
- ROI CalculatorReturn on investment from an initial and final value, plus annualized CAGR.
- Savings CalculatorThe monthly deposit needed to reach a savings goal by a target date, with interest.
- VAT CalculatorAdd VAT to a net price or remove VAT from a gross price at any rate, defaulting to Georgia's 18% standard, with a net / VAT / gross breakdown.
- Margin CalculatorEnter cost and revenue to get profit, profit margin % and markup % — currency-neutral.
- Inflation CalculatorHow inflation erodes purchasing power over time — or the future amount to keep value.
Health
- BMI CalculatorBody mass index with WHO category and healthy weight range for your height.
- BMR & Calorie CalculatorBasal metabolic rate (Mifflin-St Jeor) and daily calorie needs by activity level.
- Body Fat CalculatorBody fat percentage from tape measurements using the US Navy method.
- Due Date CalculatorEstimate a pregnancy due date, weeks along and trimester from your last period.
- Pace CalculatorRunning pace per km and per mile, plus speed, from a distance and a time.
- Ideal Weight CalculatorIdeal body weight by the Devine, Robinson, Miller and Hamwi formulas.
- TDEE CalculatorTotal Daily Energy Expenditure: BMR (Mifflin-St Jeor) times an activity factor, giving the calories you burn per day.
- Water Intake CalculatorEstimate a daily water target from your weight and exercise — about 33 ml per kg, plus a bump for activity.
- Macronutrient CalculatorSplit a daily calorie target into grams of protein, carbs and fat — enter your calories and the percentage for each macro.
Math
- Percentage CalculatorX% of Y, percent change and percent difference — with worked steps.
- Fraction CalculatorAdd, subtract, multiply or divide two fractions — answer in lowest terms plus a decimal.
- Percentage Change CalculatorEnter an initial (V₁) and final (V₂) value to get the signed percentage change between them — the calculator shows whether it is an increase or a decrease and reveals the full working.
- Average CalculatorMean, median, mode, range and more for any list of numbers.
- Ratio CalculatorSimplify a ratio to lowest terms or solve a proportion for the missing value.
- Pythagorean Theorem CalculatorSolve a right triangle (a² + b² = c²) from any two sides, with area and perimeter.
- Circle CalculatorRadius, diameter, circumference and area of a circle from any one measurement.
- Exponent CalculatorEnter a base and an exponent to compute base ^ exponent — whole, negative and fractional powers are all supported, with the working shown.
- Quadratic Formula CalculatorSolve ax² + bx + c = 0 — real or complex roots, the discriminant and worked steps.
- Speed, Distance & Time CalculatorSolve for speed, distance or time given the other two.
- Rounding CalculatorRound a number to any decimal place — to the nearest, up or down.
- GCF & LCM CalculatorGreatest common factor and least common multiple of any list of whole numbers.
- Scientific Notation ConverterConvert any number to scientific notation m × 10^n — mantissa, exponent and E-notation, with the working shown.
Statistics
- Standard Deviation CalculatorPopulation and sample standard deviation, variance and mean for a data set.
- Probability CalculatorCombine two independent events — both, either, neither or exactly one.
- Combinations & Permutations CalculatorCalculate combinations (nCr) and permutations (nPr) for choosing r items from n. nPr = n! ÷ (n − r)! and nCr = n! ÷ (r! · (n − r)!), computed exactly with every step shown.
- Z-Score CalculatorFind the z-score (standard score) of a value from the mean (μ) and standard deviation (σ) using z = (x − μ) ÷ σ.
- Percentile CalculatorFind the kth percentile of a data set by linear interpolation (the R-7 method used by Excel and NumPy), with the sorted data, the rank and every step shown.
Physics
- Ohm's Law CalculatorSolve V = I × R for voltage, current or resistance, plus power in watts.
- Power CalculatorSolve P = W ÷ t for power, work or time — enter the two values you have.
- Force CalculatorNewton's second law F = m × a — solve for force, mass or acceleration.
- Pressure CalculatorSolve P = F ÷ A — enter the force in newtons and the area in square metres to get pressure in pascals, kilopascals and bar.
- Density CalculatorSolve ρ = m ÷ V for density, mass or volume in SI units.
- Kinetic Energy CalculatorKinetic energy KE = ½ m v² — solve for energy, mass or velocity.
Education
Time & Date
- Age CalculatorExact age in years, months and days — plus days until your next birthday.
- Date CalculatorAdd or subtract days, weeks, months or years from a date to find the resulting day.
- Time Duration CalculatorDays, weeks, months and years between any two dates.
- Business Days CalculatorWorking days (Mon–Fri) between two dates, with weekend and calendar days shown.
Construction
- Fence CalculatorPosts, rails, pickets or panels and concrete for any fence run — metric or imperial.
- Square Footage CalculatorArea = length × width × quantity, in feet (ft²) or meters (m²) — with the converted area shown in the other unit.
- Concrete CalculatorConcrete volume for a slab or footing: volume = length × width × (thickness ÷ 100) × quantity — enter length and width in metres and thickness in centimetres, and get cubic metres, litres and 25 kg bags.
- Tile CalculatorTiles = area ÷ tile area × (1 + waste) — enter the area in metres, the tile size in centimetres and a waste allowance for cuts.
- Paint CalculatorWork out how much paint to buy: litres = wall area × coats ÷ coverage. Enter the area in m², the number of coats and the paint's spread rate per litre.
Customs & Tax
Unit converters
Length
Length →- mMeters to FeetConvert meters (m) to feet (ft).
- ftFeet to MetersConvert feet (ft) to meters (m).
- cmCentimeters to InchesConvert centimeters (cm) to inches (in).
- inInches to CentimetersConvert inches (in) to centimeters (cm).
- kmKilometers to MilesConvert kilometers (km) to miles (mi).
- miMiles to KilometersConvert miles (mi) to kilometers (km).
- mMeters to YardsConvert meters (m) to yards (yd).
- mmMillimeters to InchesConvert millimeters (mm) to inches (in).
- ftFeet to CentimetersConvert feet (ft) to centimeters (cm).
- miMiles to Nautical milesConvert miles (mi) to nautical miles (nmi).
Weight & Mass
Weight & Mass →- kgKilograms to PoundsConvert kilograms (kg) to pounds (lb).
- lbPounds to KilogramsConvert pounds (lb) to kilograms (kg).
- gGrams to OuncesConvert grams (g) to ounces (oz).
- ozOunces to GramsConvert ounces (oz) to grams (g).
- kgKilograms to StoneConvert kilograms (kg) to stone (st).
- stStone to KilogramsConvert stone (st) to kilograms (kg).
- lbPounds to OuncesConvert pounds (lb) to ounces (oz).
- gGrams to KilogramsConvert grams (g) to kilograms (kg).
- tTonnes to PoundsConvert tonnes (t) to pounds (lb).
- mgMilligrams to GramsConvert milligrams (mg) to grams (g).
Area
Area →- m²Square meters to Square feetConvert square meters (m²) to square feet (ft²).
- ft²Square feet to Square metersConvert square feet (ft²) to square meters (m²).
- haHectares to AcresConvert hectares (ha) to acres (ac).
- acAcres to HectaresConvert acres (ac) to hectares (ha).
- km²Square kilometers to Square milesConvert square kilometers (km²) to square miles (mi²).
- mi²Square miles to Square kilometersConvert square miles (mi²) to square kilometers (km²).
- m²Square meters to Square yardsConvert square meters (m²) to square yards (yd²).
- acAcres to Square feetConvert acres (ac) to square feet (ft²).
- cm²Square centimeters to Square inchesConvert square centimeters (cm²) to square inches (in²).
- m²Square meters to HectaresConvert square meters (m²) to hectares (ha).
Temperature
Temperature →- °CDegrees Celsius to Degrees FahrenheitConvert degrees Celsius (°C) to degrees Fahrenheit (°F).
- °FDegrees Fahrenheit to Degrees CelsiusConvert degrees Fahrenheit (°F) to degrees Celsius (°C).
- °CDegrees Celsius to KelvinsConvert degrees Celsius (°C) to kelvins (K).
- KKelvins to Degrees CelsiusConvert kelvins (K) to degrees Celsius (°C).
- °FDegrees Fahrenheit to KelvinsConvert degrees Fahrenheit (°F) to kelvins (K).
- KKelvins to Degrees FahrenheitConvert kelvins (K) to degrees Fahrenheit (°F).
- °CDegrees Celsius to Degrees RankineConvert degrees Celsius (°C) to degrees Rankine (°R).
- °RDegrees Rankine to KelvinsConvert degrees Rankine (°R) to kelvins (K).
Speed
Speed →- km/hKilometers per hour to Miles per hourConvert kilometers per hour (km/h) to miles per hour (mph).
- mphMiles per hour to Kilometers per hourConvert miles per hour (mph) to kilometers per hour (km/h).
- m/sMeters per second to Kilometers per hourConvert meters per second (m/s) to kilometers per hour (km/h).
- km/hKilometers per hour to Meters per secondConvert kilometers per hour (km/h) to meters per second (m/s).
- knKnots to Kilometers per hourConvert knots (kn) to kilometers per hour (km/h).
- mphMiles per hour to Meters per secondConvert miles per hour (mph) to meters per second (m/s).
- knKnots to Miles per hourConvert knots (kn) to miles per hour (mph).
- m/sMeters per second to Feet per secondConvert meters per second (m/s) to feet per second (ft/s).
Time
Time →- hHours to MinutesConvert hours (h) to minutes (min).
- minMinutes to SecondsConvert minutes (min) to seconds (s).
- dDays to HoursConvert days (d) to hours (h).
- wkWeeks to DaysConvert weeks (wk) to days (d).
- yrYears to DaysConvert years (yr) to days (d).
- hHours to SecondsConvert hours (h) to seconds (s).
- moMonths to DaysConvert months (mo) to days (d).
- yrYears to MonthsConvert years (yr) to months (mo).
- minMinutes to HoursConvert minutes (min) to hours (h).
- sSeconds to MillisecondsConvert seconds (s) to milliseconds (ms).
Digital Storage
Digital Storage →- MBMegabytes to GigabytesConvert megabytes (MB) to gigabytes (GB).
- GBGigabytes to MegabytesConvert gigabytes (GB) to megabytes (MB).
- GBGigabytes to TerabytesConvert gigabytes (GB) to terabytes (TB).
- BBytes to BitsConvert bytes (B) to bits (bit).
- kBKilobytes to MegabytesConvert kilobytes (kB) to megabytes (MB).
- GiBGibibytes to GigabytesConvert gibibytes (GiB) to gigabytes (GB).
- MBMegabytes to MebibytesConvert megabytes (MB) to mebibytes (MiB).
- TBTerabytes to TebibytesConvert terabytes (TB) to tebibytes (TiB).
- bitBits to BytesConvert bits (bit) to bytes (B).
- GBGigabytes to GibibytesConvert gigabytes (GB) to gibibytes (GiB).
Volume
Volume →- LLiters to US gallonsConvert liters (L) to US gallons (gal).
- galUS gallons to LitersConvert US gallons (gal) to liters (L).
- mlMilliliters to US fluid ouncesConvert milliliters (ml) to US fluid ounces (fl oz).
- LLiters to Imperial gallonsConvert liters (L) to imperial gallons (gal (UK)).
- cupUS cups to MillilitersConvert US cups (cup) to milliliters (ml).
- tbspUS tablespoons to MillilitersConvert US tablespoons (tbsp) to milliliters (ml).
- galUS gallons to Imperial gallonsConvert US gallons (gal) to imperial gallons (gal (UK)).
- fl ozUS fluid ounces to MillilitersConvert US fluid ounces (fl oz) to milliliters (ml).
- ptUKImperial pints to LitersConvert imperial pints (pt (UK)) to liters (L).
- LLiters to US cupsConvert liters (L) to US cups (cup).
Fuel Economy
Fuel Economy →- mpgUSMiles per US gallon to Liters per 100 kmConvert miles per US gallon (mpg (US)) to liters per 100 km (L/100km).
- LLiters per 100 km to Miles per US gallonConvert liters per 100 km (L/100km) to miles per US gallon (mpg (US)).
- mpgUKMiles per imperial gallon to Liters per 100 kmConvert miles per imperial gallon (mpg (UK)) to liters per 100 km (L/100km).
- LLiters per 100 km to Miles per imperial gallonConvert liters per 100 km (L/100km) to miles per imperial gallon (mpg (UK)).
- km/LKilometers per liter to Liters per 100 kmConvert kilometers per liter (km/L) to liters per 100 km (L/100km).
- LLiters per 100 km to Kilometers per literConvert liters per 100 km (L/100km) to kilometers per liter (km/L).
- mpgUSMiles per US gallon to Kilometers per literConvert miles per US gallon (mpg (US)) to kilometers per liter (km/L).
- mpgUSMiles per US gallon to Miles per imperial gallonConvert miles per US gallon (mpg (US)) to miles per imperial gallon (mpg (UK)).
- km/LKilometers per liter to Miles per US gallonConvert kilometers per liter (km/L) to miles per US gallon (mpg (US)).
- mi/LMiles per liter to Liters per 100 kmConvert miles per liter (mi/L) to liters per 100 km (L/100km).