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.
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.
- 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.
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.
Math
- Percentage CalculatorX% of Y, percent change and percent difference — with worked steps.
- 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.
- Speed, Distance & Time CalculatorSolve for speed, distance or time given the other two.
Statistics
Physics
- Ohm's Law CalculatorSolve V = I × R for voltage, current or resistance, plus power in watts.
- Force CalculatorNewton's second law F = m × a — solve for force, mass or acceleration.
- 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
Construction
Customs & Tax
Unit converters
Length
All length →- Meters to FeetConvert meters (m) to feet (ft).
- Feet to MetersConvert feet (ft) to meters (m).
- Centimeters to InchesConvert centimeters (cm) to inches (in).
- Inches to CentimetersConvert inches (in) to centimeters (cm).
- Kilometers to MilesConvert kilometers (km) to miles (mi).
- Miles to KilometersConvert miles (mi) to kilometers (km).
- Meters to YardsConvert meters (m) to yards (yd).
- Millimeters to InchesConvert millimeters (mm) to inches (in).
- Feet to CentimetersConvert feet (ft) to centimeters (cm).
- Miles to Nautical milesConvert miles (mi) to nautical miles (nmi).
Weight & Mass
All weight & mass →- Kilograms to PoundsConvert kilograms (kg) to pounds (lb).
- Pounds to KilogramsConvert pounds (lb) to kilograms (kg).
- Grams to OuncesConvert grams (g) to ounces (oz).
- Ounces to GramsConvert ounces (oz) to grams (g).
- Kilograms to StoneConvert kilograms (kg) to stone (st).
- Stone to KilogramsConvert stone (st) to kilograms (kg).
- Pounds to OuncesConvert pounds (lb) to ounces (oz).
- Grams to KilogramsConvert grams (g) to kilograms (kg).
- Tonnes to PoundsConvert tonnes (t) to pounds (lb).
- Milligrams to GramsConvert milligrams (mg) to grams (g).
Area
All area →- Square meters to Square feetConvert square meters (m²) to square feet (ft²).
- Square feet to Square metersConvert square feet (ft²) to square meters (m²).
- Hectares to AcresConvert hectares (ha) to acres (ac).
- Acres to HectaresConvert acres (ac) to hectares (ha).
- Square kilometers to Square milesConvert square kilometers (km²) to square miles (mi²).
- Square miles to Square kilometersConvert square miles (mi²) to square kilometers (km²).
- Square meters to Square yardsConvert square meters (m²) to square yards (yd²).
- Acres to Square feetConvert acres (ac) to square feet (ft²).
- Square centimeters to Square inchesConvert square centimeters (cm²) to square inches (in²).
- Square meters to HectaresConvert square meters (m²) to hectares (ha).
Temperature
All temperature →- Degrees Celsius to Degrees FahrenheitConvert degrees Celsius (°C) to degrees Fahrenheit (°F).
- Degrees Fahrenheit to Degrees CelsiusConvert degrees Fahrenheit (°F) to degrees Celsius (°C).
- Degrees Celsius to KelvinsConvert degrees Celsius (°C) to kelvins (K).
- Kelvins to Degrees CelsiusConvert kelvins (K) to degrees Celsius (°C).
- Degrees Fahrenheit to KelvinsConvert degrees Fahrenheit (°F) to kelvins (K).
- Kelvins to Degrees FahrenheitConvert kelvins (K) to degrees Fahrenheit (°F).
- Degrees Celsius to Degrees RankineConvert degrees Celsius (°C) to degrees Rankine (°R).
- Degrees Rankine to KelvinsConvert degrees Rankine (°R) to kelvins (K).
Speed
All speed →- Kilometers per hour to Miles per hourConvert kilometers per hour (km/h) to miles per hour (mph).
- Miles per hour to Kilometers per hourConvert miles per hour (mph) to kilometers per hour (km/h).
- Meters per second to Kilometers per hourConvert meters per second (m/s) to kilometers per hour (km/h).
- Kilometers per hour to Meters per secondConvert kilometers per hour (km/h) to meters per second (m/s).
- Knots to Kilometers per hourConvert knots (kn) to kilometers per hour (km/h).
- Miles per hour to Meters per secondConvert miles per hour (mph) to meters per second (m/s).
- Knots to Miles per hourConvert knots (kn) to miles per hour (mph).
- Meters per second to Feet per secondConvert meters per second (m/s) to feet per second (ft/s).
Time
All time →- Hours to MinutesConvert hours (h) to minutes (min).
- Minutes to SecondsConvert minutes (min) to seconds (s).
- Days to HoursConvert days (d) to hours (h).
- Weeks to DaysConvert weeks (wk) to days (d).
- Years to DaysConvert years (yr) to days (d).
- Hours to SecondsConvert hours (h) to seconds (s).
- Months to DaysConvert months (mo) to days (d).
- Years to MonthsConvert years (yr) to months (mo).
- Minutes to HoursConvert minutes (min) to hours (h).
- Seconds to MillisecondsConvert seconds (s) to milliseconds (ms).
Digital Storage
All digital storage →- Megabytes to GigabytesConvert megabytes (MB) to gigabytes (GB).
- Gigabytes to MegabytesConvert gigabytes (GB) to megabytes (MB).
- Gigabytes to TerabytesConvert gigabytes (GB) to terabytes (TB).
- Bytes to BitsConvert bytes (B) to bits (bit).
- Kilobytes to MegabytesConvert kilobytes (kB) to megabytes (MB).
- Gibibytes to GigabytesConvert gibibytes (GiB) to gigabytes (GB).
- Megabytes to MebibytesConvert megabytes (MB) to mebibytes (MiB).
- Terabytes to TebibytesConvert terabytes (TB) to tebibytes (TiB).
- Bits to BytesConvert bits (bit) to bytes (B).
- Gigabytes to GibibytesConvert gigabytes (GB) to gibibytes (GiB).
Volume
All volume →- Liters to US gallonsConvert liters (L) to US gallons (gal).
- US gallons to LitersConvert US gallons (gal) to liters (L).
- Milliliters to US fluid ouncesConvert milliliters (ml) to US fluid ounces (fl oz).
- Liters to Imperial gallonsConvert liters (L) to imperial gallons (gal (UK)).
- US cups to MillilitersConvert US cups (cup) to milliliters (ml).
- US tablespoons to MillilitersConvert US tablespoons (tbsp) to milliliters (ml).
- US gallons to Imperial gallonsConvert US gallons (gal) to imperial gallons (gal (UK)).
- US fluid ounces to MillilitersConvert US fluid ounces (fl oz) to milliliters (ml).
- Imperial pints to LitersConvert imperial pints (pt (UK)) to liters (L).
- Liters to US cupsConvert liters (L) to US cups (cup).
Fuel Economy
All fuel economy →- Miles per US gallon to Liters per 100 kmConvert miles per US gallon (mpg (US)) to liters per 100 km (L/100km).
- Liters per 100 km to Miles per US gallonConvert liters per 100 km (L/100km) to miles per US gallon (mpg (US)).
- Miles per imperial gallon to Liters per 100 kmConvert miles per imperial gallon (mpg (UK)) to liters per 100 km (L/100km).
- Liters per 100 km to Miles per imperial gallonConvert liters per 100 km (L/100km) to miles per imperial gallon (mpg (UK)).
- Kilometers per liter to Liters per 100 kmConvert kilometers per liter (km/L) to liters per 100 km (L/100km).
- Liters per 100 km to Kilometers per literConvert liters per 100 km (L/100km) to kilometers per liter (km/L).
- Miles per US gallon to Kilometers per literConvert miles per US gallon (mpg (US)) to kilometers per liter (km/L).
- Miles per US gallon to Miles per imperial gallonConvert miles per US gallon (mpg (US)) to miles per imperial gallon (mpg (UK)).
- Kilometers per liter to Miles per US gallonConvert kilometers per liter (km/L) to miles per US gallon (mpg (US)).
- Miles per liter to Liters per 100 kmConvert miles per liter (mi/L) to liters per 100 km (L/100km).