All tools
Every calculator and converter currently available on MultiConvers.
Category
50 tools
Percentage Calculator
Calculate percentages three ways: find a percentage of a number, find what percent one number is of another, or find the total when you know a part and a percentage.
Percentage Change
Find how much a value increased or decreased as a percentage of the original amount.
Discount Calculator
Work out the amount saved and the sale price from an original price and a percent off.
Markup Calculator
Add a markup percent to cost to get the markup amount and selling price.
Margin Calculator
From cost and selling price, see profit, margin percent and markup percent.
Average Calculator
Find the arithmetic mean, count and sum of a list of numbers pasted or typed in your browser.
Ratio Calculator
Simplify two numbers to lowest terms and see the decimal relationship A ÷ B.
Fraction to Decimal
Convert a numerator and denominator into a decimal and a percentage.
Days From Today
Find the exact calendar date a set number of days before or after a chosen start date.
Days Ago
Find the calendar date a given number of days before today, or before any start date you choose.
Days Between Dates
Count how many calendar days separate two dates, including the week-and-remainder breakdown.
Weeks Between Dates
See how many full weeks (and leftover days) separate two calendar dates.
Months Between Dates
Count whole calendar months between two dates, plus leftover days and a years-and-months split.
Age Calculator
Calculate age in years, months and days from a birth date to today or to any target date.
Business Days
Count weekdays between two dates, excluding Saturday and Sunday. Public holidays are not removed.
Day of Week
Look up which weekday a calendar date falls on, without time-zone shifts.
Birthday Countdown
See the next birthday date, weekday and how many days remain from today.
Time Duration
Find hours and minutes between two clock times, including overnight spans that cross midnight.
CM to Inches
Convert centimeters to inches instantly using the exact 2.54 cm/inch definition.
Inches to CM
Convert inches to centimeters using the exact international definition of the inch.
Feet to Meters
Convert feet to metres using the exact international foot of 0.3048 m.
Meters to Feet
Convert metres to feet by dividing by the exact 0.3048 m international foot.
MM to Inches
Convert millimetres to inches using 1 inch = 25.4 mm exactly.
Inches to MM
Convert inches to millimetres by multiplying by the exact 25.4 mm inch.
KG to LBS
Convert kilograms to pounds using the exact international avoirdupois pound of 0.45359237 kg.
LBS to KG
Convert pounds to kilograms with the exact 0.45359237 kg per avoirdupois pound definition.
Grams to Ounces
Convert grams to avoirdupois ounces using 1 oz = 28.349523125 g exactly.
Ounces to Grams
Convert avoirdupois ounces to grams using 1 oz = 28.349523125 g exactly.
KM to Miles
Convert kilometres to international miles using the exact 1 609.344 metre mile.
Miles to KM
Convert international miles to kilometres. One mile is exactly 1.609344 km.
Liters to US Gallons
Convert litres to US liquid gallons (3.785411784 L). Not the Imperial gallon.
US Gallons to Liters
Convert US liquid gallons to litres using 1 US gal = 3.785411784 L exactly.
ML to US Fluid Ounces
Convert millilitres to US fluid ounces (29.5735295625 mL). Not Imperial fl oz.
HP to kW
Convert mechanical horsepower to kilowatts (1 hp = 0.7456998716 kW).
kW to HP
Convert kilowatts to mechanical horsepower using 1 hp = 0.7456998716 kW.
C to F
Convert Celsius to Fahrenheit with the exact formula F = C × 9/5 + 32.
F to C
Convert Fahrenheit to Celsius with C = (F − 32) × 5/9. 32°F is 0°C; 212°F is 100°C.
Electricity Cost
Estimate energy (kWh) and cost from power in watts or kW, hours of use and price per kWh.
Appliance Energy Cost
Estimate daily and monthly kWh and cost for an appliance from watts, hours per day, days per month and price.
EV Charging Cost
Estimate battery energy added, grid energy and charging cost from capacity, start/target %, price and efficiency.
EV Charging Time
Estimate ideal charging time from battery size, start/target % and charger power. Real sessions are often slower.
kWh Cost
Multiply kilowatt-hours by your electricity price to get a total cost.
Fuel Cost
Estimate litres used, trip fuel cost and cost per kilometre from distance, L/100 km and price per litre.
L/100km to MPG
Convert litres per 100 km to miles per gallon, with a clear US vs Imperial gallon choice.
MPG to L/100km
Convert miles per gallon to litres per 100 km, choosing US or Imperial gallons explicitly.
Cost Per Kilometer
Divide a total cost by distance to see cost per kilometre.
Road Trip Cost
Estimate fuel, optional tolls and parking, and a total trip cost from distance, L/100 km and fuel price.
Word Counter
Count words, characters, sentences and paragraphs in your browser. Text never leaves this page.
Character Counter
Count characters, characters without spaces and words locally in your browser. Text never leaves this page.
Unix Timestamp
Convert Unix seconds to UTC and local date/time, or a date/time back to Unix seconds. Millisecond values are detected.