Free Online Calculators
Free online calculators
Search, resume recent tools, or browse the most-used calculators across finance, health, maths, dates, and everyday topics.
Find free online calculators for mortgages, loans, BMI, calories, age, percentages, date differences, and hundreds of other everyday questions. Start with a broad topic, narrow into the right subcategory, and open a calculator that gives immediate results with clear follow-on guidance when you need more context.
Most popular
Start with the calculators people use most.
Energy Availability Calculator
Use this energy availability calculator to calculate EA, screen for low energy availability (LEA) and RED-S risk, compare intake and exercise-load scenarios.
Body Shape Calculator
Use this body shape calculator to identify your body type from shoulders, bust or chest, waist, and hip measurements, then interpret waist-to-hip.
MET Calculator
Use this MET calculator to convert metabolic equivalent values into calories burned, gross vs net exercise calories, VO2-equivalent oxygen demand.
Easter Date Calculator
Use this Easter date calculator to find when Easter Sunday falls, compare Western and Orthodox Easter, review Holy Week dates, and scan nearby years.
Sweepstake Generator
Use this sweepstake generator to randomly assign teams, prizes, horses, or numbers to names, including shared-entry draws for oversized office pools.
Average Speed Calculator
Use this average speed calculator to work out trip average speed from distance and time, compare moving speed with stop-inclusive averages.
Recently added or updated
Fresh tools and improvements.
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EV Battery Energy Helper
Estimate usable EV battery energy, EV range, charge-window energy, wall energy billed, charging time, and charging cost from battery size, efficiency.
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EV Charging Cost Calculator
Calculate EV charging cost from monthly mileage, vehicle efficiency, home and public electricity tariffs, charger efficiency, battery charge percentage.
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Enterprise Value Calculator
Calculate enterprise value from market capitalization, debt, preferred equity, minority interest, and cash, then review the bridge from equity value to EV.
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Epoxy Resin Calculator
Estimate mixed epoxy volume, resin-hardener split, coat count, and optional kit count and material cost from project area, thickness, waste, and mix ratio.
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Equation of a Line Calculator
Find the equation of a line through two points in slope-intercept, point-slope, and standard forms.
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Equivalent Rate Calculator
Convert a nominal annual rate between compounding schedules while preserving the same effective annual yield.
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