Calculators
216Free online calculators
Choose a category to quickly find the calculator you need, from percentages and dates to physics, electricity and conversions.
Explore by category
Explore the9categories and go straight to the group that best matches the calculation you need.
Mathematics
Fractions, equations, ratios, numbers, sequences, and mathematical operations.
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Finance and percentages
Percentages, VAT, discounts, interest, loans, commissions and prices.
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Dates and time
Ages, date differences, business days, time worked, and calendars.
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Statistics and probability
Averages, probability, combinations, variance, standard deviation, and data analysis.
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Geometry
Areas, volumes, triangles, circles, coordinates, scales and polygons.
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Physics and mechanics
Movement, forces, energy, waves, fluids, springs and mechanics.
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Electricity and electronics
Ohm’s law, RLC circuits, batteries, motors, decibels, power, and circuits.
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Converters
Length, mass, volume, pressure, speed, temperature, energy and other units.
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Technology and productivity
Digital data, storage, downloads, productivity, attendance, and practical tools.
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Featured calculators
Quick access to everyday tools.
Percentage calculator
Calculate percentages of amounts and percentage ratios.
Rule of three calculator
Solve simple proportions with three known values.
Age Calculator
Calculate your exact age in years, months and days.
VAT Calculator
Add or remove VAT from any amount.
Compound interest
Calculate growth with compound interest.
Loan Calculator
Estimate a loan’s monthly payment, interest, and total repayment amount.
Average Calculator
Calculate the average, sum, minimum, and maximum.
Area and perimeter
Calculate the area and perimeter of common shapes.
Ohm’s law
Calculate voltage, current, or resistance.
Length converter
Convert between meters, kilometers, miles, feet, and inches.
Mass converter
Convert kg, g, lb, oz, tons and stone.
Advanced temperature converter
Convert °C, °F, and K with validation against absolute zero.
How to find a tool
You can browse the categories on this page or use the UtiliTools Pro site-wide search. The216calculators still have their own individual URL.
Calculators for study, work, and everyday tasks
The collection combines basic calculations and more specific tools. You can solve percentages, interests, dates, areas, units, physical quantities or electrical calculations without going through a list of hundreds of links.
Everyday calculations
Percentages, VAT, discounts, age, dates and conversion of units.
Study and science
Mathematics, statistics, geometry, physics, mechanics and electricity.
Finance and productivity
Interest, loans, commissions, digital storage and other practical tools.
Frequently asked questions about calculators
How many calculators are available?
UtiliTools Pro offers 216 calculators across 9 categories.
What kind of calculators can I find?
There are calculators of mathematics, finance, dates, statistics, geometry, physics, electricity, conversions and technology.
How do I find a specific calculator?
Browse a category or use the site-wide search to find tools by name or function.
Does each calculator have its own page?
Yes. The calculators have individual URLs so you can access the tool you need directly.
Are the calculators free?
Yes. Available calculators can be used online for free.