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Free online calculators that give you answers in seconds

Fitness, construction, dates, math, finance and astrology. Simple tools, clear results, built to work great on any device.

11free calculators
6categories
0sign-ups needed
๐Ÿ—๏ธ Concrete Calculator
Slab ยท 4 in thick
Length12 ft
Width10 ft
Thickness4 in
You need1.48 ydยณ
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8,000 stepsโ‰ˆ 3.8 miles
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1RM estimatePlates included
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Big ThreeSun ยท Moon ยท Rising
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Filter by category or use the search above to find the right tool fast.

๐Ÿ—๏ธConstruction

Concrete Calculator

Work out how much concrete you need for slabs, footings and columns.

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๐Ÿ“ฆConstruction

Cubic Yard Calculator

Convert length, width and depth into cubic yards for soil, gravel and mulch.

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๐Ÿ‹๏ธFitness

1 Rep Max Calculator

Estimate your one rep max from any set, with percentage chart and plate loading.

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๐Ÿ‘ŸFitness

Steps to Miles Calculator

Convert your daily step count into miles and kilometers.

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โฑ๏ธDate and time

Time Duration Calculator

Find the exact hours and minutes between two times.

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๐ŸŽ‚Date and time

Chronological Age Calculator

Get an exact age in years, months and days from a birth date.

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๐Ÿ”ขMath and study

Factor Calculator

List every factor and factor pair of any number.

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๐ŸŽ“Math and study

Weighted Grade Calculator

Calculate your overall grade from weighted exams and assignments.

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๐Ÿ“Math and study

Right Triangle Calculator

Find missing sides and angles with the Pythagorean theorem and trigonometry.

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๐Ÿ Finance

Mortgage Recast Calculator

See how a lump-sum principal payment could lower your monthly mortgage payment.

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๐ŸŒ™Astrology

Sun Moon Rising Sign Calculator

Find your Sun, Moon and Rising signs from your birth date, time and place.

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๐Ÿ—๏ธConstruction2 tools
๐Ÿ’ชFitness2 tools
๐Ÿ“…Date and time2 tools
๐ŸงฎMath and study3 tools
๐Ÿ’ฐFinance1 tool
โœจAstrology1 tool
How it works

From question to answer in 3 steps

No accounts, no downloads, no learning curve.

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Find your tool

Search by name or browse by category to land on the right calculator.

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Enter your numbers

Fill in a few simple fields. Every calculator explains what it needs.

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Get a clear result

See your answer instantly, with the formula explained so you can trust it.

Why CyberTivo

Built to be quick and clear

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Instant results

Type your numbers and get the answer right away.

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Works on any device

Clean layouts that are easy to use on phones, tablets and desktops.

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Free, no sign-up

Every calculator is free to use with no account needed.

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Guides included

Understand the formulas so you can trust the numbers.

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