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Free Online Calculators

Fast, simple calculators for fitness, construction, dates and time, math, finance and astrology. Pick a tool and get your answer in seconds.

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Construction Fitness Date and time Math and study Finance Astrology
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Construction calculators

Estimate materials and volumes before you order.

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Concrete Calculator

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

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Cubic Yard Calculator

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

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Fitness calculators

Track strength and daily activity.

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1 Rep Max Calculator

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

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Steps to Miles Calculator

Convert your daily step count into miles and kilometers.

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Date and time calculators

Measure the gap between two moments.

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Time Duration Calculator

Find the exact hours and minutes between two times.

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Chronological Age Calculator

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

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Math and study calculators

Quick answers for homework and grades.

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Factor Calculator

List every factor and factor pair of any number.

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Weighted Grade Calculator

Calculate your overall grade from weighted exams and assignments.

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Right Triangle Calculator

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

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Finance calculators

Estimate payments and savings before you decide.

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Mortgage Recast Calculator

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

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Astrology calculators

Explore your birth chart basics.

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Sun Moon Rising Sign Calculator

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

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Works together

Related calculators

Tools that pair well, grouped by what you are working on.

Building and materials

Concrete is ordered by the cubic yard, so these tools work together.

Concrete CalculatorEstimate how much concrete a slab, footing or column needs. Cubic Yard CalculatorConvert your slab or footing volume into cubic yards. Right Triangle CalculatorCheck diagonals and slopes when laying out a form.

Activity and fitness

More tools for tracking your activity.

1 Rep Max CalculatorEstimate your max strength from any set. Steps to Miles CalculatorTurn your daily steps into distance. Time Duration CalculatorFind how long a walk or workout took.

Dates and times

Working with dates and times? Try these too.

Time Duration CalculatorExact hours and minutes between two times. Chronological Age CalculatorExact age in years, months and days from a birth date. Sun Moon Rising Sign CalculatorTurn your birth date into your Sun, Moon and Rising signs.

School and study

More free tools for school and study.

Weighted Grade CalculatorWork out your overall grade from weighted scores. Factor CalculatorList every factor of any number. Right Triangle CalculatorSolve missing sides and angles step by step. Time Duration CalculatorPlan study time with exact durations.

Home and money

Planning around your home? More free tools.

Mortgage Recast CalculatorEstimate a lower monthly payment after a lump sum. Concrete CalculatorEstimate concrete for your next home project. Right Triangle CalculatorMeasure rafters, ramps and diagonals.
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