Abacocalc
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Free · No sign-up · Private

Your calculations,
clean and precise.

Professional calculators for finance, health and everyday needs. Every formula documented, every result instant — all running on your device.

Popular:PercentageCompound InterestDiscountFuel Cost Calculator

Maths

Percentages, equations, statistics

4
PercentageFractionAverage (Mean)Standard Deviation

Finance

Loans, taxes, salaries, investments

6
Compound InterestDiscountSimple InterestReturn on Investment (ROI)Credit Card PayoffLoan Payment

Everyday

Handy tools for the day

9
TipFuel Cost CalculatorUnit Price ComparisonTrip Cost SplitFuel Cost (MPG)Fuel Economy CalculatorElectric vs PetrolMonthly Fuel CostFuel Savings Calculator

Date & Time

Age, durations, time zones

5
AgeDays Between DatesCountdown TimerWork Hours (Time Card)Date Calculator (Add / Subtract)

Conversions

Units, currencies, sizes

8
Length ConverterWeight ConverterTemperature ConverterArea ConverterVolume ConverterSpeed ConverterTime ConverterData Storage Converter

Construction

Materials, areas, volumes

3
TilePaintConcrete

Education

Grades, averages, targets

3
GPAFinal Grade NeededSchool Grades (Greece)

Health & Wellness

Body, nutrition, fitness

13
Body Mass IndexBasal Metabolic Rate (BMR)BMI PrimeWaist-to-Height RatioWaist-to-Hip RatioDaily Water IntakeTotal Daily Energy Expenditure (TDEE)Ideal WeightBody Fat PercentageCalories BurnedHeart Rate ZonesLean Body MassPregnancy Due Date

Clean and precise calculations for every day

Abacocalc keeps your everyday calculations clean and precise. It is a growing collection of free online calculators for finance, health, construction, education, maths, dates and unit conversions — all in one place, with a simple and consistent design.

Whether you need to work out a loan payment, check your BMI, split a bill, convert kilometres to miles or estimate how much paint a room needs, you will find a fast, focused tool for the job. There is no sign-up and no clutter — just the calculation you came for and a clear, precise result.

Every calculator is free and runs entirely in your browser. Your numbers are never uploaded to a server, so your data stays private on your own device, and results update instantly as you type. Because the maths runs locally, each calculation is fast and repeatable.

Each tool comes with a short explanation of the formula behind it and answers to common questions, so you understand not just the result but how it was calculated. The goal is calculations you can trust and actually learn from, not a black box that only shows a number.

The site works in English and Greek and is built to be fast on any device. Browse by category above, search for a specific calculator, or start with one of the popular tools. New calculators are added regularly based on what people actually need — if something is missing, use the contact link in the footer to let us know.