FreeTools Labs
Freeonline tools
Science-based tools and planners for everyday use. 100% free.
Calculators, planners and online tools — free, unlimited and later syncable with your account.
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Categories
Choose a category to filter modules precisely.
Popular tools
The most important tools for a quick start.
Electrical Engineering Calculator
Calculate Ohm's law, resistors, color codes and voltage drop.
Battery Runtime & Capacity Calculator
Calculate energy, runtime, charge time and S/P values.
Tip & Bill Split Calculator
Calculate tips and split bills into payable shares.
Electricity & energy cost calculator
Calculate appliance energy use, standby and electricity costs.
Margin, markup & profit calculator
Calculate profit, margin, markup and required prices.
Fuel & trip cost calculator
Calculate consumption, range, trip and commute costs.
Training plan generator
Build a home bodyweight plan for your goal and current ability.
1RM calculator
Estimate your 1RM from weight and reps with multiple methods.
Age calculator
Calculate your exact calendar age.
Fraction calculator
Calculate and simplify fractions and mixed numbers exactly.
Grade calculator
Calculate a general percentage performance.
Date & Time Calculator
Calculate dates, ISO weeks, workdays, clock times, durations and working time.
Investment & Finance Calculator
Calculate interest, savings, returns, present value, NPV, IRR and fees.
Inflation calculator
Calculate future money need and purchasing power loss.
Sales tax calculator
Calculate net, gross and included tax.
Income tax calculator
Model income tax by country and tax period.
Conversion calculator
Convert physical, technical and digital units.
IP subnet calculator
Analyze and split IPv4 and IPv6 networks.
Concrete calculator
Calculate concrete volume, bags and order quantity.
Statistics Calculator
Analyze measures, correlation and regression.
Scientific Calculator
Evaluate free expressions with scientific functions.
Pregnancy Calculator
Estimate due date, pregnancy week, conception and IVF dating.
Body Metrics Calculator
Estimate body fat, FFM, FFMI, WHtR, resting energy and reference weight.
Running Pace Calculator
Calculate pace, finish time, distance and splits.
Salary & Hourly Wage Calculator
Convert gross salary, hourly pay and overtime.
Retirement calculator
Plan private retirement capital and income.
Loan & Financing Calculator
Calculate loans, debt payoff, mortgage and vehicle financing.
Buy, Rent & Lease Calculator
Compare property renting, buying, rental returns and vehicle leasing.
Number & Numeral System Calculator
Prime numbers, factors, GCD, LCM, numeral systems and Roman numerals.
Chemistry Calculator
Formulas, molar mass, moles, concentration, dilution and density.
Cycle & Ovulation Calculator
Period, cycle length, ovulation estimate and history.
Coordinate Geometry Calculator
Distances, lines, circles, triangles and polygon areas from coordinates.
Random number generator
Generate random numbers within a selected range.
Password generator
Generate strong random passwords entirely locally.
Calorie calculator
Estimate your daily energy needs.
Percentage calculator
Calculate percentage values, changes and differences.
Kitchen measures and unit converter
Convert selected ingredients into practical kitchen measures.
Protein calculator
Estimate your approximate protein needs.
BMI Calculator
Calculate classic BMI as a screening measure.
Water intake reference values
View DGE water-intake reference values by age group.
Why FreeTools Labs?
Science-based
Calculations use recognised methods.
100% free
All tools are available free of charge.
Privacy
We store nothing without your consent.
Always growing
New tools and features are added regularly.
Free tools for everyday use
Discover practical calculators and planners for everyday questions.