PDFAITools
318+ Free Online Tools
Browse 318+ free tools across PDF, SEO, calculators, image editing, text and more — no account needed.
318
Free Tools
Debt Consolidation Calculator
Compare consolidating multiple debts into one loan — see monthly savings and total interest.
Finance & Calculators
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Due Date Calculator
Calculate your pregnancy due date and all three trimester date ranges using Naegele's rule.
Finance & Calculators
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Calories Burned Calculator
Calculate calories burned for 40+ activities using MET values based on your weight and duration.
Finance & Calculators
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Carbohydrate Calculator
Calculate your daily carbohydrate intake target based on USDA/DRI guidelines and your goal.
Finance & Calculators
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Protein Calculator
Calculate your daily protein target using RDA, ISSN and lean body mass methods.
Finance & Calculators
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Lean Body Mass Calculator
Calculate your lean body mass using Boer, James and Hume formulas.
Finance & Calculators
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Period Calculator
Predict your next 6 periods, ovulation days and fertile windows based on your cycle.
Finance & Calculators
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Ovulation Calculator
Calculate your ovulation day and fertile window to find the best days to conceive.
Finance & Calculators
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BAC Calculator
Estimate blood alcohol content using the Widmark formula. For educational purposes only.
Finance & Calculators
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Army Body Fat Calculator
Calculate body fat % using the US Army circumference method and check Army standards.
Finance & Calculators
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Healthy Weight Calculator
Find your healthy weight range using BMI, Devine, Robinson, Miller and Hamwi formulas.
Finance & Calculators
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Body Surface Area Calculator
Calculate body surface area using Mosteller, DuBois, Haycock and Boyd formulas.
Finance & Calculators
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Weight Watchers Points Calculator
Calculate WW PersonalPoints for any food using the current points formula.
Finance & Calculators
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Triangle Calculator
Solve any triangle from SSS, SAS, ASA, AAS or right triangle inputs. Shows all angles, sides and area.
Finance & Calculators
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Circle Calculator
Calculate radius, diameter, circumference and area — enter any one value to get all others.
Finance & Calculators
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Surface Area Calculator
Calculate surface area and volume for sphere, cube, cylinder, cone, pyramid and more.
Finance & Calculators
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Pythagorean Theorem Calculator
Solve for any side of a right triangle using the Pythagorean theorem a² + b² = c².
Finance & Calculators
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Right Triangle Calculator
Solve a right triangle from any two known values — sides or angles.
Finance & Calculators
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Probability Calculator
Calculate probability for single events, combined events, complements and conditional probability.
Finance & Calculators
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Z-Score Calculator
Calculate z-score from raw score and find the corresponding percentile and probability.
Finance & Calculators
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Confidence Interval Calculator
Calculate confidence intervals for means and proportions at 90%, 95% or 99% confidence levels.
Finance & Calculators
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Matrix Calculator
Add, subtract, multiply matrices and find determinant, inverse and transpose for 2×2 to 4×4 matrices.
Finance & Calculators
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Slope Calculator
Calculate slope, y-intercept, line equation, distance and midpoint between two points.
Finance & Calculators
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Logarithm Calculator
Calculate log base 10, natural log, log base 2 or any custom base. Includes antilog mode.
Finance & Calculators
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