Calculator
Calculator Tools
Free calculator tools for everyday math, finance, dates, and planning.
Showing 24 of 268 tools.
Credit Card Payoff Calculator
Payoff time, total interest, and minimum-only vs fixed-payment comparison for one card.
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CalculatorFIRE Number Calculator
FIRE number, time to FI, and Coast FIRE in one calculator.
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CalculatorScientific Calculator
Trig, log, exp, sqrt, factorial, memory, and history in your browser.
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CalculatorMortgage Calculator
Full PITI mortgage payment with PMI, HOA, extra principal, and amortization schedule.
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CalculatorROI Calculator
Calculate ROI, net profit, return multiple, and annualized return (CAGR).
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CalculatorBMI Calculator
BMI in kg/cm or lb/ft+in with category, healthy weight range, and BMI prime.
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CalculatorLoan Calculator
Monthly payment, total interest, payoff time, and amortization schedule.
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Calculator3D Printing Cost and Filament Calculator
Enter the grams, metres, or volume your slicer reports and get filament weight and length plus a full material, electricity, and labor cost breakdown.
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CalculatorABV Calculator
Find the alcohol by volume of beer, wine, cider, mead, or kombucha from original and final gravity readings.
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CalculatorBook Spine Width Calculator
Get the spine width and full cover spread from page count and paper stock, for paperback or hardcover.
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CalculatorCrop Factor Calculator
Get the 35mm-equivalent focal length, equivalent aperture, and angle of view for any sensor, or compare framing between two sensor sizes.
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CalculatorDecibel Adder
Combine several dB sound levels into one reading, or subtract a background level to recover a single source, using correct logarithmic math.
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CalculatorE-Series Value Calculator
Round any value to the nearest E-series standard resistor, capacitor, or inductor value, with the error and the best two-component series and parallel pairs.
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CalculatorField of View Calculator
Work out the scene a lens captures at a distance, or the distance and focal length to frame a subject.
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CalculatorModular Arithmetic Calculator
Work out a mod m, modular arithmetic, a^b mod m, and the modular inverse, all exact for very large numbers.
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CalculatorReactance Calculator
Find inductive reactance (XL), capacitive reactance (XC), or the resonant frequency where they are equal, solving for whichever value you leave blank.
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CalculatorStreaming Data Usage Calculator
Estimate the data your streaming uses per hour, day, and month, and test it against your data cap.
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CalculatorTap Drill Size Calculator
Look up or calculate the correct drill bit for any inch or metric tap, with an adjustable thread engagement percent.
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CalculatorVSWR Return Loss Calculator
Enter any one of VSWR, return loss, reflection coefficient, or mismatch loss and get the other three plus the reflected and transmitted power.
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Calculator555 Timer Calculator
Find a 555 timer's frequency, duty cycle, or pulse width, or solve for the resistor or capacitor to use.
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CalculatorBox Fill Calculator
Work out how many items fit in a box using real row, column, and layer packing.
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CalculatorComplex Number Calculator
Do arithmetic on complex numbers and find modulus, argument, conjugate, powers, and roots, all in your browser.
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CalculatorDipole Antenna Calculator
Find half-wave dipole, vertical, and loop antenna lengths from a frequency, with metric and feet output.
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CalculatorExposure Value (EV) Calculator
Compute EV from aperture, shutter, and ISO, or get equivalent exposures from an EV.
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