Electronics & energy
Battery runtime from capacity and load
Battery runtime from capacity and load: Usable energy Wh = capacity Ah × nominal V × usable fraction × efficiency.
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Math & statistics
Bayesian binary-classifier posterior
Bayesian binary-classifier posterior: Apply Bayes’ theorem: posterior after a positive result = prior × true-positive rate / [prior × true-positive rate + (1−prior) × false-positive rate].
Math & statistics
Binomial probability
Binomial probability with an explained formula, a worked example and checks for invalid or unsupported inputs.
Web & design
Blend two HEX colors
Blend two HEX colors with editable inputs, an explained method, a worked example and clearly stated output limits.
Money & borrowing
Bond yield to maturity solver
Bond yield to maturity solver: Solve the discounted coupon-plus-face-value equation by bisection over a nominal annual yield from −90% to 1,000%.
Pay & allowances
Bonus after entered deductions
Plan the net amount from a bonus using a combined deduction percentage and fixed deductions you enter.
Everyday arithmetic
Box packing in six orientations
Box packing in six orientations: For each of six axis-aligned item orientations, multiply the whole-item counts along the three container dimensions; report the best uniform orientation.
Business & selling
Break-even units
Break-even units: Whole units = ceil(fixed costs ÷ (price − variable cost))
Home & construction
Brick wall quantity with mortar joints
Brick wall quantity with mortar joints using clearly labeled inputs, with the formula, a worked example and practical limits explained.
Business & selling
Business cash runway
Estimate how many months your business cash lasts at a constant monthly net burn rate.
Dates & time
Business days with an entered holiday list
Business days with an entered holiday list: Count Monday–Friday in [start,end), excluding unique dates from the entered holiday set.
Text & writing
Caesar cipher and ROT13
Caesar cipher and ROT13 locally in your browser, with clear input requirements, a worked example and an explanation of the result.
Dates & time
Calendar date to ISO ordinal date
Calendar date to ISO ordinal date with editable inputs, an explained method, a worked example and clearly stated output limits.
Taxes & fees
Canada federal income tax — before credits
Calculate 2026 Canadian federal bracket tax before credits. Enter taxable income after deductions; provincial tax, CPP and EI are excluded.
Taxes & fees
Canada GST, HST and provincial sales tax
Add standard GST/HST and provincial sales tax for Canadian provinces and territories, including Nova Scotia’s 14% HST.
Electronics & energy
Capacitor stored energy and charge
Capacitor stored energy and charge: Charge Q=CV; stored energy E=½CV².
Money & borrowing
Car lease payment from money factor
Estimate a lease’s monthly depreciation, finance charge and payment using the quoted money factor.
Business & selling
Cash conversion cycle
Cash conversion cycle: enter your own figures, see the result and calculation method, and check the model’s assumptions.
Developer & data
chmod numeric permission calculator
Decode a Unix permission mode into owner, group and other read, write and execute permissions.
Geometry
Circle area and circumference
Circle area and circumference: A = πr²; circumference = 2πr
Web & design
Color contrast ratio
Color contrast ratio: WCAG relative luminance: linearize sRGB, L=0.2126R+0.7152G+0.0722B; ratio=(lighter+.05)/(darker+.05)
Web & design
Color palette from a HEX color
Generate complementary, analogous, triadic or split-complementary HEX colors by rotating the hue of a base color.
Math & statistics
Combinations
Combinations: n! ÷ [r!(n−r)!]; order does not matter
Business & selling
Commission
Commission: Commission = sales × rate/100
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