Every calculator here shows its formula.

Finance calculators, privacy tools, statistics utilities, and health checks. Everyday tools that don't need a login or a subscription.

Everyday Tools

9 tools

Privacy

See what your photos are hiding, then strip it.

Try it 20-image batches

Compress unlimited images without a single upload.

Try it re-encodes whole queue

Finance

COGS, gross profit, and margin in one calculation.

Every down payment scenario, side by side.

Try it 3-20% or custom

The compound interest calculator that doesn't get in your way.

Try it linked sliders

P=

The clean APR↔APY converter. Your answer in 10 seconds.

Try it 8 compounding frequencies

Statistics

Test statistic in, p-value out. 30 seconds.

Try it 4 distributions, any tail

Health

Am I intoxicated? How long until I'm sober?

Try it custom ABV per drink

Science

Density, mass, volume: solved and explained.

Try it 24 units

Route by the job

Compare down paymentsPerclo Run a margin checkCogsly Check significancePvalr Strip GPS and device IDs before posting photosBlank20-image batches, ZIP out Batch-compress imagesKomprsOffscreenCanvas + a Web Worker Settle APR against APYParify Project growth over yearsAccruo Solve density, mass, or volumeMassvo Estimate BAC with a time-to-zero countdownSober

Where the formulas come from

SoberWidmark formulaThe formula used in forensic toxicology, with custom ABV per drink.AccruoCompound interest with periodic contributionsValidated within a dollar of SEC Investor.gov reference output.PvalrZ, T, chi-square, and F distributionsComputed client-side through jStat.PercloMonthly payment with PMI priced by LTV band3%, 5%, 10%, and 20% down compared side by side.ParifyAPR to APY conversion, both directionsEight compounding frequencies. The exact formula prints under the result.MassvoDensity, mass, and volume, solved for any variable24 units. An 18-material reference table prefills density.CogslyBeginning inventory + purchases + direct expenses - ending inventoryThe breakdown panel shows every line as it computes.

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