Thinkery Tools

Focus timer with work/break cycles

Countdown timer and stopwatch combo

See time melt away. A visual countdown disk for focus sessions.

Create visual daily routines for children with timers and rewards

Live countdown to any date

Color-coded countdown timer with warning and danger thresholds for presentations

Exam timer with per-question time tracking, progress bar, and pace alerts

High-precision stopwatch with lap recording, best/worst comparison, and live stats

Drag-drop interval sequencer for Tabata, HIIT, EMOM, Pyramid, AMRAP — 8 presets, repeat blocks, audio cues

eisenhower-matrix

Calculate tips and split bills

Visualize how your investments grow over time

Calculate monthly payments and amortization

Convert currencies with real-time exchange rates

Plan how much to save each month to hit your target

Final price after discount

Calculate margin and markup

Quebec tax, simplified

CPI-adjusted purchasing power, Canada & US

Compare Snowball and Avalanche strategies with month-by-month simulation

Find optimal bedtime based on sleep cycles

Estimate your due date

Calculate Body Mass Index with WHO categories — metric and imperial

Calculate running pace, finish time, or distance with splits table

bmr-calculator

tdee-calculator

calorie-calculator

macro-calculator

calorie-deficit-calculator

body-fat-calculator

ideal-weight-calculator

lean-body-mass-calculator

water-intake-calculator

protein-intake-calculator

Width & height from any aspect ratio

Add and subtract HH:MM:SS durations

Three modes, one tool

Days between dates

Measure any space

Celsius, Fahrenheit, Kelvin

Custom random numbers

Calculate exact age in years, months, and days

Calculate fuel consumption in L/100km or MPG with cost estimate

Compare the cost of driving an electric vehicle vs gasoline per trip, monthly, and annually

Calculate weighted GPA on 4.0 or 4.3 scale with letter grades and credits

Convert units across 6 categories: length, weight, volume, area, speed, and data

Convert times between 19 world timezones with DST support

Count words, characters, sentences, and reading time

Test your typing speed and accuracy

Social media platform limits

Instant placeholder text

reading-time-calculator

speech-time-calculator

Generate strong, secure passwords

Pick colors and convert HEX, RGB, HSL

Decimal, binary, hex, octal

Create QR codes instantly

Format, validate, and minify JSON with syntax error detection

Generate cryptographic hashes from any text using Web Crypto API

Check password strength with score, crack time estimate, and criteria checklist

Compare two texts line by line and highlight additions and deletions

Generate 5-color palettes using complementary, analogous, triadic, split, or monochromatic harmony

KB, MB, GB, TB and KiB, MiB, GiB, TiB

Live ECMAScript regex tester with match highlighting and replace mode

Two-way Base64 with URL-safe mode and UTF-8 support

Encode/decode URLs with encodeURIComponent vs encodeURI and a URL parser

Generate UUID v4 and v7 identifiers in bulk

Decode JWT header, payload, claims, and verify HS256 signatures

Convert text to camelCase, snake_case, kebab-case, and 11 more

Visual UNIX cron editor with human-readable description and next-5-runs preview

Live generator for gradients, shadows, filters, transforms. 7 presets (Glassmorphism, Neumorphism, Retro, Brutalist, Soft, Neon, Cyberpunk). Copy as CSS, inline, or Tailwind arbitrary values. Share URL.

unix-timestamp-converter

color-contrast-checker

slug-generator

markdown-table-generator

Convert ppm to mg/m³ and back, with adjustable temperature and pressure. Standard ACGIH conditions by default (25 °C, 1 atm).

Compute time-weighted average concentrations across multiple samples. Three modes: measured period, full 8 h with zero residual, or 8 h with constant residual.

Convert between pressure (Pa, kPa, atm, psi, in H₂O, mm Hg…), flow (cfm, scfm, m³/h, L/min), air velocity (fpm, m/s) and aerosol concentrations.

Add sound levels logarithmically: L_total = 10·log10(Σ 10^(L_i/10)). Works for dBA, dBC and linear dB.

Compute sound levels at a target distance for point sources (-6 dB per doubling) or line sources (-3 dB per doubling) under free-field assumptions.

Compute volumetric flow rate from air velocity and duct cross-section. Round, rectangular, or direct area input. Output in m³/s, m³/h and cfm.

Compute ACH from airflow and room volume, or required airflow from a target ACH. SI and imperial units supported.

Check exposure peaks against STEL/VECD or the ACGIH default excursion rule (3× / 5× of the TWA). Ceiling check optional.

Compute the WBGT index for indoor (no solar load) or outdoor (with solar load) conditions. Output in °C, °F and K.

Estimate effective sound level at the eardrum from NRR using the CCOHS Canadian method (50% / 70% / 65% derating). Single or dual protection.

Convert between velocity pressure (in H₂O, Pa) and air velocity (fpm, m/s) with optional density correction for non-standard temperature and pressure.

Compute cumulative noise dose and equivalent 8-hour TWA using NIOSH (3 dB / 85 dBA), OSHA (5 dB / 90 dBA), or Quebec RSST (3 dB / 85 dBA, since June 2023).

Compute the intensity at a target distance from a point source: I₂/I₁ = (d₁/d₂)². Useful for radiation dose-rate estimates in free space.

Convert cooking units: cups, oz, grams, ml

Flip coins and roll dice with animations

Shuffle any list using the Fisher-Yates algorithm

Fun voice control game for kids with five animal levels and streak tracking

decision-wheel

bpm-tap-tester

final-grade-calculator

test-score-calculator

class-grade-calculator

reading-level-calculator

Calculate water, salt, and yeast by baker's percentages for any pizza style

Calculate flour, water, levain, and salt with starter-adjusted baker's percentages

Scale any recipe by servings — multiply every ingredient by a factor

Calculate coffee and water amounts for V60, AeroPress, French Press, Espresso, and Cold Brew

Convert between fresh, active dry, and instant yeast quantities