Tools tagged "calculator"

Enter a birth date and a reference date to get the full age in years, days lived, Eastern zodiac (12 animals), and Western zodiac. Change the reference date to compute the age at any past or future point. Everything runs inside your browser — your birthday never leaves the page.

Type a start date (relationship, wedding, business launch, fan-club anniversary) and instantly see the elapsed time as 『Y years M months D days』, weeks, days, hours, minutes, and seconds. Upcoming milestones (100, 200, 1000 days, 1/5/10 year marks…) are computed with their own countdowns. Updates every second; copy any value in one click. Where age-calc is birthday-specific, this tool fits any anniversary. Everything runs in your browser.

Calculate your Body Mass Index from height and weight, with the classification under either the Japan Society for the Study of Obesity (JASSO) standard or the WHO standard. The result includes the ideal weight (BMI 22), the healthy weight range (BMI 18.5–25), and the difference from the ideal. Toggle the standard with a Mode, and the unit system between metric (cm / kg) and imperial (inch / lb) with an Option. Live computation as you type — everything stays inside your browser.

Compute the date that is N business days before or after a given date, skipping Chinese public holidays (New Year, Spring Festival, Qingming, Labour Day, Dragon Boat, Mid-Autumn, National Day) and weekends. Honours 调休 (makeup work-days) — weekends officially designated as working days to bridge long holidays. Data follows the State Council's published 2024 and 2025 schedules; 2026 is an approximation pending official notice. Runs entirely in your browser.

Compute the date that is N business days before or after a given date, skipping Japanese national holidays plus weekends. Handles substitute holidays, citizen's holidays, and vernal/autumnal equinoxes (1955-2099). Useful for due dates, settlement dates, and Japan-side delivery scheduling. Runs entirely in your browser.

Compute the date that is N business days before or after a given date, skipping the 11 US federal holidays (New Year's, MLK Day, Presidents' Day, Memorial Day, Juneteenth, Independence Day, Labor Day, Columbus Day, Veterans Day, Thanksgiving, Christmas) and weekends. Saturday-fall holidays observed Friday and Sunday-fall observed Monday, per federal employee rules. Juneteenth recognised from 2021; MLK Day from 1986. Runs entirely in your browser.

Estimate the 20.315% Japanese tax on listed-stock and mutual-fund capital gains (income tax 15% + 0.315% reconstruction surtax + 5% resident tax). Enter sale proceeds, acquisition cost (incl. buy-side fees) and sell-side expenses; the tool returns the gain, each tax line and the after-tax take-home. Losses display zero tax and a note about the 3-year carry-over deduction. Excludes NISA / iDeCo tax-free balances. Runs entirely in your browser — your figures never leave the device.

Cross-reference clothing sizes across Letter (XS / S / M / L / XL / XXL / 3XL), Japan (号 or cm), US, UK and EU. Switch between four charts (Men × Women × Tops × Bottoms) — tops use chest, bottoms use waist, both shown with the body measurement in cm. Useful when shopping at Amazon US / ASOS / H&M / Marks & Spencer from Japan or vice versa. Type a value to highlight the matching row. Tables are a composite of UNIQLO / MUJI / Marks & Spencer / H&M, with the usual 0.5–1 size brand variation (see FAQ). Runs entirely in your browser — no uploads.

Project the future value of an investment compounded over time. Supports three modes: principal only, monthly contributions, or annual contributions. Great for simulating Tsumitate NISA / iDeCo / certificates of deposit. Year-by-year balances can be exported as CSV. Principal, rate, and term stay in your browser — nothing is uploaded.

Free online Japanese consumption tax (shōhizei) calculator. Convert net ↔ gross both ways at the 10% standard rate, 8% reduced rate, or a custom rate, and see net, tax, and gross amounts together. Selectable rounding (floor / round / ceiling). Runs entirely in your browser — no amounts are uploaded.

Pin multiple upcoming events (exams, trips, project deadlines, anniversaries, concerts…) onto a single board and watch each remaining time tick down side by side. Each entry takes just a name plus a date-time, and the whole board is auto-saved to your browser's localStorage so it survives reloads. The countdown (DDd HH:MM:SS) updates every second and flips to '—' once the deadline passes. Holds up to 50 entries. Runs entirely in your browser — nothing is uploaded.

Apply multiple coupons (% off, flat amount off, point rebate, sales tax) to a list price in a specific sequence and see how the final total moves. E-commerce checkouts and brick-and-mortar registers don't always apply coupons in the same order, and the answer differs depending on the sequence. Reorder the coupons to see step-by-step totals at every stage, then compare orderings to **find the cheapest** and **most expensive** sequence automatically. Pairs nicely with `discount-calc` (stacking two %-off rates) when you need richer behaviour: 5+ coupons, tax-before vs. tax-after, point rebates with their own basis. Nothing is uploaded — math runs in your browser.

Simulate Japanese credit-card revolving (リボ払い) repayments month-by-month from the current balance, fixed monthly payment, and APR. Visualize months-to-payoff, total interest paid, and the principal vs interest split over time. Supports three Japanese-style methods: balance-slide (残高スライド), equal-payment (元利定額), and equal-principal (元金定額). Most card issuers charge 15.0–18.0% APR — keeping the minimum payment low usually grows the balance instead of paying it down, so the tool also lets you compare an extra-payment scenario. Nothing leaves your browser.

Compute the gap between two dates in days, weeks, business days, a years-months-days breakdown, and (optionally) hours/minutes/seconds. Toggle inclusivity and time-of-day with a checkbox. Everything runs inside your browser.

Compute sale prices, discount amounts, and discount rates in four modes: (1) list price + discount% → savings + final price, (2) list price + sale price → effective discount %, (3) list price + discount amount → discount %, (4) list price + discount1 + discount2 → final price after stacking (e.g. 30% off + extra 10% = 1 − 0.7 × 0.9 = 37% off). Each mode also displays tax-included / tax-excluded values (10% / 8% / custom). Useful for shoppers comparing deals and store owners pricing inventory. Runs entirely in your browser.

Calculate how much each person owes when splitting a bill. Enter the total and the number of people, choose a rounding unit (1 / 10 / 100 / 500 / 1000), and see the per-person amount instantly. Two modes: (1) 『Even』 — everyone pays the same rounded-up amount, and one person gets a discount on the difference; (2) 『Organizer』 — most pay the rounded-down amount, and the organizer covers the leftover. The reconstructed total and the difference are shown live. Everything runs in your browser.

From your last meal time and a chosen fasting protocol — 12:12, 14:10, 16:8, 18:6, 20:4 (Warrior), 23:1 (OMAD), 36h extended, or custom — the tool shows when the fast ends and the next eating window opens / closes. A 24-hour heat-map visualises 'fasting' vs 'eating' hours. Built for Leangains, OMAD, and 5:2 practitioners.

Convert between fractions (3/4, 1 1/2 mixed numbers) and decimals (0.75, 1.5, repeating decimals like 0.(3)). Finite decimals become exact reduced fractions; in approx mode, continued fractions yield approximations like π → 355/113; fraction → decimal recovers the repeating block with `()` notation. Handy for cooking recipes, imperial ↔ metric, and probability notation.

Lays out monthly income, expenses, fixed costs, and every tax due date (income tax prepayments, resident tax 4 instalments, NHI 8 instalments, business tax, consumption tax mid-year) on a per-month calendar for Japanese sole proprietors. Shows how much you can put toward investments or savings each month, refunds included. Runs entirely in your browser.

Builds a per-month calendar of this year's tax due dates and amounts (resident 4×, NHI 8×, business tax, income-tax prepay 2×, consumption mid-year) directly from your prior-year return (business income, taxable income, final income tax, consumption tax). Add this year's income, expenses, and fixed costs to see how much cash is left each month. Runs entirely in your browser.