Online Calculators · Instant & Free

Fixed Deposit Interest Calculator – Lump Sum & Monthly Savings

Calculate fixed deposit interest for lump-sum or monthly savings plans. Enter principal, term (3 months to 5 years), and annual interest rate to instantly compute maturity interest and total payout. Ideal for comparing bank deposit returns.

Credit Card Installment Calculator · Monthly Fee → Real APR · Newton IRR

Credit card installments often advertise a 0.6%/mo fee, implying ~7% a year — but the true APR is ~13.5%. This tool solves IRR via Newton's method to compute the real APR, plus monthly payment, total fee, and nominal-vs-real comparison. Supports monthly fee rate or total fee rate input.

Housing Fund Loan Calculator · Commercial / Fund / Combined Comparison

Compare three housing loan plans side by side — commercial only, fund only, combined — with monthly payment, total interest and total payment. Default fund rate 3.1% (first home, 5y+), commercial rate 4.5%. Runs locally.

Mortgage Calculator · Equal Payment & Equal Principal

Free mortgage calculator supporting equal payment and equal principal repayment. Instantly see monthly payment, total interest, total repayment and full amortization schedule.

Mortgage Prepayment Calculator · Shorten Term vs Reduce Payment

Enter your existing mortgage and a one-off extra payment to instantly compare the two mainstream plans — shorten the loan term or reduce the monthly payment — with new payment, remaining months, interest saved and months paid off early. Runs locally in your browser.

2026 Personal Income Tax Annual Settlement Calculator

Calculate your 2026 personal income tax annual settlement with comprehensive income and special additional deductions support to accurately determine tax payable or refundable amount

2026 Pension Adjustment Simulator · Flat + Service + Level-linked + Age Bonus

Enter monthly pension, service years, retirement age, and province to simulate the 2026 pension adjustment — flat ¥46, tiered service-year bonus (¥1.0–2.5/year), level-linked ratio (1.0–1.5% by province), and senior bonus (¥40–100 from age 65). Fully browser-local.

Social Security & Housing Fund Calculator · 6 Major China Cities

Enter pre-tax monthly salary and city (Beijing / Shanghai / Shenzhen / Guangzhou / Hangzhou / Chengdu / generic) to instantly get personal and employer contributions for all 5 insurances and housing fund, with base cap/floor auto-clamped. Aligned with 2024 SHRSS windows. Runs locally in your browser.

2025 Individual Income Tax Calculator (China) · Cumulative Withholding

Calculate your monthly China personal income tax under the 2025 comprehensive-income cumulative-withholding method. Supports salary, social insurance, itemized deductions and start month, with a monthly schedule.

Year-End Bonus Tax Calculator · Separate vs Combined Comparison

Enter monthly salary, insurance, special deductions and annual bonus to instantly compare two tax methods — separate taxation vs combining into comprehensive income — across annual tax, effective rate, and net income. Policy aligned with China's 2023 extension through 2027. Runs locally in your browser.

Baby Growth Percentile Calculator (WHO & China WS/T 423 Standards)

Calculate baby height, weight, head circumference and BMI percentiles using WHO LMS standards (0-60 months). Supports China WS/T 423-2022 reference data and preterm corrected age. Tracks growth for boys and girls aged 0-5 years.

BMR & TDEE Calculator · Mifflin-St Jeor + Harris-Benedict · 5 Activity Levels

Enter gender, age, height, weight to get Basal Metabolic Rate (BMR) instantly and TDEE across 5 activity levels, plus cut / maintain / bulk calorie targets. Switch between Mifflin-St Jeor (recommended) and Harris-Benedict formulas. Fully local.

Pregnancy Due Date Calculator · Gestational Age & Trimester

Enter your LMP (last menstrual period) to instantly get due date (Naegele's rule · LMP + 280 days), current gestational age (w+d), trimester (1st/2nd/3rd), countdown, and estimated conception date. Non-28-day cycles auto-adjusted. All local.

BMI Calculator · Body Mass Index with Healthy Weight Range

Instantly compute your Body Mass Index (BMI) from height and weight, switch between metric/imperial, compare WHO international vs Chinese (WS/T 428) Asian-population categories and see your healthy weight range. Runs entirely in your browser.

English Level Converter · CEFR ↔ CET / IELTS / TOEFL / PTE

Enter a score, get CEFR level (A1-C2) instantly plus cross-reference for CET / IELTS / TOEFL / PTE. Based on British Council, ETS, Cambridge Assessment official mapping. Essential for grad apps, CVs, job hunting.

GPA Calculator · 4.0 / 4.3 / 4.5 / 5.0 Scales · Weighted & Arithmetic

Required for grad-school apps, scholarships. Enter scores & credits once; see GPA across 5 scales (US 4.0, 4.0-improved, 4.3, 4.5, Tsinghua 5.0 capped at 4.8) with weighted & arithmetic modes. Formulas per WES & CSCSE.

Electricity Bill Calculator – Tiered & Time-of-Use Rates

Calculate China residential electricity bills using tiered or time-of-use pricing. Select your province, enter monthly usage or peak/valley/flat hours, and instantly see a tier-by-tier cost breakdown plus total bill. Covers monthly and annual billing for individual and shared meters.

2026 EV Purchase Subsidy & Total Cost Calculator – Out-the-door Price

Estimate your 2026 EV out-the-door price in seconds: combine the renewed purchase-tax exemption, trade-in subsidy, local incentives and dealer discount into one transparent figure. Runs locally in your browser; no data uploaded.

China Oil Price Adjustment Countdown & Refuel Savings Calculator

Count down China's next fuel price adjustment window based on the NDRC 10-working-day cycle. Combine tank capacity, remaining fuel and expected change to decide whether to fill up now or wait. Supports 92/95/98 gasoline and 0# diesel.

Renovation Material Calculator – Tiles, Paint, Flooring & Baseboards

Calculate tiles, paint buckets, floor planks and baseboard length for your renovation. Enter room dimensions and get accurate quantities with industry-standard waste rates to control your purchasing budget.

2026 FIFA World Cup Group Stage Points & Qualification Calculator

Enter scores for the 2026 FIFA World Cup 48-team, 12-group stage. Auto-calculates points, goal difference, head-to-head tiebreakers and the 8 best third-placed cross-group rankings to project Round-of-32 qualification.

Interest Calculator · Simple / Compound / SIP · With Effective Annual Rate

Three modes in one · simple / compound (annual/quarterly/monthly/daily) / SIP (monthly contributions). Outputs total, interest, effective annual rate, and year-by-year breakdown. Formulas per PBoC & Investopedia. All local.

Age Calculator · Years, Months, Days, Next Birthday

Enter a birth date to instantly compute exact age in years/months/days, Chinese nominal age, total days/hours lived, days to next birthday and zodiac sign. All computed locally.

Unit Converter · Length, Mass and Temperature

Online conversion across length (m/cm/mm/km/in/ft/yd/mi), mass (kg/g/t/lb/oz) and temperature (°C/°F/K). Enter a value to see the full matrix across all units in the same category. Runs locally in your browser.

Color Converter · HEX RGB HSL Three-way Conversion

Online color format converter for HEX / RGB / HSL. Type any format, the other two sync instantly with live swatch preview. Runs entirely in your browser — nothing uploaded.

JSON Formatter · Prettify · Minify · Validate

Online JSON formatter / minifier / validator with custom indent, lag-free large inputs, and structured error messages. Runs entirely in your browser — JSON never uploaded, safe for sensitive data.

LLM API Inference Cost Calculator – GPT, Claude, Gemini, DeepSeek

Estimate API costs for GPT, Claude, Gemini, DeepSeek and Qwen LLMs with input/output token pricing, prompt caching discounts and USD-CNY conversion. Forecast daily, monthly and yearly bills to plan your AI product budget with confidence.

2026 May Day Overtime Pay Calculator – Daily Rate Checker

Locked to China's 2026 May Day holiday (May 1–5). Check each day you worked overtime to instantly see per-day and total pay at the correct multiplier: 3× for statutory holidays (May 1–2) and 2× for compensatory rest days (May 3–5). Salary folded locally in your browser — no data uploaded.

Provident Fund Withdrawal Calculator: 7 Cities, 6 Scenarios

Check housing provident fund withdrawal limits for Beijing, Shanghai, Guangzhou, Shenzhen and 3 more cities. Covers 6 withdrawal scenarios — home purchase, loan repayment, rental, resignation, serious illness and retirement — with required materials and frequency rules.

QR Code Generator - Online Free Local Browser Tool

Free online QR code generator for text, URLs, WiFi and vCard. Customize error correction level, size and colors, then download as PNG. All processing happens locally in your browser, no upload.