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901 free calculators, converters and checkers — built for SG, MY and the region, reviewed with current figures. No accounts, no paywalls.

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901 tools live 29 categories Reviewed Jun 2026
Category
All (901) Browse A–Z Finance & Money (185) AI Tools (79) Chinese Culture & Almanac (70) Fun & Misc (51) Mathematics (49) Developer Tools (45)
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Finance & Money · 0 tools Browse all →
BRRRR Calculator (Buy-Rehab-Rent-Refinance-Repeat)

Buy-Rehab-Rent-Refi-Repeat strategy
Loan EMI Calculator

Calculate loan EMI and total interest
GST / Tax Calculator

Calculate GST/VAT for SG, MY, ID, TH

Reviewed Jun 2026
Developer Tools · 0 tools Browse all →
Cron Expression Builder

Build, describe, and test crontab schedules
Crontab Generator

Build and validate cron expressions with a visual editor and next-5-runs preview.
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Fun & Misc · 0 tools Browse all →
Team Generator

Randomly split people into teams
Cybersecurity Tools · 0 tools Browse all →
IPv4 Subnet Calculator

CIDR + mask + broadcast + usable hosts + RFC 1918 detection
Science · 0 tools Browse all →
Ideal Gas Law Calculator

PV = nRT — solve for pressure, volume, moles or temperature · 3 curricula
Mathematics · 0 tools Browse all →
Combinations & Permutations Calculator

nCr, nPr and factorials for counting
Chinese Language & Script · 0 tools Browse all →
Kangxi Radical Reference (康熙部首查询)

214 Kangxi radicals grouped by stroke count
Chinese Vertical Text Layout (中文竖排排版)

Top-to-bottom, right-to-left classical layout + print
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