Subscription pricing
Free
- 3 free calculators
- No account needed
- No payment required
Premium All-Access
Provisional test price — not yet approved for sale.
- All published premium calculators
- PDF calculation reports
- Valid for one calendar month from successful payment
- Card: renews monthly, cancel anytime
- PayNow / WeChat Pay / Alipay: manual renewal
Individual Calculator
Provisional test price — not yet approved for sale.
- One premium calculator for one month
- Not yet available
Subscribe to Premium All-Access
S$19.90 per month. Cards renew automatically each month until you cancel in My Account; you keep access until the end of the paid period. PayNow, WeChat Pay and Alipay are one-off payments for one calendar month with manual renewal — we remind you 7 days and 1 day before expiry.
Before paying, please read the Subscription Terms, Cancellation Policy & Refund Policy.
Online payment is not yet activated. Contact us if you would like early access.
Frequently asked questions
When does access start?
As soon as the payment gateway confirms a successful payment. Access lasts one calendar month from that payment.
Which payment methods can I use?
Only methods that are activated are shown: cards (Visa, Mastercard; American Express subject to merchant eligibility), PayNow, WeChat Pay and Alipay.
Do you store my card?
No. Card details are handled entirely by the payment provider's secure hosted checkout.
What happens if a renewal fails?
Your subscription is marked past due and we email you a link to update your payment method. Premium access stops when the paid period ends.