Ohmlark Pro
The calculators are free: no ads, no tracking, no sign-up. Pro costs your whole BOM and sums battery life across every part.
Free
$0 forever
- ✓No ads, no tracking, no sign-up — that's the promise
- ✓All 9 calculators, free forever
- ✓Copy any result or share it as a link
- ✓Reverse lookups & E-series rounding
- ✓Works on your phone at the bench
Pro Monthly
$4 per month, cancel anytime
- ✓Everything in Free
- ✓Whole-device BOM cost: per board and per batch
- ✓Battery-life summary from every part's active & sleep current
- ✓Unlimited BOM rows and paste-import from a spreadsheet
- ✓PDF & CSV export of any result
- ✓Saved projects (kept in this browser; export CSV to back up)
Best value
Pro Lifetime
$29 one-time payment
- ✓Everything in Free
- ✓Whole-device BOM cost: per board and per batch
- ✓Battery-life summary from every part's active & sleep current
- ✓Unlimited BOM rows and paste-import from a spreadsheet
- ✓PDF & CSV export of any result
- ✓Saved projects (kept in this browser; export CSV to back up)
- ✓All future calculators included
Prices in USD. Taxes may apply and are calculated at checkout by Creem, our Merchant of Record. 14-day refund on first purchase — see refund policy. Already paid? Restore purchase.