Four calculators in one place: RPM and feed rate, thrust force and torque, cycle time, and tap drill size. Everything you need for a drilling job, no login, no nonsense.
N = (1000 × Vc) / (π × D)Vf = N × fN = (12 × SFM) / (π × D)F = 0.5 × Kc × f × DMd = (Kc × f × D²) / 8000Pc = (Md × N × 2π) / 60000Vf = N × fA = D / (2 × tan 59°)T = (L + A) / VfT_total = T × number of holes| Drill Size | Calculated Dia. | Clearance | Best For |
|---|
d = D - pd = D - (E% / 100) × pd = D - 1/TPIWhy I built this calculator? Honestly, because I was tired of searching for these numbers mid-job and landing on pages that wanted me to sign up, download a PDF, or sit through an ad that auto-played at full volume.
Drilling sounds simple until you break a tap at 2 AM in a workshop with no replacement and no idea where you went wrong. Getting the drill size right, the feed right, the RPM right: these small things decide whether the job goes smoothly or you're calling the supplier in the morning.
Whether you're a diploma student doing your first workshop practical, a machinist at a small job shop, or someone prepping for competitive exams, you deserve the same quality tools as anyone else. No account needed. Works on your phone in the workshop.
If something is wrong in the calculations or you want a material added to the presets, just let me know. I'd rather fix it than have someone make a mistake because of a bad calculator.